A multi-functional control circuit inside a chip

Abstract

The application provides a multi-function control circuit inside a chip, comprising a current module, a shutdown module and a state control module, wherein the current module is connected with the shutdown module and the state control module through a pin A; the shutdown module is configured to output a first control signal when the voltage of the pin A is less than a first voltage V1, so that the chip enters a shutdown mode, and output a second control signal when the voltage of the pin A is greater than the first voltage V1; the state control module is configured to make the chip enter a standby mode when the shutdown module outputs the second control signal, the voltage of the pin A is greater than the first voltage V1 and less than a second voltage V2, make the chip enter a soft start mode when the shutdown module outputs the second control signal and the voltage of the pin A is greater than the second voltage V2, and make the chip enter a normal operation mode after the soft start mode ends. The application realizes precise switching of multiple modes of shutdown, standby, soft start and normal operation through a single pin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chip control, and particularly relates to a multi-functional control circuit inside a chip. BACKGROUND

[0002] In the prior art, a control chip usually has multiple working modes, such as shutdown, standby, soft start and normal operation. In order to realize these different working modes, the existing control chip generally receives different voltage signals through multiple external pins to control the respective corresponding function modules. For example, some chips realize the switching between the shutdown and standby modes by controlling the voltage of pin 1, realize the triggering of the soft start process by controlling the voltage of pin 2, and realize the control of entering the normal operation state by controlling the voltage of pin 3. However, since each mode needs to be controlled by an independent pin, this design not only increases the number of pins of the chip, but also increases the complexity of the peripheral circuit and occupies a large chip area. This structure is not conducive to the improvement of the integration of the chip, and it is also difficult to meet the development trend of the current electronic equipment towards miniaturization and integration. SUMMARY

[0003] The present application aims to provide a multi-functional control circuit inside a chip to realize the unified control of multiple working modes of the chip through a single pin, thereby simplifying the pin design and reducing the chip area.

[0004] According to a first aspect of the present application, a multi-functional control circuit inside a chip is provided, comprising a current module, a shutdown module and a state control module, wherein the current module is connected with the shutdown module and the state control module through a pin A.

[0005] The shutdown module is configured to output a first control signal when the voltage of the pin A is less than a first voltage V1, so that the chip enters a shutdown mode, and output a second control signal when the voltage of the pin A is greater than the first voltage V1.

[0006] The state control module is configured to make the chip enter a standby mode when the shutdown module outputs the second control signal and the voltage of the pin A is greater than the first voltage V1 and less than a second voltage V2, control the chip to enter a soft start mode when the shutdown module outputs the second control signal and the voltage of the pin A is greater than the second voltage V2, and make the chip enter a normal operation mode after the soft start mode ends.

[0007] Optionally, in the state control module, the power supply voltage VCC is sequentially grounded through a first transistor Q1, a first resistor R1 and a first controllable current source G1, a base of the first transistor Q1 is connected to the pin A, positive and negative control ends of the first controllable current source G1 are both connected to the current module; the power supply voltage is also sequentially grounded through a second controllable current source G2 and a first switch tube M1, a control end of the first switch tube M1 is connected to a first node B between the first resistor R1 and the first controllable current source G1, positive and negative control ends of the second controllable current source G2 are both connected to the current module.

[0008] The state control module comprises a first capacitor C1, a first end of the first capacitor C1 is connected to the pin A, and a second end of the first capacitor C1 is grounded.

[0009] The state control module further comprises a voltage regulation unit, the voltage regulation unit is connected to a second node C between the second controllable current source G2 and the first switch tube M1, an output end of the voltage regulation unit is connected to an external power circuit of a chip, and the voltage regulation unit is configured to regulate a voltage of the second node C in the soft start mode, until the voltage of the second node C is stabilized at a first preset value, so that the soft start mode ends.

[0010] Optionally, the state control module further comprises:

[0011] a second switch tube M2, a current input end of the second switch tube M2 is connected to the second node C, a current output end of the second switch tube M2 is grounded, and a control end of the second switch tube M2 is connected to a reference voltage VR;

[0012] The first preset value is a sum of a voltage difference VGS and the reference voltage VR, and the voltage difference VGS is a voltage difference value between the control end and the current input end of the second switch tube M2.

[0013] Optionally, in the voltage regulation unit, the power supply voltage VCC is sequentially grounded through a second resistor R2, a third switch tube M3 and a third controllable current source G3, and a control end of the third switch tube M3 is connected to the second node C.

[0014] The power supply voltage VCC is also sequentially grounded through a third resistor R3, a fourth switch tube M4 and the third controllable current source G3, and positive and negative control ends of the third controllable current source G3 are both connected to the current module.

[0015] The power supply voltage VCC further sequentially passes through a fourth controllable current source G4 and a fifth switch tube M5 to ground, a control end of the fifth switch tube M5 is connected to a voltage VS, the voltage VS is an output detection voltage of a chip external power circuit, and a size of the voltage VS is proportional to an output current or voltage of the chip external power circuit; a control end of the fourth switch tube M4 is connected to a third node D between the fourth controllable current source G4 and the fifth switch tube M5, and both a positive control end and a negative control end of the fourth controllable current source G4 are connected to the current module;

[0016] The power supply voltage VCC further sequentially passes through a fifth controllable current source G5 and a fourth resistor R4 to ground, a positive control end of the fifth controllable current source is connected to the power supply voltage VCC, and a negative control end of the fifth controllable current source is connected to a current input end of the fourth switch tube M4;

[0017] The power supply voltage VCC further sequentially passes through a sixth controllable current source G6 and a seventh controllable current source G7 to ground, a positive control end of the sixth controllable current source G6 is connected to the power supply voltage VCC, a negative control end of the sixth controllable current source G6 is connected to a current input end of the third switch tube M3, a positive control end of the seventh controllable current source G7 is connected to a first end of the fourth resistor R4, and a negative control end of the seventh controllable current source G7 is connected to a second end of the fourth resistor R4;

[0018] A fourth node E between the sixth controllable current source G6 and the seventh controllable current source G7 serves as an output end of the voltage regulation unit.

[0019] Optionally, the second resistor R2 and the third resistor R3 have the same resistance, current coefficients of the fifth controllable current source G5, the sixth controllable current source G6 and the seventh controllable current source G7 are equal, and parameters of the first switch tube M1, the second switch tube M2 and the fifth switch tube M5 are the same.

[0020] Optionally, in the current module, the power supply voltage VCC sequentially passes through a fifth resistor R5 and a first current source B1 to ground;

[0021] The power supply voltage VCC further sequentially passes through an eighth controllable current source G8, a second triode Q2 and a sixth resistor R6 to ground, a positive control end of the eighth controllable current source G8 is connected to a first end of the fifth resistor R5, and a negative control end of the eighth controllable current source G8 is connected to a second end of the fifth resistor R5;

[0022] The power supply voltage VCC further sequentially passes through a ninth controllable current source G9, a third transistor Q3 and a seventh resistor R7 to ground, a positive control end of the ninth controllable current source G9 is connected to a first end of the fifth resistor R5, a negative control end of the ninth controllable current source G9 is connected to a second end of the fifth resistor R5, a base of the third transistor Q3 is connected to a base of the second transistor Q2, and the base of the third transistor Q3 is also connected to a collector of the third transistor Q3.

[0023] The power supply voltage VCC further sequentially passes through an eighth resistor R8, a sixth switch tube M6 and a seventh resistor R7 to ground, and a control end of the sixth switch tube M6 is connected to a collector of the second transistor Q2.

[0024] Optionally, a number ratio of the second transistor Q2 to the third transistor Q3 is 1:N, where N is greater than 1, current coefficients of the eighth controllable current source G8 and the ninth controllable current source G9 are equal, and a resistance value of the sixth resistor R6 is the same as that of the seventh resistor R7.

[0025] Optionally, in the current module, the power supply voltage VCC further sequentially passes through a tenth controllable current source G10 and a ninth resistor R9 to ground, a positive control end of the tenth controllable current source G10 is connected to a first end of the eighth resistor R8, and a negative control end of the tenth controllable current source G10 is connected to a second end of the eighth resistor R8.

[0026] The power supply voltage VCC further sequentially passes through a tenth resistor R10 and an eleventh controllable current source G11 to ground, a positive control end of the eleventh controllable current source G11 is connected to a first end of the ninth resistor R9, a negative control end of the eleventh controllable current source G11 is connected to a second end of the ninth resistor R9, the positive control end of the eleventh controllable current source G11 is connected to a positive control end of the first controllable current source G1 and a positive control end of the third controllable current source G3, and the negative control end of the eleventh controllable current source G11 is connected to a negative control end of the first controllable current source G1 and a negative control end of the third controllable current source G3.

[0027] The power supply voltage VCC further passes through a twelfth controllable current source G12 to the pin A, a positive control end of the twelfth controllable current source G12 is connected to a first end of the tenth resistor R10, a negative control end of the twelfth controllable current source G12 is connected to a second end of the tenth resistor R10, the positive control end of the twelfth controllable current source G12 is connected to a positive control end of the second controllable current source G2 and a positive control end of the fourth controllable current source G4, and the negative control end of the twelfth controllable current source G12 is connected to a negative control end of the second controllable current source G2 and a negative control end of the fourth controllable current source G4.

[0028] Optionally, the current coefficients of the first controllable current source G1, the tenth controllable current source G10, the eleventh controllable current source G11 and the twelfth controllable current source G12 are all 1.

[0029] Optionally, the formula of the second voltage V2 is:

[0030] ;

[0031] wherein VBE1 is the voltage difference between the base and the emitter of the first triode Q1.

[0032] Optionally, in the shutdown module, the power supply voltage VCC is grounded through a thirteenth controllable current source G13, a seventh switch tube M7 and an eleventh resistor R11 in sequence, the positive control end of the thirteenth controllable current source G13 is connected to the first end of the tenth resistor R10, the negative control end of the thirteenth controllable current source G13 is connected to the second end of the tenth resistor R10, and the control end of the seventh switch tube M7 is connected to the pin A.

[0033] The power supply voltage VCC is also grounded through a thirteenth controllable current source G13, an eighth switch tube M8 and a twelfth resistor R12 in sequence, and the control end of the eighth switch tube M8 is connected to the first voltage V1.

[0034] The power supply voltage VCC is also grounded through a thirteenth resistor R13 and a fourteenth controllable current source G14 in sequence, the positive control end of the fourteenth controllable current source G14 is connected to the first end of the twelfth resistor R12, and the negative control end of the fourteenth controllable current source G14 is connected to the second end of the twelfth resistor R12.

[0035] The power supply voltage VCC is also grounded through a fifteenth controllable current source G15 and a sixteenth controllable current source G16 in sequence, the positive control end of the fifteenth controllable current source G15 is connected to the first end of the thirteenth resistor R13, the negative control end of the fifteenth controllable current source G15 is connected to the second end of the thirteenth resistor R13, the positive control end of the sixteenth controllable current source G16 is connected to the first end of the eleventh resistor R11, and the negative control end of the sixteenth controllable current source G16 is connected to the second end of the eleventh resistor R11.

[0036] A fifth node F between the fifteenth controllable current source G15 and the sixteenth controllable current source G16 serves as an output end of the shutdown module.

[0037] Optionally, the current coefficients of the fourteenth controllable current source G14, the fifteenth controllable current source G15 and the sixteenth controllable current source G16 are equal.

[0038] According to the scheme of the present application, by integrating multiple functional modules inside the chip and combining the voltage change of a single pin to control different working states of the chip, precise switching of multiple modes such as shutdown, standby, soft start and normal operation can be realized, avoiding the structure design of multiple-pin dispersed control in the traditional scheme, significantly simplifying the chip peripheral circuit, reducing the circuit complexity, thereby effectively reducing the chip size and improving the system integration. At the same time, the multi-functional control circuit inside the chip provided by the present application, through a single state control module, not only realizes the control of the circuit soft start, but also has the adjustment ability of steady-state output after the circuit enters the normal working state, improving the utilization efficiency of the module and the overall control performance.

[0039] Further, by reasonably designing the key circuit parameters, the second voltage V2 has zero temperature drift characteristic, effectively offsetting the influence of temperature change on circuit operation. This design not only improves the stability of the control logic, prevents false action or logic disorder caused by the second voltage V2 being lower than the first voltage V1 due to temperature drift, but also ensures that the chip can maintain consistent startup behavior in the full temperature range, thereby significantly enhancing the reliability and environmental adaptability of the system.

[0040] Further, by reasonably configuring the key current sources, resistors and switching devices in each module, the stable output and temperature drift suppression of the control signal are effectively guaranteed, and the consistency and reliability of the chip in different temperature environments are enhanced. At the same time, the control circuit simplifies the peripheral circuit configuration, reduces the system complexity, effectively reduces the chip size, and improves the integration level and engineering applicability of the overall system.

[0041] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application and can be implemented according to the content of the specification, the following will be described in detail with the preferred embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The structure schematic diagram of the multi-functional control circuit inside the chip according to an embodiment of the present application is shown;

[0043] Figure 2 The circuit topological graph of the current module 100 and the state control module 300 according to an embodiment of the present application is shown;

[0044] Figure 3 The circuit topological graph of the shutdown module 200 according to an embodiment of the present application is shown. Figure 2 The waveform diagram of the voltage VC of the second node C changing with time after the first triode Q1 is turned on in the circuit shown in FIG. 6 is shown;

[0045] Figure 4 The circuit topological graph of the shutdown module 200 according to an embodiment of the present application is shown. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0047] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] Figure 1 A schematic diagram of a multi-functional control circuit inside a chip according to an embodiment of the present invention is shown. Figure 1 As shown, the internal multi-functional control circuit of the chip includes a current module 100, a power-off module 200, and a state control module 300. The current module 100 is connected to the power-off module 200 and the state control module 300 via pin A. The power-off module 200 is configured to output a first control signal when the voltage at pin A is less than a first voltage V1, causing the chip to enter a power-off mode, and to output a second control signal when the voltage at pin A is greater than the first voltage V1. The state control module is configured to cause the chip to enter a standby mode when the power-off module outputs the second control signal and the voltage at pin A is greater than the first voltage V1 and less than the second voltage V2; and to control the chip to enter a soft-start mode when the power-off module outputs the second control signal and the voltage at pin A is greater than the second voltage V2. After the soft-start mode ends, the chip enters a normal operating mode.

[0050] Specifically, when the chip is in normal operation, pin A is not externally connected with a voltage, under the cooperation of the current module 100 and the state control module 300, the voltage of pin A is in a state greater than the second voltage V2, that is, the voltage of pin A is greater than the first voltage V1, then the shutdown module 200 outputs the second control signal, the chip first enters the soft start mode, and enters the normal operation mode after the completion of the soft start process. When the voltage externally connected to pin A is less than the first voltage V1, the shutdown module 200 outputs the first control signal, so that the chip enters the shutdown mode. When the voltage externally connected to pin A is between the first voltage V1 and the second voltage V2, the shutdown module 200 outputs the second control signal, and cooperates with the state control module 300 to control the chip to be in the standby mode. As can be seen, only through the voltage interval setting of pin A, the switching control of multiple working modes of the chip can be realized.

[0051] According to the above embodiment, by integrating multiple functional modules in the chip and combining the voltage change of a single pin to control different working states of the chip, the accurate switching of multiple modes such as shutdown, standby, soft start and normal operation can be realized, the structure design of the traditional scheme of multiple pin dispersion control is avoided, the chip peripheral circuit is significantly simplified, the circuit complexity is reduced, thereby effectively reducing the chip size and improving the system integration. At the same time, the multi-functional control circuit inside the chip provided by the present application realizes the control of the circuit soft start through a single state control module 300, and also has the adjustment ability of steady-state output after the circuit enters the normal working state, thereby improving the utilization efficiency of the module and the overall control performance.

[0052] Figure 2 The circuit topological graph of the current module 100 and the state control module 300 according to one embodiment of the present application is shown. As shown in the figure, Figure 2 In the current module 100, the power supply voltage VCC is sequentially grounded through the fifth resistor R5 and the first current source B1. The power supply voltage VCC is also sequentially grounded through the eighth controllable current source G8, the second transistor Q2 and the sixth resistor R6, the positive control end of the eighth controllable current source G8 is connected to the first end of the fifth resistor R5, and the negative control end of the eighth controllable current source G8 is connected to the second end of the fifth resistor R5. The power supply voltage VCC is also sequentially grounded through the ninth controllable current source G9, the third transistor Q3 and the seventh resistor R7, the positive control end of the ninth controllable current source G9 is connected to the first end of the fifth resistor R5, the negative control end of the ninth controllable current source G9 is connected to the second end of the fifth resistor R5, the base of the third transistor Q3 is connected to the base of the second transistor Q2, and the base of the third transistor Q3 is also connected to the collector of the third transistor Q3. The power supply voltage VCC is also sequentially grounded through the eighth resistor R8, the sixth switch tube M6 and the seventh resistor R7, and the control end of the sixth switch tube M6 is connected to the collector of the second transistor Q2.

[0053] In one embodiment, the number ratio of the second triode Q2 to the third triode Q3 is 1:N, where N is greater than 1, the current coefficients of the eighth controllable current source G8 and the ninth controllable current source G9 are equal, and the resistances of the sixth resistor R6 and the seventh resistor R7 are the same.

[0054] In one embodiment, the reference Figure 2 In the current module 100, the power supply voltage VCC is further connected to ground through the tenth controllable current source G10 and the ninth resistor R9 in sequence, the positive control end of the tenth controllable current source G10 is connected to the first end of the eighth resistor R8, and the negative control end of the tenth controllable current source G10 is connected to the second end of the eighth resistor R8. The power supply voltage VCC is further connected to ground through the tenth resistor R10 and the eleventh controllable current source G11 in sequence, the positive control end of the eleventh controllable current source G11 is connected to the first end of the ninth resistor R9, the negative control end of the eleventh controllable current source G11 is connected to the second end of the ninth resistor R9, the positive control end of the eleventh controllable current source G11 is connected to the positive control end of the first controllable current source G1 and the positive control end of the third controllable current source G3, and the negative control end of the eleventh controllable current source G11 is connected to the negative control end of the first controllable current source G1 and the negative control end of the third controllable current source G3. The power supply voltage VCC is further connected to the pin A through the twelfth controllable current source G12, the positive control end of the twelfth controllable current source G12 is connected to the first end of the tenth resistor R10, the negative control end of the twelfth controllable current source G12 is connected to the second end of the tenth resistor R10, the positive control end of the twelfth controllable current source G12 is connected to the positive control end of the second controllable current source G2 and the positive control end of the fourth controllable current source G4, and the negative control end of the twelfth controllable current source G12 is connected to the negative control end of the second controllable current source G2 and the negative control end of the fourth controllable current source G4.

[0055] In one embodiment, the current coefficients of the first controllable current source G1, the tenth controllable current source G10, the eleventh controllable current source G11, and the twelfth controllable current source G12 are all 1.

[0056] According to the above embodiment, the working principle of the current module 100 is as follows: after the circuit is powered on, the first current source B1 generates a current, the current flows through the fifth resistor R5, a voltage drop is generated at both ends of the fifth resistor R5, and the eighth controllable current source G8 and the ninth controllable current source G9 generate the first current I1 and the second current I2 respectively according to the voltage drop. Since the current coefficients of the eighth controllable current source G8 and the ninth controllable current source G9 are equal, the first current I1 is equal to the second current I2. At this time, the ninth controllable current source G9 pulls up the base voltages of the second transistor Q2 and the third transistor Q3, so that the second transistor Q2 and the third transistor Q3 are turned on. Since the sixth switch tube M6 is not turned on when the circuit is powered on, the first current I1 and the second current I2 all flow into the second transistor Q2 and the third transistor Q3 respectively. Since the sixth resistor R6 and the seventh resistor R7 have equal resistance values, at this time, the voltage difference between the base and the emitter of the second transistor Q2 is equal to the voltage difference between the base and the emitter of the third transistor Q3, that is, VBE2 = VBE3. However, since the number ratio of the second transistor Q2 and the third transistor Q3 is 1:N (N>1), under the condition that the currents flowing through the second transistor Q2 and the third transistor Q3 are the same, the voltage difference VBE2 required by the second transistor Q2 is necessarily greater than the voltage difference VBE3 of the third transistor Q3. Since the base voltages of the second transistor Q2 and the third transistor Q3 are determined by the third transistor Q3, at this time, the actual voltage difference VBE2 obtained by the second transistor Q2 is less than the turn-on voltage required by the second transistor Q2 when the first current I1 flows through it, resulting in that the actual current flowing through the second transistor Q2 is less than the first current I1, thereby pulling up the control end voltage of the sixth switch tube M6 and making the sixth switch tube M6 conduct. When the sixth switch tube M6 is turned on, a current is generated in the branch composed of the eighth resistor R8 and the sixth switch tube M6 and flows into the seventh resistor R7, and the terminal voltage of the seventh resistor R7 (that is, the emitter voltage of the third transistor Q3) is gradually raised. Since the current flowing through the third transistor Q3 is still the second current I2, the voltage difference between the base and the emitter of the third transistor Q3 does not change, so as the terminal voltage of the seventh resistor R7 gradually rises, that is, the emitter voltage of the third transistor Q3 gradually rises, the base voltage of the third transistor Q3 also gradually rises, that is, the base voltage of the second transistor Q2 also gradually rises. In this process, if the current flowing through the second transistor Q2 does not change, but the voltage difference between the base and the emitter of the second transistor Q2 becomes larger, it is contradictory; if the current flowing through the second transistor Q2 becomes smaller, but the voltage difference between the base and the emitter of the second transistor Q2 becomes larger, it is also contradictory. Therefore, as the base voltage of the second transistor Q2 gradually rises, the turn-on capability of the second transistor Q2 is enhanced, and the current flowing through the second transistor Q2 gradually becomes larger. When the current flowing through the second transistor Q2 increases to be greater than the first current I1, the sixth switch tube M6 is turned off. After the sixth switch tube M6 is turned off, the base voltage of the second transistor Q2 decreases, the current flowing through the second transistor Q2 decreases, and the sixth switch tube M6 is turned on again.Thus, the circuit is in a steady state, the current through the second transistor Q2 is equal to the first current I1, and the sixth switch M6 remains in the on state. The current generated in the branch consisting of the eighth resistor R8 and the sixth switch M6 is denoted as I0, and the following can be obtained. Since I1=I2, R6=R7, the following can be obtained .

[0057] Subsequently, the current I0 flows through the eighth resistor R8, generating a voltage drop across it, which causes the tenth controllable current source G10 to generate a current equal in magnitude to the current I0. This current flows into the ninth resistor R9, causing the eleventh controllable current source G11 to generate a current equal in magnitude to the current I0, which continues to flow through the tenth resistor R10, causing the twelfth controllable current source G12 to generate a charging current IC equal to the current I0, i.e. .

[0058] In one embodiment, with reference to Figure 2 In the state control module 300, the power supply voltage VCC is grounded in sequence through the first transistor Q1, the first resistor R1, and the first controllable current source G1, and the base of the first transistor Q1 is connected to pin A. The power supply voltage is also grounded in sequence through the second controllable current source G2 and the first switch M1, and the control end of the first switch M1 is connected to the first node B between the first resistor R1 and the first controllable current source G1. The state control module 300 includes a first capacitor C1, the first end of the first capacitor C1 is connected to pin A, and the second end of the first capacitor C1 is grounded. The state control module 300 further includes a voltage regulation unit 310, which is connected to the second node C between the second controllable current source G2 and the first switch M1, and the output end of the voltage regulation unit 310 is connected to the external power circuit of the chip. The voltage regulation unit 310 is configured to regulate the voltage of the second node C in a soft start mode until the voltage of the second node C stabilizes at a first preset value, at which point the soft start mode ends.

[0059] In one embodiment, with reference to Figure 2 The state control module 300 further includes a second switch M2, the current input end of which is connected to the second node C, the current output end of which is grounded, and the control end of which is connected to a reference voltage VR. The first preset value is the sum of the voltage difference VGS and the reference voltage VR, and the voltage difference VGS is the voltage difference between the control end and the current input end of the second switch M2.

[0060] In one embodiment, with reference to Figure 2In the voltage regulation unit 310, the power supply voltage VCC is sequentially grounded through the second resistor R2, the third switch tube M3 and the third controllable current source G3, the control end of the third switch tube M3 is connected to the second node C. The power supply voltage VCC is also sequentially grounded through the third resistor R3, the fourth switch tube M4 and the third controllable current source G3. The power supply voltage VCC is also sequentially grounded through the fourth controllable current source G4 and the fifth switch tube M5, the control end of the fifth switch tube M5 is connected to the voltage VS, and the voltage VS is the output detection voltage of the chip external power circuit, and the size of the voltage VS is proportional to the output current or voltage of the chip external power circuit. The control end of the fourth switch tube M4 is connected to the third node D between the fourth controllable current source G4 and the fifth switch tube M5. The power supply voltage VCC is also sequentially grounded through the fifth controllable current source G5 and the fourth resistor R4, the positive control end of the fifth controllable current source is connected to the power supply voltage VCC, and the negative control end is connected to the current input end of the fourth switch tube M4. The power supply voltage VCC is also sequentially grounded through the sixth controllable current source G6 and the seventh controllable current source G7, the positive control end of the sixth controllable current source G6 is connected to the power supply voltage VCC, the negative control end of the sixth controllable current source G6 is connected to the current input end of the third switch tube M3, the positive control end of the seventh controllable current source G7 is connected to the first end of the fourth resistor R4, and the negative control end of the seventh controllable current source G7 is connected to the second end of the fourth resistor R4. The fourth node E between the sixth controllable current source G6 and the seventh controllable current source G7 serves as the output end of the voltage regulation unit 310.

[0061] In one embodiment, the resistance values of the second resistor R2 and the third resistor R3 are the same, the current coefficients of the fifth controllable current source G5, the sixth controllable current source G6 and the seventh controllable current source G7 are equal, and are preferably 1. The parameters of the first switch tube M1, the second switch tube M2 and the fifth switch tube M5 are the same, and are preferably MOS tubes, so that the gate-source voltage differences of the first switch tube M1, the second switch tube M2 and the fifth switch tube M5 after conduction are all VGS.

[0062] According to the above embodiment, the working principle of the state control module 300 is as follows: after the charging current IC is generated, the first capacitor C1 is charged, so that the voltage of the pin A gradually rises to the second voltage V2. When the voltage of the pin A reaches the second voltage V2, the first triode Q1 is turned on. Since there is a current flowing through the ninth resistor R9 in advance, the first controllable current source G1 and the third controllable current source G3 remain in the conduction state, and the voltage of the first node B is pulled to the ground potential (GND). During the conduction of the first triode Q1, a conduction current ID equal in size to the current I0 is generated in the first controllable current source G1, and the conduction current ID sequentially flows through the first triode Q1 and the first resistor R1. Therefore, the second voltage V2 satisfies the formula wherein VBE1 is the voltage difference between the base and the emitter of the first transistor Q1. Since VBE1 has an opposite temperature coefficient to the thermal voltage VT, and the seventh resistor R7 has the same temperature coefficient as the first resistor R1, by proper parameter design, the second voltage V2 can achieve zero temperature drift characteristic. This design significantly improves the reliability of the multi-functional control circuit inside the chip, avoids the control logic abnormality caused by the second voltage V2 being lower than the first voltage V1 due to temperature drift, and ensures consistent startup characteristics of the chip in the full temperature range.

[0063] At the same time, since there is current flowing through the tenth resistor R10, the second controllable current source G2 and the fourth controllable current source G4 are kept in the on state, and the current input end voltages of the first switch tube M1 and the second switch tube M2 are pulled up to the power supply voltage through the turned-on second controllable current source G2, and the voltage VB of the first node B is pulled to GND. However, when the first transistor Q1 is just turned on, the voltage VB of the first node B is lower than the reference voltage VR, so the first switch tube M1 is turned on. At this time, the gate-source voltage difference of the turned-on first switch tube M1 is VGS, so the voltage VC of the second node C can be expressed as VC = VB + VGS. Since the voltage difference between the voltage VA of pin A and the voltage VB of the first node B is always maintained as the second voltage V2, as the charging current IC continues to charge the first capacitor C1, the voltage VA of pin A gradually rises, and the voltage VB of the first node B gradually rises from GND. When the voltage VB of the first node B rises to exceed the reference voltage VR, the first switch tube M1 is turned off, and the second switch tube M2 is turned on. At this time, the voltage VC of the second node C remains VR + VGS.

[0064] When the circuit is just powered on, the output of the external power circuit of the chip is 0, so the output detection voltage VS of the external power circuit of the chip is 0. At the same time, the fourth controllable current source G4 is turned on, pulling up the circuit input end voltage of the fifth switch tube M5, so that the fifth switch tube M5 is turned on. Since the gate-source voltage difference of the turned-on fifth switch tube M5 is VGS, the voltage VD of the third node D satisfies VD = VS + VGS. At this time, the current output end voltages of the third switch tube M3 and the fourth switch tube M4 are pulled down through the turned-on third controllable current source G3, so when the voltage VC of the second node C is higher than VGS, the third switch tube M3 is turned on, and when the voltage VD of the third node D exceeds VGS, the fourth switch tube M4 is turned on.

[0065] From the above analysis, when the first triode Q1 is turned on, the voltage VB of the first node B gradually rises from GND, resulting in the voltage VC of the second node C being greater than VGS, so that the third switch tube M3 is turned on. At this time, the current is generated in the second resistor R2, and the voltage drop is formed across the two ends thereof, so that the sixth controllable current source G6 is turned on, thereby pulling up the first output signal voltage VG1 of the control circuit. The signal controls the external power circuit of the chip to start working, so that the output detection voltage VS of the external power circuit of the chip gradually rises, so that the voltage VD of the third node D is greater than VGS, and the fourth switch tube M4 is turned on. Therefore, the current flows through the third resistor R3 and a voltage drop is generated across the two ends thereof, so that the fifth controllable current source G5 is turned on, and the current flows through the fourth resistor R4, thereby generating the current in the seventh controllable current source G7. Since the current coefficients of the fifth controllable current source G5, the sixth controllable current source G6 and the seventh controllable current source G7 are all 1, the current flowing through the sixth controllable current source G6 is equal to the current flowing through the third switch tube M3, and the current flowing through the seventh controllable current source G7 is equal to the current flowing through the fourth switch tube M4. Therefore, when the output detection voltage VS of the external power circuit of the chip rises to make the voltage VD of the third node D greater than the voltage VC of the second node C, the current flowing through the fourth switch tube M4 is greater than the current flowing through the third switch tube M3, thereby pulling down the first output signal voltage VG1 of the control circuit, and the external power circuit of the chip stops working, and the output detection voltage VS of the external power circuit of the chip decreases. Subsequently, the voltage VD of the third node D decreases to be lower than the voltage VC of the second node C, and the external power circuit of the chip restarts, and the output detection voltage VS of the external power circuit of the chip rises again. Therefore, under the control of the state control module 300, the output detection voltage VS of the external power circuit of the chip is controlled by the voltage VC of the second node C, that is, the effective regulation of the voltage VC of the second node C on the output voltage or output current of the external power circuit of the chip is realized.

[0066] In summary, when the voltage at pin A is charged to the second voltage V2, the first transistor Q1 turns on, and the voltage at pin A begins to rise from the second voltage V2. The voltage at the first node B rises from 0 along with the voltage at pin A, and the voltage at the second node C rises from VGS along with the voltage at the first node B. When the voltage at the second node C rises to VR+VGS, the voltage VC at the second node C stabilizes at VR+VGS. During the gradual increase of the voltage at the second node C, the output detection voltage VS of the external power circuit is always controlled by the voltage VC at the second node C (which can also be understood as indirectly controlled by the voltage VB at the first node B or the voltage VA at pin A). That is, the output voltage or output current of the external power circuit is controlled by the voltage VC at the second node C. Therefore, the output voltage or output current of the external power circuit gradually increases from 0 along with the voltage at the second node C, achieving a smooth start-up. When the voltage of the second node C rises to VR+VGS, the soft-start process is completed. After that, the external power circuit of the chip enters the normal operation mode. The state control module 300 dynamically adjusts the output voltage or output current of the external power circuit according to the set value of the reference voltage VR to ensure stable and reliable system operation.

[0067] Figure 3 It shows Figure 2 The waveform of the voltage VC at the second node C after the first transistor Q1 is turned on reflects the voltage change at the second node C during the soft-start phase. Since the output of the external power circuit is controlled by the voltage at this second node C, the trend of its output voltage or output current changes is similar to... Figure 3 The waveforms shown are consistent.

[0068] Figure 4 A circuit topology diagram of a shutdown module 200 according to an embodiment of the present invention is shown. Figure 4As shown, in the shutdown module 200, the power supply voltage VCC is grounded through the thirteenth controllable current source G13, the seventh switch tube M7 and the eleventh resistor R11 in turn, the positive control end of the thirteenth controllable current source G13 is connected to the first end of the tenth resistor R10, the negative control end of the thirteenth controllable current source G13 is connected to the second end of the tenth resistor R10, and the control end of the seventh switch tube M7 is connected to pin A. The power supply voltage VCC is also grounded through the thirteenth controllable current source G13, the eighth switch tube M8 and the twelfth resistor R12 in turn, and the control end of the eighth switch tube M8 is connected to the first voltage V1. The power supply voltage VCC is also grounded through the thirteenth resistor R13 and the fourteenth controllable current source G14 in turn, the positive control end of the fourteenth controllable current source G14 is connected to the first end of the twelfth resistor R12, and the negative control end of the fourteenth controllable current source G14 is connected to the second end of the twelfth resistor R12. The power supply voltage VCC is also grounded through the fifteenth controllable current source G15 and the sixteenth controllable current source G16 in turn, the positive control end of the fifteenth controllable current source G15 is connected to the first end of the thirteenth resistor R13, the negative control end of the fifteenth controllable current source G15 is connected to the second end of the thirteenth resistor R13, the positive control end of the sixteenth controllable current source G16 is connected to the first end of the eleventh resistor R11, and the negative control end of the sixteenth controllable current source G16 is connected to the second end of the eleventh resistor R11. The fifth node F between the fifteenth controllable current source G15 and the sixteenth controllable current source G16 serves as an output end of the shutdown module 200.

[0069] In the present embodiment, the working principle of the shutdown module 200 is as follows: when the chip is in a normal working state, pin A has no external voltage, at this time, under the joint action of the current module 100 and the state control module 300, the voltage of pin A is greater than the second voltage V2, that is, at this time, the voltage of pin A is greater than the first voltage V1, so that the shutdown module 200 outputs a high-level second output signal voltage VG2, the second output signal voltage VG2 corresponds to the second control signal output by the shutdown module 200 when it is high level, and the second output signal voltage VG2 corresponds to the first control signal output by the shutdown module 200 when it is low level. At the same time, the chip external power circuit completes the soft start process under the control of the state control module 300, and then enters the normal running mode, and adjusts the output voltage or output current according to the size of the reference voltage VR.

[0070] When an input voltage less than the first voltage V1 is externally connected to the chip pin, that is, when the voltage of pin A is less than the first voltage V1, the gate-source voltage difference of the seventh switch tube M7 is greater than that of the eighth switch tube M8, so the current flowing through the eleventh resistor R11 is greater than that flowing through the twelfth resistor R12, and at the same time, since the current coefficients of the fourteenth controllable current source G14, the fifteenth controllable current source G15 and the sixteenth controllable current source G16 are equal, combined with the fact that the current flowing through the fifteenth controllable current source G15 is greater than that flowing through the sixteenth controllable current source G16, the voltage of the fifth node F is less than the second voltage V2, that is, the voltage of the fifth node F is less than the first voltage V1, so that the shutdown module 200 outputs a low-level second output signal voltage VG2, and the second output signal voltage VG2 corresponds to the first control signal output by the shutdown module 200 when it is low level.Figure 4 As shown in the circuit structure, the current flowing through the eleventh resistor R11 is equal to the current generated in the sixteenth controllable current source G16, and the current flowing through the twelfth resistor R12 is equal to the current generated in the fifteenth controllable current source G15, so when an input voltage less than the first voltage V1 is externally connected at the chip pin, the current generated in the sixteenth controllable current source G16 is greater than the current generated in the fifteenth controllable current source G15, thereby pulling down the second output signal voltage VG2 of the control circuit, and the chip is in the shutdown mode according to the low-level second output signal.

[0071] When an input voltage greater than the first voltage V1 and less than the second voltage V2 is externally connected at the chip pin, that is, when the voltage of the pin A is greater than the first voltage V1, the gate-source voltage difference of the seventh switch tube M7 is less than the gate-source voltage difference of the eighth switch tube M8, and the current flowing through the eleventh resistor R11 is less than the current flowing through the twelfth resistor R12, so at this time, the current generated in the sixteenth controllable current source G16 is less than the current generated in the fifteenth controllable current source G15, thereby pulling up the second output signal voltage VG2 of the control circuit. At the same time, since the voltage of the pin A is less than the second voltage V2, the voltage of the pin B is less than the second voltage V2, and the voltage of the pin C is greater than the second voltage V2, so the third switch tube M3 is in the on state, and the fourth switch tube M4 is in the off state, thereby pulling up the second output signal voltage VG2 of the control circuit. Figure 2 As shown in the circuit structure and the related principle analysis, at this time, the first triode Q1 is in the off state, so the voltage of the first node B is always pulled down to GND, so that the output detection voltage VS of the external power circuit of the chip is always 0, that is, it is ensured that there is no output voltage or output current in the external power circuit of the chip, that is, at this time, the chip is in the standby mode.

[0072] According to the embodiments of the present application, by reasonably configuring the key current sources, resistors and switch devices in each module, the stable output of the control signal and the temperature drift suppression are effectively ensured, and the consistency and reliability of the chip in different temperature environments are enhanced. At the same time, the control circuit simplifies the peripheral circuit configuration, reduces the system complexity, effectively reduces the chip size, and improves the integration level and engineering applicability of the overall system.

[0073] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0074] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A multi-functional control circuit inside a chip, characterized by comprising: The current module, the shutdown module and the state control module are connected through pin A; The shutdown module is configured to output a first control signal when the voltage of pin A is less than a first voltage V1, so that the chip enters a shutdown mode, and output a second control signal when the voltage of pin A is greater than the first voltage V1; The state control module is configured to make the chip enter a standby mode when the shutdown module outputs the second control signal and the voltage of pin A is greater than the first voltage V1 and less than a second voltage V2, control the chip enter a soft start mode when the shutdown module outputs the second control signal and the voltage of pin A is greater than the second voltage V2, and make the chip enter a normal operation mode after the soft start mode ends; In the state control module, the power supply voltage VCC is grounded through a first transistor Q1, a first resistor R1 and a first controllable current source G1 in sequence, the base of the first transistor Q1 is connected to pin A, and the positive control end and the negative control end of the first controllable current source G1 are connected to the current module; The power supply voltage is also grounded through a second controllable current source G2 and a first switch tube M1 in sequence, the control end of the first switch tube M1 is connected to a first node B between the first resistor R1 and the first controllable current source G1, and the positive control end and the negative control end of the second controllable current source G2 are connected to the current module; The state control module includes a first capacitor C1, the first end of the first capacitor C1 is connected to pin A, and the second end of the first capacitor C1 is grounded; The state control module further includes a voltage regulation unit, the voltage regulation unit is connected to a second node C between the second controllable current source G2 and the first switch tube M1, the output end of the voltage regulation unit is connected to an external power circuit of the chip, and the voltage regulation unit is configured to regulate the voltage of the second node C in the soft start mode until the voltage of the second node C is stabilized at a first preset value, so that the soft start mode ends.

2. The multi-functional control circuit inside a chip according to claim 1, wherein The state control module further includes: A second switch tube M2, the current input end of the second switch tube M2 is connected to the second node C, the current output end is grounded, and the control end is connected to a reference voltage VR; The first preset value is the sum of a voltage difference VGS and the reference voltage VR, and the voltage difference VGS is the voltage difference between the control end and the current input end of the second switch tube M2.

3. The multi-functional control circuit inside a chip according to claim 2, wherein In the voltage regulation unit, the power supply voltage VCC is grounded through a second resistor R2, a third switch tube M3 and a third controllable current source G3 in sequence, and the control end of the third switch tube M3 is connected to the second node C; The power supply voltage VCC is also grounded through a third resistor R3, a fourth switch tube M4 and a third controllable current source G3 in sequence, and the positive control end and the negative control end of the third controllable current source G3 are connected to the current module; The power supply voltage VCC further sequentially passes through a fourth controllable current source G4 and a fifth switch tube M5 to ground, the control end of the fifth switch tube M5 is connected to a voltage VS, the voltage VS is an output detection voltage of a chip external power circuit, the size of the voltage VS is proportional to the output current or voltage of the chip external power circuit; the control end of the fourth switch tube M4 is connected to a third node D between the fourth controllable current source G4 and the fifth switch tube M5, and the positive control end and the negative control end of the fourth controllable current source G4 are connected to the current module; The power supply voltage VCC further sequentially passes through a fifth controllable current source G5 and a fourth resistor R4 to ground, the positive control end of the fifth controllable current source is connected to the power supply voltage VCC, and the negative control end is connected to the current input end of the fourth switch tube M4; The power supply voltage VCC further sequentially passes through a sixth controllable current source G6 and a seventh controllable current source G7 to ground, the positive control end of the sixth controllable current source G6 is connected to the power supply voltage VCC, the negative control end of the sixth controllable current source G6 is connected to the current input end of the third switch tube M3, the positive control end of the seventh controllable current source G7 is connected to the first end of the fourth resistor R4, and the negative control end of the seventh controllable current source G7 is connected to the second end of the fourth resistor R4; The fourth node E between the sixth controllable current source G6 and the seventh controllable current source G7 serves as an output end of the voltage regulation unit.

4. The multi-functional control circuit inside a chip according to claim 3, wherein The second resistor R2 and the third resistor R3 have the same resistance, the current coefficients of the fifth controllable current source G5, the sixth controllable current source G6 and the seventh controllable current source G7 are equal, and the first switch tube M1, the second switch tube M2 and the fifth switch tube M5 have the same parameters.

5. The multi-functional control circuit inside a chip according to claim 4, wherein In the current module, the power supply voltage VCC sequentially passes through a fifth resistor R5 and a first current source B1 to ground; The power supply voltage VCC further sequentially passes through an eighth controllable current source G8, a second triode Q2 and a sixth resistor R6 to ground, the positive control end of the eighth controllable current source G8 is connected to the first end of the fifth resistor R5, and the negative control end of the eighth controllable current source G8 is connected to the second end of the fifth resistor R5; The power supply voltage VCC further sequentially passes through a ninth controllable current source G9, a third triode Q3 and a seventh resistor R7 to ground, the positive control end of the ninth controllable current source G9 is connected to the first end of the fifth resistor R5, the negative control end of the ninth controllable current source G9 is connected to the second end of the fifth resistor R5, the base of the third triode Q3 is connected to the base of the second triode Q2, and the base of the third triode Q3 is also connected to the collector of the third triode Q3; The power supply voltage VCC further sequentially passes through an eighth resistor R8, a sixth switch tube M6 and a seventh resistor R7 to ground, and the control end of the sixth switch tube M6 is connected to the collector of the second triode Q2.

6. The multi-functional control circuit inside a chip according to claim 5, wherein The number ratio of the second triode Q2 and the third triode Q3 is 1:N, wherein N is greater than 1, the current coefficients of the eighth controllable current source G8 and the ninth controllable current source G9 are equal, and the resistances of the sixth resistor R6 and the seventh resistor R7 are the same.

7. The multi-functional control circuit inside a chip according to claim 6, wherein In the current module, the power supply voltage VCC further sequentially passes through a tenth controllable current source G10 and a ninth resistor R9 to ground, a positive control end of the tenth controllable current source G10 is connected to a first end of the eighth resistor R8, and a negative control end of the tenth controllable current source G10 is connected to a second end of the eighth resistor R8. The power supply voltage VCC further sequentially passes through a tenth resistor R10 and an eleventh controllable current source G11 to ground, a positive control end of the eleventh controllable current source G11 is connected to a first end of the ninth resistor R9, a negative control end of the eleventh controllable current source G11 is connected to a second end of the ninth resistor R9, the positive control end of the eleventh controllable current source G11 is connected to the positive control end of the first controllable current source G1 and the positive control end of the third controllable current source G3, and the negative control end of the eleventh controllable current source G11 is connected to the negative control end of the first controllable current source G1 and the negative control end of the third controllable current source G3. The power supply voltage VCC further passes through a twelfth controllable current source G12 to the pin A, a positive control end of the twelfth controllable current source G12 is connected to a first end of the tenth resistor R10, a negative control end of the twelfth controllable current source G12 is connected to a second end of the tenth resistor R10, the positive control end of the twelfth controllable current source G12 is connected to the positive control end of the second controllable current source G2 and the positive control end of the fourth controllable current source G4, and the negative control end of the twelfth controllable current source G12 is connected to the negative control end of the second controllable current source G2 and the negative control end of the fourth controllable current source G4.

8. The multi-functional control circuit inside a chip according to claim 7, wherein The current coefficients of the first controllable current source G1, the tenth controllable current source G10, the eleventh controllable current source G11 and the twelfth controllable current source G12 are all 1.

9. The multi-functional control circuit inside a chip according to claim 8, wherein The formula of the second voltage V2 is: ； Wherein, VBE1 is the voltage difference between the base and the emitter of the first triode Q1.

10. The multi-functional control circuit inside a chip according to claim 9, wherein In the shutdown module, the power supply voltage VCC sequentially passes through a thirteenth controllable current source G13, a seventh switch tube M7 and an eleventh resistor R11 to ground, a positive control end of the thirteenth controllable current source G13 is connected to a first end of the tenth resistor R10, a negative control end of the thirteenth controllable current source G13 is connected to a second end of the tenth resistor R10, and a control end of the seventh switch tube M7 is connected to the pin A. The power supply voltage VCC further sequentially passes through the thirteenth controllable current source G13, an eighth switch tube M8 and a twelfth resistor R12 to ground, and a control end of the eighth switch tube M8 is connected to the first voltage V1. The power supply voltage VCC further sequentially passes through a thirteenth resistor R13 and a fourteenth controllable current source G14, a positive control end of the fourteenth controllable current source G14 being connected to a first end of the twelfth resistor R12, and a negative control end of the fourteenth controllable current source G14 being connected to a second end of the twelfth resistor R12; The power supply voltage VCC further sequentially passes through a fifteenth controllable current source G15 and a sixteenth controllable current source G16, a positive control end of the fifteenth controllable current source G15 being connected to a first end of the thirteenth resistor R13, a negative control end of the fifteenth controllable current source G15 being connected to a second end of the thirteenth resistor R13, a positive control end of the sixteenth controllable current source G16 being connected to a first end of the eleventh resistor R11, and a negative control end of the sixteenth controllable current source G16 being connected to a second end of the eleventh resistor R11; A fifth node F between the fifteenth controllable current source G15 and the sixteenth controllable current source G16 serves as an output end of the shutdown module.

11. The multi-functional control circuit inside a chip according to claim 10, wherein Current coefficients of the fourteenth controllable current source G14, the fifteenth controllable current source G15 and the sixteenth controllable current source G16 are equal.

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