Constant on-time converter control circuit and constant on-time converter

Abstract

A constant on-time converter control circuit and a constant on-time converter are provided. The constant on-time converter control circuit includes an error amplifier, a voltage-to-current converter, and an initial current source. The error amplifier receives a reference voltage signal and a feedback voltage signal and outputs a compensation voltage signal. The voltage-to-current converter receives the compensation voltage signal and outputs a converted current signal. The initial current source provides an initial current signal. The initial current signal and the converted current signal form a new reference voltage signal. A constant on-time off-time comparator receives the new reference voltage signal and the feedback voltage signal and outputs a control signal. The control signal affects the turn-on and turn-off of a plurality of electronic switches to generate an output voltage of the constant on-time converter.

Description

Technical Field

[0001] This invention relates to a constant on-time converter, and more particularly to a control circuit for a constant on-time converter that can be effectively controlled to improve power supply voltage and load regulation. Background Technology

[0002] Switching converters utilizing constant on-time (COT) circuits are commonly used in switch-mode power supplies. However, stabilizing the output voltage using constant on-time (COT) control circuits is challenging.

[0003] A common drawback of constant on-time (COT) control circuits is that transient response errors negatively impact the power supply voltage signal and the load regulation signal.

[0004] Therefore, in order to overcome the shortcomings of prior art, it is necessary to improve constant on-time (COT) converters to achieve power supply voltage and load regulation efficiently and effectively. Summary of the Invention

[0005] The purpose of this application is to provide an effective controllable constant on-time (COT) converter control circuit to improve power supply voltage and load regulation.

[0006] According to an embodiment of this application, this application provides a constant on-time (COT) converter control circuit, which includes an error amplifier, a voltage-to-current converter, and an initial current source.

[0007] The error amplifier receives a reference voltage signal and a feedback voltage signal and outputs a compensation voltage signal. The voltage-to-current converter receives the compensation voltage signal and outputs a converted current signal. The initial current source provides an initial current, and the initial current and the converted current signal form a new reference voltage signal.

[0008] In some embodiments of the constant on-time converter control circuit, the constant on-time converter control circuit further includes a comparator for receiving the new reference voltage signal and the feedback voltage signal and outputting a control signal.

[0009] In some embodiments of the constant on-time converter control circuit, the control signal affects the opening and closing of multiple electronic switches to generate the output voltage signal of the constant on-time converter.

[0010] In some embodiments of the constant on-time converter control circuit, the comparator includes an off-time comparator.

[0011] In some embodiments of the constant on-time converter control circuit, the constant on-time converter control circuit further includes a summing resistor electrically connected to the initial current source.

[0012] In some embodiments of the constant on-time converter control circuit, the constant on-time converter control circuit further includes a low-pass filter, which is electrically connected to the input of the error amplifier.

[0013] In some embodiments of the constant on-time converter control circuit, the low-pass filter includes a filter resistor and a filter capacitor.

[0014] In some embodiments of the constant on-time converter control circuit, the constant on-time converter control circuit further includes a compensation capacitor electrically connected to the output terminal of the error amplifier.

[0015] In some embodiments of the constant on-time converter control circuit, the constant on-time converter control circuit includes an error amplifier, a voltage-to-current converter, an initial current source, a constant on-time and off-time comparator, a summing resistor, a low-pass filter, and a compensation capacitor. The error amplifier receives a reference voltage signal and a feedback voltage signal and outputs a compensation voltage signal. The voltage-to-current converter receives the compensation voltage signal and outputs a converted current signal. The initial current source provides an initial current signal, which, together with the converted current signal, forms a new reference voltage signal. The constant on-time and off-time comparator receives the new reference voltage signal and the feedback voltage signal and outputs a control signal, wherein the control signal affects the on and off states of multiple electronic switches to generate the output voltage signal of the constant on-time converter. The summing resistor is electrically connected to the initial current source. The low-pass filter is electrically connected to the input terminal of the error amplifier. The compensation capacitor is electrically connected to the output terminal of the error amplifier.

[0016] According to an embodiment of this application, a constant on-time converter is provided, comprising a constant on-time converter circuit and a constant on-time converter control circuit. The constant on-time converter circuit includes a comparator for receiving a new reference voltage signal and a feedback voltage signal and outputting a control signal, wherein the feedback voltage signal is provided internally by the constant on-time converter circuit. The constant on-time converter control circuit includes an error amplifier, a voltage-to-current converter, and an initial current source. The error amplifier receives the reference voltage signal and the feedback voltage signal and outputs a compensation voltage signal. The voltage-to-current converter receives the compensation voltage signal and outputs a converted current signal. The initial current source provides an initial current signal, and the initial current signal and the converted current signal form the new reference voltage signal.

[0017] In one embodiment of this application, the initial current source provides the initial current signal, the value of which is obtained by multiplying the value of the reference voltage signal by a variable and dividing by the value of the summation resistance, wherein the variable is a positive number less than 1.

[0018] In one embodiment of this application, the variable is greater than 0.5. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a constant on-time (COT) converter with control circuitry according to an embodiment of this application;

[0020] Figure 2A A schematic diagram illustrating the power supply voltage regulation of a constant on-time converter having a control circuit according to an embodiment of this application and a constant on-time converter without the control circuit.

[0021] Figure 2B A schematic diagram illustrating the load regulation of a constant on-time converter having a control circuit according to an embodiment of this application and a constant on-time converter without the control circuit.

[0022] Figure 3A A schematic diagram of the transient response of a constant on-time converter without the control circuitry of an embodiment according to this application;

[0023] Figure 3B A schematic diagram of the transient response of a constant on-time (COT) converter having an error amplifier controller according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the control circuit of a constant on-time (COT) converter according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the control circuit of a constant on-time (COT) converter according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the turn-on time control circuit of a constant on-time (COT) converter according to an embodiment of this application;

[0027] Figure 7A A waveform diagram of a transient response with a relatively long enable time according to an embodiment of this application; and

[0028] Figure 7B This is a waveform diagram of a transient response with a short enable time according to an embodiment of this application.

[0029] The accompanying figure is labeled as follows:

[0030] 100 Constant On-Time Converter

[0031] 105 comparator

[0032] 110 Monostable Multivibrator

[0033] 115 Non-overlapping modules

[0034] 120-bit Quasi-Shifter

[0035] 125 First Buffer

[0036] 130 Second Buffer

[0037] 135, 140 electronic switches

[0038] 145 capacitor

[0039] 150 Inductor

[0040] 155 First resistor

[0041] 160 Second resistor

[0042] 165 Third Resistor

[0043] 170 load capacitor

[0044] 175 load

[0045] 180 Error Amplifier Controller

[0046] 190 Start-up time control circuit

[0047] 210, 220, 230, 240 Output voltage

[0048] 310, 320 Transient Response

[0049] 400A Constant On-Time Converter Control Circuit

[0050] 405 Third Resistor

[0051] 410 First resistor

[0052] 415 Second Resistor

[0053] 420 Fourth Resistor

[0054] 425 Fifth Resistor

[0055] 430 First capacitor

[0056] 440 Error Amplifier

[0057] 450 Voltage-to-Current Converter

[0058] 460 Turn off comparator

[0059] 470 Second capacitor

[0060] 475 Sixth Resistor

[0061] 480 Current Source

[0062] 490 Additional Current Source

[0063] 600 Start-up Time Control Circuit

[0064] 610 Current Source

[0065] 615 Third Capacitor

[0066] 620 Seventh Resistor

[0067] 625 Eighth Resistor

[0068] 630 Ninth Resistor

[0069] 635 Fourth Capacitor

[0070] 640 Enable Time Comparator

[0071] LPF low-pass filter

[0072] LX Node

[0073] PM Pulse Width Modulation

[0074] V BG Input voltage signal

[0075] V DDP Input voltage signal

[0076] V IN Input voltage

[0077] V out Output voltage signal

[0078] V REF Reference voltage signal

[0079] V FB Feedback voltage signal

[0080] V SUM Voltage

[0081] V NREF New reference voltage signal Detailed Implementation

[0082] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0083] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a constant on-time (COT) converter 100 with control circuitry according to an embodiment of this application.

[0084] like Figure 1 As shown, the constant on-time (COT) converter 100 includes a constant on-time converter circuit (as shown by the dashed line) and a constant on-time converter control circuit (e.g., including an error amplifier controller 180). The constant on-time (COT) converter 100 is used to provide an output voltage signal V. out To load 175. The constant on-time converter control circuit, as the control circuit, operates based on the feedback voltage signal V. FB and reference voltage signal V REF Provide a new reference signal, wherein the feedback voltage signal V FB This is provided internally by the constant on-time converter circuit. For example, the constant on-time converter circuit includes a comparator 105, a monostable multivibrator (MMV) 110, a non-overlapping module 115, a level shifter 120, multiple electronic switches (e.g., 134, 140), and an output stage. The constant on-time converter control circuit includes an error amplifier controller 180 (as shown in the EA controller).

[0085] In one embodiment, the electronic switches 135, 140 include N-type metal-oxide-semiconductor field-effect transistors (MOSFETs). In another embodiment, the electronic switches 135, 140 are other types of metal-oxide-semiconductor field-effect transistors or other electronic switches.

[0086] The following is a summary of this application. Figure 1 The structure and architecture of the constant on-time (COT) converter 100 of the embodiment will be described in detail.

[0087] like Figure 1 As shown, the first electronic switch (Q) N1 The drain of the 135 and the input voltage V IN Electrically coupled. The second electronic switch (Q) N2 The source of the first electronic switch 135 is grounded. The source of the first electronic switch 135 is connected to the drain of the second electronic switch 140.

[0088] The output stage includes an inductor (L) 150, a first resistor (R1) 155, a second resistor (R2) 160, and a third resistor (R... ESR 165. Load capacitance (C) L 170. The first terminal of the inductor 150 is connected to the node generated between the first electronic switch 135 and the second electronic switch 140. The second terminal of the inductor 150 is connected to the first terminal of the first resistor 155 and the first terminal of the third resistor 165, and provides the output voltage signal V. out The first resistor 155 is connected to the second resistor 160, and the second resistor 160 is grounded. The third resistor 165 is connected to the first load capacitor 170, and the second load capacitor 170 is grounded.

[0089] The node formed by the connection between the first resistor 155 and the second resistor 160 is electrically connected to the negative input terminal of the comparator (cmp) 105 and provides a feedback voltage signal V. FB To the comparator 105.

[0090] This feedback voltage signal V FB And it is provided to the second input terminal of the error amplifier controller (EA controller) 180. Reference voltage signal V REF It is provided to the first input terminal of the error amplifier controller 180. The output terminal of the error amplifier controller 180 is electrically connected to the positive input terminal of the comparator 105.

[0091] The output of the comparator 105 is electrically connected to the input of the monostable multivibrator (MMV) 110 and provides a pulse width modulation (PM) signal to the monostable multivibrator 110.

[0092] The monostable multivibrator 110 is, for example, an SR flip-flop with two input terminals, an R input and an S input. The output of the comparator 105 can be connected to the S input of the monostable multivibrator 110. The turn-on timing control circuit 190 can be connected to the R input of the monostable multivibrator 110. The monostable multivibrator 110 includes two output terminals, a Q output and... Output end, The output is the inverted version of the Q output. The Q output and... The output terminals are all electrically connected to the two input terminals of the non-overlapping module 115.

[0093] The first output terminal of the non-overlapping module 115 is connected to the input terminal of the level shifter 120. The second output terminal of the non-overlapping module 115 is connected to the input terminal of the second buffer 130. The output terminal of the second buffer 130 is electrically connected to the gate of the second electronic switch 140.

[0094] Input voltage signal V DDP The anode of the diode is connected to the cathode of the level shifter 120, and the cathode of the diode is connected to the first terminal of the level shifter 120. The second terminal of the level shifter 120 is connected to the first terminal of the inductor (L) 150. The output terminal of the level shifter 120 is electrically connected to the input terminal of the first buffer 125. The first terminal of the first buffer 125 is electrically connected to the first terminal of the level shifter 120 and the cathode of the diode. The second terminal of the first buffer 125 is electrically connected to the first terminal of the inductor 150 and the second terminal of the level shifter 120. The output terminal of the first buffer 125 is electrically connected to the gate of the first electronic switch 135.

[0095] Capacitor (C) boot )145 is connected between the cathode of the diode and the first end of the inductor 150.

[0096] By turning the first electronic switch 135 and the second electronic switch 140 on and off, the electronic switches 135 and 140 are controlled to transmit the input voltage V. IN Converted into the output voltage signal V out .

[0097] The first electronic switch 135 is controlled to turn on and off via the output signal of the level shifter 120 through the first buffer 125. The second electronic switch is controlled to turn on and off via the output signal output from the second output terminal of the non-overlapping module 115 through the second buffer 130.

[0098] The output voltage signal V out It is converted into the feedback voltage signal V FB The feedback voltage signal V FB The feedback voltage signal V is provided to the negative input terminal of the comparator 105 and the second terminal of the error amplifier controller 180. The error amplifier controller 180 utilizes the feedback voltage signal V FB The voltage level and the reference voltage signal V REF The voltage level is determined and the result is output to the positive input terminal of the comparator 105. The comparator 105 compares the feedback voltage signal V. FB The voltage level and the voltage level of the output signal from the error amplifier control circuit 180 are determined and a pulse width modulation (PWM) signal is output to the monostable multivibrator 110.

[0099] The monostable multivibrator 110 generates a signal and an inverse signal by receiving a signal from the comparator 105, and provides these two signals to the non-overlapping module 115.

[0100] In this way, the first output signal from the non-overlapping module 115 controls the level shifter 120 to turn the first electronic switch 135 on and off, and the second output signal from the non-overlapping module 115 turns the second electronic switch 140 on and off.

[0101] Please refer to Figure 2A , Figure 2A This diagram illustrates the power supply voltage regulation of a constant on-time converter having a control circuit according to an embodiment of this application and a constant on-time converter without said control circuit, wherein the target output voltage signal V is given when the output current is 10 mA. out Set to 1.2 volts (V). Please refer to [reference needed]. Figure 2B , Figure 2B A schematic diagram illustrating the load regulation of a constant on-time converter having a control circuit according to an embodiment of this application and a constant on-time converter without said control circuit, wherein the target output voltage signal V is 12 volts (V) when an input voltage signal is 12 volts (V). out Set to 5 volts (V). It should be noted that... Figure 2A and Figure 2B For constant on-time converters with control circuitry (e.g.) Figure 1 The simulation results compare the constant on-time converter 100 shown with a constant on-time converter without control circuitry. The constant on-time converter without control circuitry used in the simulation is, for example, one that includes... Figure 1 A constant on-time converter circuit (shown as dashed) is a constant on-time converter, but the positive input of the comparator 105 directly receives the reference voltage signal V without control circuitry. REF (For example, constant voltage).

[0102] like Figure 2A As shown, without the control circuit (e.g.) Figure 1 In the case of 180), when the input voltage (V) IN When the voltage changes, the output voltage (VOUT) (represented by 220) exceeds a range (e.g., between +0.5% and -0.5%) relative to the target input voltage (as shown by the dashed line), thus resulting in poor power supply voltage regulation. With the control circuitry (e.g., Figure 1 In the case of 180), the output voltage (VOUT) (represented by 210) remains stable and its power supply voltage regulation is improved.

[0103] like Figure 2B As shown, when the output current (IOUT) changes, without the control circuit ( Figure 1 In the case of 180), the output voltage (VOUT) (represented by 240) decreases relative to the target output voltage within a range (e.g., between +4% and -5.5%) (as shown by the dashed line), thus resulting in poor load regulation. With the control circuit (e.g., Figure 1 In the case of 180), the output voltage (VOUT) (represented by 230) remains stable and its load regulation is improved.

[0104] Please refer to Figure 3A , Figure 3A For a schematic diagram of the transient response of a constant on-time converter without the control circuitry of an embodiment according to this application, please refer to... Figure 3B , Figure 3B This is a schematic diagram of the transient response of a constant on-time converter with an error amplifier controller according to an embodiment of this application.

[0105] like Figure 3B As shown, it has the control circuit (e.g. Figure 1 The output voltage in the transient response of the constant on-time converter (180) is compared to Figure 3AThe transient response (310) of the constant on-time converter without the control circuit shown may have an undershoot waveform or a drop surge waveform (320).

[0106] Therefore, in order to improve the control circuit (e.g.: Figure 1 The transient response after the increase of 180) is used to generate a new reference voltage signal V according to an embodiment of the control circuit of the constant on-time converter proposed in this application. NREF as follows.

[0107] Please refer to Figure 4 , Figure 4 This is a schematic diagram of a control circuit (or constant on-time converter control circuit) for a constant on-time (COT) converter according to an embodiment of this application.

[0108] like Figure 4 As shown, this is used to generate a new reference voltage signal V. NREF The constant on-time converter control circuit 400 includes an error amplifier 440 (or an error amplifier stage) and a voltage-to-current converter 450.

[0109] The error amplifier 440 is used to receive the reference voltage signal V. REF and feedback voltage signal V FB It also outputs a compensation voltage signal.

[0110] For example, the feedback voltage signal V FB This can be provided by a voltage divider. Input voltage signal V BG It is provided to the first terminal of a third resistor (R3) 405. The second terminal of the third resistor 405 is connected to a first resistor (R... TRIM1 The first terminal of the first resistor 410 is electrically connected. The second terminal of the first resistor 410 is connected to a second resistor (R). TRIM2 The first terminal of resistor 415 is electrically connected. The second terminal of resistor 415 is electrically connected to the first terminal of a fourth resistor (R4) 420. The node formed by the connection between the first resistor 410 and the second resistor 415 is electrically connected to the first terminal of a fifth resistor (R5) 425 to provide the reference voltage signal V. REF .

[0111] In the error amplifier stage (e.g., shown by dashed lines), the second terminal of the fifth resistor 425 is connected to the first terminal of the error amplifier 440. The first capacitor (C1) 430 is connected between the first input terminal of the error amplifier 440 and the reference ground terminal. The feedback voltage signal V... FB The feedback voltage signal V is provided to the second input terminal of the error amplifier 440. FB The constant on-time converter circuit (such as) Figure 1 (As shown by the dashed line) is provided inside.

[0112] The output of the error amplifier 440 is electrically connected to the input of the voltage-to-current converter 450 (e.g., an operational amplifier-based active voltage-to-current converter). A second capacitor (C2) 470 is connected between the output of the error amplifier 440 and ground. The output of the voltage-to-current converter 450 provides a current source 480 to generate a voltage V. SUM The new reference voltage signal V is used as the reference voltage signal. NREF The new reference voltage signal V NREF A second input is provided to the turn-off time comparator 460. A sixth resistor (R6) 475 is connected to the second input of the turn-off time comparator 460. The feedback voltage signal V... FB Provided to the first input terminal of the off-time comparator 460.

[0113] In operation, the error amplifier 440, the fifth resistor 425, and the first capacitor 430 (or the error amplifier stage) work together to provide DC calibration. The second capacitor 470 provides compensation.

[0114] Please refer to Figure 4 as well as Figure 1 According to one embodiment of this application, Figure 4 The output of the constant on-time converter control circuit 400 is the new reference voltage signal V. NREF The new reference voltage signal V NREF Used to input Figure 1 The positive input terminal of the comparator 105.

[0115] In the embodiments of this application, Figure 4 The off-time comparator 460 as Figure 1 One implementation of comparator 105.

[0116] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the control circuit of a constant on-time (COT) converter according to an embodiment of this application.

[0117] exist Figure 5 In the embodiments of this application shown, compared to Figure 4 The constant on-time converter control circuit 400A also includes an additional current source 490, which provides an initial current Iinit to the second input of the off-time comparator 460 to provide a voltage V. SUM The new reference voltage signal V is used as the reference voltage signal. NREF The new reference voltage signal VNREF The determination is based on the current source 480 and the current source 490. In some embodiments, the current source 490 may be implemented using one or more current sources.

[0118] For example, the formula for the initial current is Iinit * R6 = variable * V REF R6 represents Figure 5 The resistance value of the sixth resistor in the middle is 475V, V. REF This represents the reference voltage signal supplied to the first terminal of the fifth resistor 425. In other words, the current value of the initial current signal can be determined by multiplying the reference voltage signal by a variable and dividing by the resistance value of the summing resistor. This variable is, for example, a weight value selected according to circuit requirements. A larger variable will result in faster switching speeds or better transient response. For example, the variable can be selected as 0.9 to obtain 90% of V... REF As a result. In some embodiments, the variable can be a positive number less than 1, such as 0.5, 0.6, 0.7, 0.8, 0.91, or 0.95, to obtain a proportional V. REF As a result, during the operation of the constant on-time converter control circuit, the initial current Iinit remains enabled and is never disabled.

[0119] exist Figure 5 In the embodiments, compared to Figure 4 Since the current source 490 provides the initial current Iinit, the load on the current source 480 provided by the error amplifier 440 through the voltage-to-current converter 450 will be reduced or shared by the current source 490. Therefore, the transient response of the constant on-time converter using the constant on-time converter control circuit 400A can be improved.

[0120] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the on-time control circuit 600 of a constant on-time (COT) converter according to one embodiment of this application. Please refer to... Figure 6 and Figure 1 In one embodiment of this application, Figure 6 The start-up time control circuit 600 is Figure 1 One implementation of the on-time control circuit 190, and Figure 6 The output terminal of the 600 start-up time control circuit is connected to Figure 1 The R input terminal of the monostable multivibrator 110 is coupled.

[0121] The on-time control circuit 600 includes a current source 610 that provides a signal to the second input of the on-time comparator 640, wherein the current of the current source 610 is configured to be the same as the input voltage V of the constant on-time (COT) converter 100. IN Proportional. Therefore, the activation time will decrease as the signal increases.

[0122] The first terminal of the seventh resistor (R7) 620 is connected to the output stage, for example, to node LX connected to the inductor 150. The second terminal of the seventh resistor (R7) 620 is connected to the first terminal of the eighth resistor (R8) 625. The second terminal of the eighth resistor 625 is connected to a reference ground terminal. The first terminal of the ninth resistor (R9) 630 is connected to the node formed between the seventh resistor 620 and the eighth resistor 625. The second terminal of the ninth resistor 630 is connected to the first input terminal of the turn-on time comparator 640.

[0123] The third capacitor (C3) 615 is connected between the current source 610 and the reference ground terminal. The fourth capacitor (C4) 635 is connected between the second terminal of the ninth resistor 630 and the reference ground terminal. The ninth resistor 630 and the fourth capacitor 635 together form a low-pass filter LPF. The signal output by the low-pass filter LPF to the first input terminal of the turn-on time comparator 640 is approximately equal to the output voltage signal V. out .

[0124] Please refer to Figure 7A , Figure 7A For a waveform diagram of a transient response with a relatively long enable time according to an embodiment of this application, please refer to... Figure 7B , Figure 7B This is a waveform diagram of a transient response with a short enable time according to an embodiment of this application.

[0125] like Figure 7A As shown, a circuit transient response with a long enable time will result in a drooping surge (or undershoot) during transition. Figure 7B As shown, the transient response of a circuit with a short enable time will not exhibit a drop spike during transition.

[0126] In the above embodiments, the constant on-time (COT) converter 100 is described for illustrative purposes only. Of course, the present application includes converter control circuitry (such as...) Figure 5 The constant on-time converter (as shown) can be based on Figure 1 This can be achieved using a constant on-time converter circuit (as shown by the dashed line) or other constant on-time converter circuits (e.g., a buck converter).

[0127] The present invention has been disclosed above with several embodiments; however, those skilled in the art should understand that the embodiments are merely illustrative of the invention and should not be construed as limiting its scope. It should be noted that all variations and substitutions equivalent to the described embodiments should be considered within the scope of the present invention. Therefore, the scope of protection of the present invention is determined by the claims.

Claims

1. A constant on-time converter control circuit, characterized in that, include: An error amplifier is used to receive a reference voltage signal and a feedback voltage signal and output a compensation voltage signal. A voltage-to-current converter is used to receive the compensation voltage signal and output a converted current signal; as well as An initial current source is provided to provide an initial current signal, which, together with the converted current signal, forms a new reference voltage signal; The constant on-time converter control circuit further includes: a summing resistor, which is electrically connected to the initial current source; The initial current source provides the initial current signal, the value of which is obtained by multiplying the value of the reference voltage signal by a variable and dividing by the value of the summation resistance, wherein the variable is a positive number less than 1.

2. The constant on-time converter control circuit according to claim 1, characterized in that, The constant on-time converter control circuit further includes: A comparator is used to receive the new reference voltage signal and the feedback voltage signal and output a control signal.

3. The constant on-time converter control circuit according to claim 2, characterized in that, The control signal affects the opening and closing of multiple electronic switches to generate the output voltage signal of the constant on-time converter.

4. The constant on-time converter control circuit according to claim 2, characterized in that, The comparator includes a shutdown time comparator.

5. The constant on-time converter control circuit according to claim 1, characterized in that, The constant on-time converter control circuit further includes: A low-pass filter is electrically connected to the input of the error amplifier.

6. The constant on-time converter control circuit according to claim 5, characterized in that, The low-pass filter includes a filter resistor and a filter capacitor.

7. The constant on-time converter control circuit according to claim 1, characterized in that, The constant on-time converter control circuit further includes: A compensation capacitor is electrically connected to the output terminal of the error amplifier.

8. The constant on-time converter control circuit according to claim 1, characterized in that, The variable is greater than 0.

5.

9. A constant on-time converter control circuit, characterized in that, include: An error amplifier is used to receive a reference voltage signal and a feedback voltage signal and output a compensation voltage signal. A voltage-to-current converter is used to receive the compensation voltage signal and output a converted current signal; An initial current source is used to provide an initial current signal, which, together with the converted current signal, forms a new reference voltage signal; A constant on-time and off-time comparator is used to receive the new reference voltage signal and the feedback voltage signal and output a control signal; The control signal therein affects the opening and closing of multiple electronic switches to generate the output voltage signal of a constant on-time converter; The total resistance is electrically connected to the initial current source; A low-pass filter is electrically connected to the input terminal of the error amplifier; as well as A compensation capacitor is electrically connected to the output terminal of the error amplifier; The initial current source provides the initial current signal, the value of which is obtained by multiplying the value of the reference voltage signal by a variable and dividing by the value of the summation resistance, wherein the variable is a positive number less than 1.

10. The constant on-time converter control circuit according to claim 9, characterized in that, The variable is greater than 0.

5.

11. A constant on-time converter, characterized in that, include: A constant on-time converter circuit includes a comparator that receives a new reference voltage signal and a feedback voltage signal and outputs a control signal, wherein the feedback voltage signal is provided internally by the constant on-time converter circuit. as well as A constant on-time converter control circuit, comprising: An error amplifier is used to receive a reference voltage signal and the feedback voltage signal and output a compensation voltage signal; A voltage-to-current converter, used to receive the compensated voltage signal and output a converted current signal; and An initial current source is provided to provide an initial current signal, which, together with the converted current signal, forms the new reference voltage signal; The constant on-time converter control circuit further includes: a summing resistor, which is electrically connected to the initial current source; The initial current source provides the initial current signal, the value of which is obtained by multiplying the value of the reference voltage signal by a variable and dividing by the value of the summation resistance, wherein the variable is a positive number less than 1.

12. The constant on-time converter according to claim 11, characterized in that, The control signal affects the opening and closing of multiple electronic switches to generate the output voltage signal of the constant on-time converter.

13. The constant on-time converter according to claim 11, characterized in that, The comparator includes a shutdown time comparator.

14. The constant on-time converter according to claim 11, characterized in that, The constant on-time converter control circuit further includes: A low-pass filter is electrically connected to the input of the error amplifier.

15. The constant on-time converter according to claim 11, characterized in that, The constant on-time converter control circuit further includes: A compensation capacitor is electrically connected to the output terminal of the error amplifier.

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