Driving circuit of integrated fault feedback unit

Abstract

The utility model discloses a drive circuit integrated with a fault feedback unit, and relates to the technical field of automobile electrical safety, the drive circuit comprises a power supply management unit, the fault feedback unit, a drive unit and a light string unit, the fault feedback unit comprises an MOS tube, a first triode and a voltage division subunit arranged between a VP pin and an FB pin of the drive unit, the control end of the MOS tube is connected with the voltage division subunit, and the input end of the MOS tube is connected with the VP pin; wherein the control end of the first triode is connected with the VP pin, and the output end of the first triode is connected with the FB pin and the VP pin, that is, when the steering lamp breaks down, the control end voltage of the MOS tube is pulled down and turned off, so that the first triode obtains a high level and is turned on, the output end voltage of the first triode is pulled down, and the FB pin voltage is pulled down; therefore, a driver is reminded that the steering lamp has faults so as to ensure the driving safety.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive safety circuits, and particularly to a drive circuit integrated with a fault feedback unit. Background Art

[0002] An automobile is a means of transportation. During the driving process of the automobile, the turn signal needs to be turned on to remind the vehicles driving behind, so that the vehicles behind can pay attention to avoid.

[0003] In the prior art, the turn signal is directly electrically connected to the power supply circuit in the automobile, and the power supply circuit supplies power to the turn signal.

[0004] However, when the turn signal fails, the driver cannot find it due to the field of vision, and the vehicle behind does not avoid because it does not see the turn signal turned on, which easily leads to vehicle collisions and causes safety problems. Summary of the Utility Model

[0005] Based on this, the purpose of the utility model is to provide a drive circuit integrated with a fault feedback unit, so as to solve the technical problem in the background art that when the turn signal fails, the driver cannot find it due to the field of vision, and the vehicle behind does not avoid because it does not see the turn signal turned on, which easily leads to vehicle collisions and causes safety problems.

[0006] The utility model provides a drive circuit integrated with a fault feedback unit. The drive circuit includes a power management unit, a drive unit and a lamp string unit electrically connected to the power management unit. The power management unit is used to connect to the in-vehicle battery and transmit the output voltage of the battery to the drive unit, so that the drive unit steps down the output voltage to output a constant current to drive the lamp string unit to emit light. The fault feedback unit is arranged between the fault pin and the FB pin of the drive unit;

[0007] The fault feedback unit includes a MOS transistor, a first triode and a voltage dividing sub-unit arranged between the VP pin and the FB pin of the drive unit. The control end of the MOS transistor is connected to the voltage dividing sub-unit, and the input end of the MOS transistor is connected to the VP pin;

[0008] Wherein, the control end of the first triode is connected to the VP pin, and the output end of the first triode is connected in parallel with the FB pin and the VP pin, so that when a fault occurs in the lamp string unit, the control end of the MOS transistor is turned off, so that the control end of the first triode is turned on by a high level, so that the output end of the first triode outputs a low voltage to the FB pin for fault feedback.

[0009] Further, the power management unit includes a first TVS tube, a first capacitor, a second capacitor, a first resistor, and a diode;

[0010] The first end of the first TVS tube, the first end of the first capacitor, and the first end of the first resistor are connected to the anode of the diode and then connected to the output terminal of the storage battery;

[0011] The second end of the first TVS tube, the second end of the first capacitor, the second end of the first resistor, and the second end of the second capacitor are connected and then connected to the ground wire;

[0012] Wherein, the cathode of the diode is connected to the first end of the second capacitor and then connected to the VP pin.

[0013] Further, the driving unit includes a chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a third capacitor;

[0014] Both ends of the second resistor are respectively connected to the cathode of the diode and the EN pin of the chip;

[0015] Both ends of the third resistor are respectively connected to the cathode of the diode, the PWM1 pin, the PWM2 pin, and the PWM3 pin of the chip;

[0016] Both ends of the fourth resistor are respectively connected to the ISET pin of the chip and the ground wire;

[0017] Both ends of the fifth resistor are respectively connected to the ISET pin of the chip and the ground wire;

[0018] Both ends of the sixth resistor are respectively connected to the IOUT1 pin, the IOUT2 pin, the IOUT3 pin of the chip, and the VSNS1 pin, the VSNS2 pin, and the VSNS3 pin of the chip;

[0019] Both ends of the seventh resistor are respectively connected to the VSNS1 pin, the VSNS2 pin, and the VSNS3 pin of the chip and the ground wire;

[0020] Both ends of the third capacitor are respectively connected to the VP pin of the chip and the ground wire;

[0021] The FAULT pin of the chip is connected to the FAULT-S pin of the chip to form the fault pin;

[0022] The TEMP pin and the EP pin of the chip are connected to the ground wire.

[0023] Further, the lamp string unit includes a first light-emitting diode, a second light-emitting diode, and a third light-emitting diode;

[0024] The positive electrode of the first light-emitting diode is connected to the IOUT1 pin, IOUT2 pin, and IOUT3 pin of the chip;

[0025] The negative electrode of the first light-emitting diode is connected to the positive electrode of the second light-emitting diode;

[0026] The negative electrode of the second light-emitting diode is connected to the positive electrode of the third light-emitting diode, and the negative electrode of the third light-emitting diode is connected to the ground wire.

[0027] Further, the voltage-dividing sub-unit includes a ninth resistor and a tenth resistor;

[0028] The ninth resistor and the tenth resistor are connected in series between the VP pin and the FB pin of the chip in sequence, and the control end of the MOS transistor is connected to the intermediate node between the ninth resistor and the tenth resistor;

[0029] Wherein, the first ends of the ninth resistor and the tenth resistor are connected, and the second end of the tenth resistor is connected to the ground wire.

[0030] Further, the fault feedback unit further includes a second triode;

[0031] Wherein, the output end of the second triode is connected to the control end of the first triode and then connected to the VP pin, and the input end of the second triode is grounded;

[0032] The control end of the second triode is connected to the input end of the first triode and then grounded;

[0033] Wherein, the output end of the first triode is connected to the VP pin.

[0034] Further, the fault feedback unit further includes an eighth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor;

[0035] Both ends of the eighth resistor are respectively connected to the fault pin of the chip and the control end of the MOS transistor;

[0036] The second end of the ninth resistor is connected to the first end of the eleventh resistor and the first end of the twelfth resistor;

[0037] The second end of the eleventh resistor is connected to the input end of the MOS transistor, the output end of the second triode, and the control end of the first triode;

[0038] The output end of the MOS transistor is connected to the ground wire;

[0039] The control end of the second triode is connected to the input end of the first triode and the first end of the thirteenth resistor;

[0040] The input terminal of the second triode is connected to the ground wire;

[0041] The second terminal of the thirteenth resistor is connected to the ground wire;

[0042] The output terminal of the first triode is connected to the second terminal of the twelfth resistor, the first terminal of the fourteenth resistor, and the first terminal of the fourth capacitor;

[0043] The second terminal of the fourth capacitor is connected to the ground wire, and the second terminal of the fourteenth resistor is connected to the FB pin.

[0044] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0045] In the drive circuit of the integrated fault feedback unit provided by the present utility model, through the integrated fault feedback unit, and the fault feedback unit includes a MOS transistor, a first triode, and a voltage dividing sub-unit disposed between the VP pin and the FB pin of the drive unit. The control terminal of the MOS transistor is connected to the voltage dividing sub-unit, and the input terminal of the MOS transistor is connected to the VP pin; the control terminal of the first triode is connected to the VP pin, and the output terminal of the first triode is connected in parallel with the FB pin and the VP pin. That is, when a turn signal fails, the voltage of the control terminal of the MOS transistor is pulled down and cannot be turned on, so that the control terminal of the first triode obtains a high level and is turned on, resulting in the voltage of the output terminal of the first triode being pulled down, and thus the voltage of the FB pin is also pulled down, thereby reminding the driver that the turn signal has failed to ensure driving safety, and further solving the technical problem in the prior art that the driver cannot find due to the reason of the field of vision, and other vehicles avoiding do not avoid because they do not see the turn signal turned on and think that this vehicle will not turn, thus easily leading to a vehicle collision and causing a safety problem. Description of the Drawings

[0046] Figure 1 It is the circuit diagram of the fault feedback unit in an embodiment of the present utility model;

[0047] Figure 2 It is the circuit diagram of the drive circuit in an embodiment of the present utility model.

[0048] Description of main component symbols: 10, power management unit; 20, fault feedback unit; 30, drive unit; 40, lamp string unit; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; TVS1, first TVS tube; D1, diode; Q1, MOS tube; Q2, second triode; Q3, first triode; U1, chip; LD1, first light-emitting diode; LD2, second light-emitting diode; LD3, third light-emitting diode. Detailed implementation manners

[0049] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present utility model are given in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0050] It should be noted that when an element is referred to as being "fixedly arranged on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0052] Please refer to Figure 1 - Figure 2 As shown, a drive circuit integrating a fault feedback unit in an embodiment of the present utility model. The drive circuit of this embodiment mainly includes a power management unit 10, a fault feedback unit 20, a drive unit 30, and a lamp string unit 40.

[0053] Specifically, the driving unit 30 and the lamp string unit 40 are electrically connected to the power management unit 10. The power management unit 10 is used to connect to the vehicle battery and transmit the output voltage of the battery to the driving unit 30, so that the driving unit 30 steps down the output voltage to output a constant current to drive the lamp string unit 40 to emit light. The fault feedback unit 20 is arranged between the fault pin and the FB pin of the driving unit 30;

[0054] The fault feedback unit 20 includes an MOS transistor Q1, a first triode Q3, and a voltage dividing sub-unit arranged between the VP pin and the FB pin of the driving unit 30. The control end of the MOS transistor Q1 is connected to the voltage dividing sub-unit, and the input end of the MOS transistor Q1 is connected to the VP pin;

[0055] Wherein, the control end of the first triode Q3 is connected to the VP pin, and the output end of the first triode Q3 is connected in parallel with the FB pin and the VP pin, so that when a fault occurs in the lamp string unit 40, the control end of the MOS transistor Q1 is turned off, so that the control end of the first triode Q3 obtains a high level and conducts, so that the output end of the first triode Q3 outputs a low voltage to the FB pin for fault feedback.

[0056] That is, through this setting, when a turn signal fails, the voltage at the control end of the MOS transistor Q1 is pulled down and cannot conduct, so that the control end of the first triode Q3 obtains a high level and conducts, resulting in the voltage at the output end of the first triode Q3 being pulled down, and thus the voltage at the FB pin is also pulled down, thereby reminding the driver that the turn signal has failed to ensure driving safety, and further solving the technical problem in the prior art that the driver cannot find due to the field of vision, and other avoiding vehicles do not avoid because they do not see the turn signal turned on and think that this vehicle will not turn, thus easily leading to vehicle collisions and causing safety problems.

[0057] Further, in this embodiment, the fault feedback unit 20 further includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a second triode Q2, and for the convenience of understanding this case, the driving unit 30 includes a chip U1.

[0058] It should be noted that the ninth resistor R9 and the tenth resistor R10 constitute the voltage dividing sub-unit.

[0059] Specifically, the following are the connection relationships between the various electronic components;

[0060] The output end of the second triode Q2 is connected to the control end of the first triode Q3 and then connected to the VP pin, and the input end of the second triode Q2 is grounded;

[0061] The control end of the second triode Q2 is connected to the input end of the first triode Q3 and then grounded;

[0062] Among them, the output end of the first triode Q3 is connected to the VP pin;

[0063] Both ends of the eighth resistor R8 are respectively connected to the fault pin of the chip U1 and the control end of the MOS transistor Q1;

[0064] The ninth resistor R9 and the tenth resistor R10 are connected in series between the VP pin and the FB pin of the chip U1 in sequence. The control end of the MOS transistor Q1 is connected to the middle node between the ninth resistor R9 and the tenth resistor R10. Among them, the first end of the ninth resistor R9 and the first end of the tenth resistor R10 are connected, and the second end of the tenth resistor R10 is connected to the ground wire;

[0065] The second end of the ninth resistor R9 is connected to the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12;

[0066] The second end of the eleventh resistor R11 is connected to the input end of the MOS transistor Q1, the output end of the second triode Q2, and the control end of the first triode Q3;

[0067] The output end of the MOS transistor Q1 is connected to the ground wire;

[0068] The control end of the second triode Q2 is connected to the input end of the first triode Q3 and the first end of the thirteenth resistor R13;

[0069] The input end of the second triode Q2 is connected to the ground wire;

[0070] The second end of the thirteenth resistor R13 is connected to the ground wire;

[0071] The output end of the first triode Q3 is connected to the second end of the twelfth resistor R12, the first end of the fourteenth resistor R14, and the first end of the fourth capacitor C4;

[0072] The second end of the fourth capacitor C4 is connected to the ground wire, and the second end of the fourteenth resistor R14 is connected to the FB pin.

[0073] It should be noted that by arranging a voltage division sub-unit in the fault feedback unit 20, in actual circuit applications, due to fluctuations in the power supply voltage or changes in the output current, the power supply voltage may become unstable. To protect each component in the circuit and reduce the impact of the power supply voltage on the circuit operation, voltage division can be used to stabilize the power supply voltage. By reasonably selecting the resistor voltage division ratio, the power supply voltage can be reduced to an appropriate range, so that the electronic components in the circuit can obtain a stable and appropriate operating voltage. And through the setting of each resistor, it is possible to avoid the instability of the electronic components caused by instantaneous current.

[0074] In some preferred embodiments, the MOS transistor Q1 can be an N-type MOS transistor Q1, whose gate, drain, and source respectively correspond to the control terminal, input terminal, and output terminal. And the N-type MOS transistor Q1 is not a limitation on the MOS transistor Q1, and it can also be of other types, which will not be specifically described here.

[0075] In addition, in this embodiment, the power management unit 10 includes a first TVS diode TVS1, a first capacitor C1, a second capacitor C2, a first resistor R1, and a diode D1;

[0076] The first terminal of the first TVS diode TVS1, the first terminal of the first capacitor C1, and the first terminal of the first resistor R1 are connected to the anode of the diode D1 and then connected to the output terminal of the storage battery;

[0077] The second terminal of the first TVS diode TVS1, the second terminal of the first capacitor C1, and the second terminal of the first resistor R1 are connected to the second terminal of the second capacitor C2 and then connected to the ground wire;

[0078] Wherein, the cathode of the diode D1 is connected to the first terminal of the second capacitor C2 and then connected to the VP pin.

[0079] The driving unit 30 further includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a third capacitor C3;

[0080] Both ends of the second resistor R2 are respectively connected to the cathode of the diode D1 and the EN pin of the chip U1;

[0081] Both ends of the third resistor R3 are respectively connected to the cathode of the diode D1 and the PWM1 pin, PWM2 pin, and PWM3 pin of the chip U1;

[0082] Both ends of the fourth resistor R4 are respectively connected to the ISET pin of the chip U1 and the ground wire;

[0083] Both ends of the fifth resistor R5 are respectively connected to the ISET pin of the chip U1 and the ground wire;

[0084] Both ends of the sixth resistor R6 are respectively connected to the IOUT1 pin, IOUT2 pin, IOUT3 pin of the chip U1 and the VSNS1 pin, VSNS2 pin, VSNS3 pin of the chip U1;

[0085] Both ends of the seventh resistor R7 are respectively connected to the VSNS1 pin, VSNS2 pin, VSNS3 pin of the chip U1 and the ground wire;

[0086] Both ends of the third capacitor C3 are respectively connected to the VP pin of the chip U1 and the ground wire;

[0087] The FAULT pin of chip U1 is connected to the FAULT-S pin of chip U1 to form a fault pin;

[0088] The TEMP pin, EP pin of chip U1 are connected to the ground wire.

[0089] It should be noted that the power management unit 10 also includes a power supply input terminal and a DC power supply voltage output terminal. Its power supply input terminal is connected to the positive output terminal of the vehicle battery, and the DC power supply voltage output terminal is connected to the DC power supply voltage input terminal of the drive unit 30 to transfer the DC output voltage VCC provided by the battery to the drive unit 30.

[0090] The lamp string unit 40 includes a first light-emitting diode LD1, a second light-emitting diode LD2, and a third light-emitting diode LD3;

[0091] The positive electrode of the first light-emitting diode LD1 is connected to the IOUT1 pin, IOUT2 pin, and IOUT3 pin of chip U1;

[0092] The negative electrode of the first light-emitting diode LD1 is connected to the positive electrode of the second light-emitting diode LD2;

[0093] The negative electrode of the second light-emitting diode LD2 is connected to the positive electrode of the third light-emitting diode LD3, and the negative electrode of the third light-emitting diode LD3 is connected to the ground wire.

[0094] In addition, it should be noted that in this embodiment, chip U1 can be a buck linear constant current chip U1. This chip U1 includes a power input terminal VP, an enable terminal EN, pulse width modulations PWM1, PWM2, PWM3, a fault pin FAULT, FAULT-S, a temperature control TEMP, a current sampling terminal ISET, a ground terminal GND, voltage detection terminals VSNS1, VSNS2, VSNS3, and drive load terminals IOUT1, IOUT2, IOUT3. The power input terminal VIN corresponds to the DC power supply voltage input terminal of the drive unit 30 to access the power supply voltage and perform buck constant current output according to the power supply voltage.

[0095] Specifically, in this embodiment, the power management unit 10 includes a first TVS tube TVS1, a first diode D1, a first capacitor C1, a second capacitor C2, and a first resistor R1. The anode of the first diode D1 is connected to the power supply input terminal, and the cathode is connected to the DC power supply voltage output terminal to form a one-way current path between the power supply input terminal and the DC power supply voltage output terminal of the power management unit 10 to prevent reverse current flow. The first capacitor C1 and the second capacitor C2 are respectively connected between the DC power supply voltage input terminal and the DC voltage output terminal and the ground and are used as voltage stabilizing capacitors to improve the stability of the DC power supply voltage.

[0096] In summary, in the drive circuit of an integrated fault feedback unit 20 in an embodiment of the present invention, compared with the power supply method for the turn signal in the prior art, there are at least the following beneficial effects:

[0097] In the drive circuit of the integrated fault feedback unit 20 provided by the present invention, through the integrated fault feedback unit 20, and the fault feedback unit 20 includes an MOS transistor Q1, a first triode Q3, and a voltage dividing sub-unit disposed between the VP pin and the FB pin of the drive unit 30. The control end of the MOS transistor Q1 is connected to the voltage dividing sub-unit, and the input end of the MOS transistor Q1 is connected to the VP pin; the control end of the first triode Q3 is connected to the VP pin, and the output end of the first triode Q3 is connected in parallel with the FB pin and the VP pin. That is, when a fault occurs in the turn signal, the voltage at the control end of the MOS transistor Q1 is pulled down and cannot be turned on, so that the control end of the first triode Q3 obtains a high level and is turned on, resulting in the voltage at the output end of the first triode Q3 being pulled down, and thus the voltage at the FB pin is also pulled down, thereby reminding the driver that the turn signal has failed to ensure driving safety, and further solving the technical problem in the prior art that the driver cannot find due to the line of sight, and other vehicles avoiding do not see the turn signal turned on and think that this vehicle will not turn and do not avoid, thus easily causing a safety problem of vehicle collision.

[0098] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A driving circuit with an integrated fault feedback unit, characterized in that: The driving circuit includes a power management unit, and a driving unit and a light string unit electrically connected to the power management unit. The power management unit is used to connect to the battery in the vehicle and transmit the output voltage of the battery to the driving unit, so that the driving unit steps down the output voltage to output a constant current to drive the light string unit to emit light. The fault feedback unit is arranged between the fault pin and the FB pin of the driving unit; The fault feedback unit comprises a MOS tube, a first triode and a voltage divider unit provided between the VP pin and the FB pin of the driving unit, the control end of the MOS tube is connected to the voltage divider unit, and the input end of the MOS tube is connected to the VP pin; Among them, the control end of the first transistor is connected to the VP pin, and the output end of the first transistor is connected in parallel with the FB pin and the VP pin, so that when the light string unit fails, the control end of the MOS tube is turned off, so that the control end of the first transistor is turned on at a high level, so that the output end of the first transistor outputs a low voltage to the FB pin for fault feedback.

2. The driving circuit of the integrated fault feedback unit according to claim 1, characterized in that: The power management unit includes a first TVS tube, a first capacitor, a second capacitor, a first resistor and a diode; The first end of the first TVS tube, the first end of the first capacitor, and the first end of the first resistor are connected to the anode of the diode and then connected to the output end of the battery; The second end of the first TVS tube, the second end of the first capacitor, the second end of the first resistor and the second end of the second capacitor are connected to the ground line; The cathode of the diode is connected to the first end of the second capacitor and then connected to the VP pin.

3. The driving circuit of the integrated fault feedback unit according to claim 2, characterized in that: The driving unit includes a chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a third capacitor; Two ends of the second resistor are connected to the cathode of the diode and the EN pin of the chip respectively; The two ends of the third resistor are respectively connected to the cathode of the diode and the PWM1 pin, the PWM2 pin and the PWM3 pin of the chip; Two ends of the fourth resistor are respectively connected to the ISET pin of the chip and the ground line; Two ends of the fifth resistor are respectively connected to the ISET pin of the chip and the ground line; The two ends of the sixth resistor are respectively connected to the IOUT1 pin, IOUT2 ​​pin, IOUT3 pin of the chip and the VSNS1 pin, VSNS2 pin, VSNS3 pin of the chip; Two ends of the seventh resistor are respectively connected to the VSNS1 pin, the VSNS2 pin, the VSNS3 pin and the ground line of the chip; Two ends of the third capacitor are connected to the VP pin of the chip and the ground wire respectively; The FAULT pin of the chip is connected to the FAULT-S pin of the chip to form the fault pin; The TEMP pin, EP pin and ground wire of the chip are connected.

4. The driving circuit of the integrated fault feedback unit according to claim 3, characterized in that: The light string unit includes a first light emitting diode, a second light emitting diode and a third light emitting diode; The positive electrode of the first light emitting diode is connected to the IOUT1 pin, IOUT2 ​​pin and IOUT3 pin of the chip; The cathode of the first light emitting diode is connected to the anode of the second light emitting diode; The cathode of the second light emitting diode is connected to the anode of the third light emitting diode, and the cathode of the third light emitting diode is connected to the ground wire.

5. The driving circuit of the integrated fault feedback unit according to claim 4, characterized in that: The voltage dividing subunit includes a ninth resistor and a tenth resistor; The ninth resistor and the tenth resistor are connected in series between the VP pin and the FB pin of the chip in sequence, and the control end of the MOS tube is connected to the middle node between the ninth resistor and the tenth resistor; The first end of the ninth resistor is connected to the first end of the tenth resistor, and the second end of the tenth resistor is connected to the ground line.

6. The driving circuit of the integrated fault feedback unit according to claim 5, characterized in that: The fault feedback unit also includes a second triode; Wherein, the output end of the second transistor is connected to the control end of the first transistor and then connected to the VP pin, and the input end of the second transistor is grounded; The control end of the second transistor is connected to the input end of the first transistor and then grounded; Wherein, the output end of the first transistor is connected to the VP pin.

7. The driving circuit of the integrated fault feedback unit according to claim 6, characterized in that: The fault feedback unit further includes an eighth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; Two ends of the eighth resistor are connected to the fault pin of the chip and the control end of the MOS tube respectively; The second end of the ninth resistor is connected to the first end of the eleventh resistor and the first end of the twelfth resistor; The second end of the eleventh resistor is connected to the input end of the MOS transistor, the output end of the second transistor, and the control end of the first transistor; The output end of the MOS tube is connected to the ground wire; The control end of the second transistor is connected to the input end of the first transistor and the first end of the thirteenth resistor; The input end of the second transistor is connected to the ground wire; The second end of the thirteenth resistor is connected to the ground line; The output end of the first transistor is connected to the second end of the twelfth resistor, the first end of the fourteenth resistor, and the first end of the fourth capacitor; The second end of the fourth capacitor is connected to the ground line, and the second end of the fourteenth resistor is connected to the FB pin.

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