DCDC constant current driving multiplexing circuit

Abstract

The utility model relates to a DCDC constant current driving multiplexing circuit. The circuit comprises a constant current circuit module, and a signal input module, a current setting switching module, a load change-over switch module, a first load module and a second load module which are respectively connected with the constant current circuit module. The signal input module is connected with the constant current circuit module, the current setting switching module, the load change-over switch module, the first load module and the second load module. The load change-over switch module is connected with the first load module and the second load module.

Description

Technical Field

[0001] This utility model relates to a vehicle lighting circuit, and in particular discloses a DC-DC constant current drive multiplexing circuit. Background Technology

[0002] Currently, there are many automotive-grade DC-DC constant current chips on the market that support high-brightness switching on the same LED panel to achieve different functions, most commonly switching between daytime running lights and position lights, or between position lights and brake lights. For such applications, the load LED panel must be the same, and function switching is achieved by controlling different output duty cycles, typically switching between high and low power. If the same display area displays different functions, all requiring high power, then general chips cannot support this.

[0003] Currently, the solutions for reusing high-power lighting fixtures are roughly as follows:

[0004] One option is to use two independent DC-DC constant current drivers to independently control the corresponding functional loads. Through external logic circuits, different functions are switched according to the priority required. This solution has the highest circuit cost.

[0005] Secondly, some dual-channel DC-DC constant current control chips are used to control two sets of power devices, such as power inductors, MOSFETs, freewheeling diodes, input and output capacitors, etc. This solution saves the cost of one chip, so the cost advantage is not obvious.

[0006] Thirdly, a DC-DC constant voltage chip is used, along with a linear constant current circuit to achieve different functional controls. This solution is widely used in some dynamic lighting fixtures, but it requires a multi-channel constant current control chip. When the power is large, the cost is also high, and the energy efficiency is not optimal. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects in the existing technology and provide a DC-DC constant current drive multiplexing circuit that controls the switching switch through a simple peripheral logic circuit and realizes two different function switching based on a DC-DC constant current circuit.

[0008] This invention is implemented as follows: A DC-DC constant current drive multiplexing circuit includes a constant current circuit module, a signal input module, a current setting switching module, a load switching switch module, a first load module, and a second load module, all connected to the constant current circuit module. The signal input module is connected to the constant current circuit module, the current setting switching module, the load switching switch module, the first load module, and the second load module, respectively. The load switching switch module is connected to the first load module and the second load module, respectively.

[0009] The current setting switching module includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1;

[0010] The base of the first transistor Q1 is connected to the signal input module and the base of the third transistor Q3. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the fourth resistor R4, and one end of the first capacitor C1 to form a voltage output control terminal, which is connected to the constant current circuit module. The other end of the fourth resistor R4 is the voltage input terminal. The other end of the first capacitor C1 is connected to the constant current circuit module. The other end of the second resistor R2 is connected to the collector of the second transistor Q2. The emitter of the second transistor Q2 is grounded. The base of the second transistor Q2 is connected to one end of the third resistor R3 and the collector of the third transistor Q3. The other end of the third resistor R3 is the voltage input terminal. The emitter of the third transistor Q3 is grounded.

[0011] The load switching module includes a fourth transistor Q4, a fifth transistor Q5, a sixth MOSFET Q6, a seventh MOSFET Q7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.

[0012] The base of the fourth transistor Q4 is connected to the signal input module, and the emitter of the fourth transistor Q4 is grounded. The collector of the fourth transistor Q4 is connected to the base of the fifth transistor Q5, one end of the sixth resistor R6, and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to one end of the second capacitor C2, the voltage input terminal, and the emitter of the fifth transistor Q5. The other end of the second capacitor C2 is grounded. The other end of the sixth resistor R6 is connected to one end of the third capacitor C3 and the gate of the seventh MOSFET Q7. The other end of C3 is grounded; the source of the seventh MOSFET Q7 is grounded, and the drain of the seventh MOSFET Q7 is connected to the first load module; the collector of the fifth transistor Q5 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, one end of the fourth capacitor C4, and the gate of the sixth MOSFET Q6; the other end of the eighth resistor R8 is grounded, the other end of the fourth capacitor C4 is grounded, the source of the sixth MOSFET Q6 is grounded, and the drain of the sixth MOSFET Q6 is connected to the second load module.

[0013] The first load module and the second load module each include a series LED string.

[0014] The signal input module includes a first signal input terminal, a second signal input terminal, a first diode D, a second diode D2, a third diode D3, a first Zener diode Z1, a ninth resistor R9, and a fifth capacitor C5;

[0015] The first signal input terminal corresponds to the first load module, and the second signal input terminal corresponds to the second load module. The first signal input terminal is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and connected to the constant current circuit module, the anode of the second diode D2 is connected to the second signal input terminal and the anode of the third diode D3, respectively. The cathode of the third diode D3 is connected to the cathode of the first Zener diode Z1, the anode of the first Zener diode Z1 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to one end of the fifth capacitor C5, the current setting switching module, and the load switching switch module, respectively.

[0016] The constant current circuit module includes chip U1, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14, fifteenth capacitor C15, eighth MOSFET Q8, first inductor L1, second inductor L2, Schottky diode D4, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, and sixteenth resistor R16; chip U1 includes VIN pin, PWM pin, IMON pin, IADJ pin, RAMP pin, SS pin, DM pin, RT pin, COMP pin, GATE pin, IS pin, GND pin, CSP pin, CSN pin, OVP pin, SLOPE pin, VREF pin, VCC pin, and EP pin;

[0017] The VIN pin of chip U1 is connected to the signal input module, one end of the sixth capacitor C6, and one end of the first inductor L1. The other end of the sixth capacitor C6 is grounded. The other end of the first inductor L1 is connected to the drain of the eighth MOSFET Q8 and one end of the seventh capacitor C7. The gate of the eighth MOSFET Q8 is connected to the GATE pin. The source of the eighth MOSFET Q8 is connected to the IS pin and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to the GND pin and then grounded. The other end of the seventh capacitor C7 is connected to the... One end of the second inductor L2 is connected to the positive terminal of the Schottky diode D4, and the other end of the second inductor L2 is grounded; the negative terminal of the Schottky diode D4 is connected to one end of the eleventh resistor R11, one end of the eighth capacitor C8, the CSP pin, and one end of the tenth resistor R10; the other end of the eighth capacitor C8 is grounded, and the other end of the tenth resistor R10 is connected to the CSN pin, the first load module, and the second load module; the other end of the eleventh resistor R11 is connected to the OVP pin and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.

[0018] The SLOPE pin is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is connected to one end of the fifteenth capacitor C15 and the EP pin of the fourteenth capacitor C14, and then grounded. The other end of the fourteenth capacitor C14 is connected to the VCC pin. The other end of the fifteenth capacitor C15 is connected to the VREF pin and the voltage input terminal, respectively.

[0019] One end of the sixteenth resistor R16 is the voltage input terminal, and the other end is connected to the PWM pin; the IMON pin is connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is connected to the current setting switching module, one end of the tenth capacitor C10, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, one end of the fifteenth resistor R15, and one end of the thirteenth capacitor C13, and then grounded; the other end of the thirteenth capacitor C13 is connected to the COMP pin; the other end of the fifteenth resistor R15 is connected to the RT pin, the other end of the twelfth capacitor C12 is connected to the DM pin, the other end of the eleventh capacitor C11 is connected to the SS pin, and the other end of the tenth capacitor C10 is connected to the RAMP pin.

[0020] The beneficial effects of this utility model are: by controlling the switching switch through a simple peripheral logic circuit, two different function switching can be achieved on the basis of a DC-DC constant current circuit; this utility model has a simple and effective structure, low cost, realizes the functional reuse of DC-DC constant current circuit, and greatly reduces circuit cost. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] The module consists of: 1. Constant current circuit module; 2. Signal input module; 3. Current setting switching module; 4. Load switching switch module; 5. First load module; 6. Second load module. Detailed Implementation

[0023] according to Figure 1 This utility model is a DC-DC constant current drive multiplexing circuit, including a constant current circuit module 1, a signal input module 2 connected to the constant current circuit module 1, a current setting switching module 3, a load switching switch module 4, a first load module 5, and a second load module 6.

[0024] The signal input module is connected to the constant current circuit module, the current setting switching module, the load switching switch module, the first load module, and the second load module, respectively; the load switching switch module is connected to the first load module and the second load module, respectively.

[0025] The current setting switching module includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1;

[0026] The base of the first transistor Q1 is connected to the signal input module and the base of the third transistor Q3. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the fourth resistor R4, and one end of the first capacitor C1 to form a voltage output control terminal, which is connected to the constant current circuit module. The other end of the fourth resistor R4 is the voltage input terminal. The other end of the first capacitor C1 is connected to the constant current circuit module. The other end of the second resistor R2 is connected to the collector of the second transistor Q2. The emitter of the second transistor Q2 is grounded. The base of the second transistor Q2 is connected to one end of the third resistor R3 and the collector of the third transistor Q3. The other end of the third resistor R3 is the voltage input terminal. The emitter of the third transistor Q3 is grounded.

[0027] The load switching module includes a fourth transistor Q4, a fifth transistor Q5, a sixth MOSFET Q6, a seventh MOSFET Q7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4.

[0028] The base of the fourth transistor Q4 is connected to the signal input module, and the emitter of the fourth transistor Q4 is grounded. The collector of the fourth transistor Q4 is connected to the base of the fifth transistor Q5, one end of the sixth resistor R6, and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to one end of the second capacitor C2, the voltage input terminal, and the emitter of the fifth transistor Q5. The other end of the second capacitor C2 is grounded. The other end of the sixth resistor R6 is connected to one end of the third capacitor C3 and the gate of the seventh MOSFET Q7. The other end of C3 is grounded; the source of the seventh MOSFET Q7 is grounded, and the drain of the seventh MOSFET Q7 is connected to the first load module; the collector of the fifth transistor Q5 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, one end of the fourth capacitor C4, and the gate of the sixth MOSFET Q6; the other end of the eighth resistor R8 is grounded, the other end of the fourth capacitor C4 is grounded, the source of the sixth MOSFET Q6 is grounded, and the drain of the sixth MOSFET Q6 is connected to the second load module.

[0029] The first load module and the second load module each include a series LED string.

[0030] The signal input module includes a first signal input terminal, a second signal input terminal, a first diode D, a second diode D2, a third diode D3, a first Zener diode Z1, a ninth resistor R9, and a fifth capacitor C5;

[0031] The first signal input terminal corresponds to the first load module, and the second signal input terminal corresponds to the second load module. The first signal input terminal is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and connected to the constant current circuit module, the anode of the second diode D2 is connected to the second signal input terminal and the anode of the third diode D3, respectively. The cathode of the third diode D3 is connected to the cathode of the first Zener diode Z1, the anode of the first Zener diode Z1 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to one end of the fifth capacitor C5, the current setting switching module, and the load switching switch module, respectively.

[0032] The constant current circuit module includes chip U1, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14, fifteenth capacitor C15, eighth MOSFET Q8, first inductor L1, second inductor L2, Schottky diode D4, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, and sixteenth resistor R16; chip U1 includes VIN pin, PWM pin, IMON pin, IADJ pin, RAMP pin, SS pin, DM pin, RT pin, COMP pin, GATE pin, IS pin, GND pin, CSP pin, CSN pin, OVP pin, SLOPE pin, VREF pin, VCC pin, and EP pin;

[0033] The VIN pin of chip U1 is connected to the signal input module, one end of the sixth capacitor C6, and one end of the first inductor L1. The other end of the sixth capacitor C6 is grounded. The other end of the first inductor L1 is connected to the drain of the eighth MOSFET Q8 and one end of the seventh capacitor C7. The gate of the eighth MOSFET Q8 is connected to the GATE pin. The source of the eighth MOSFET Q8 is connected to the IS pin and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to the GND pin and then grounded. The other end of the seventh capacitor C7 is connected to the... One end of the second inductor L2 is connected to the positive terminal of the Schottky diode D4, and the other end of the second inductor L2 is grounded; the negative terminal of the Schottky diode D4 is connected to one end of the eleventh resistor R11, one end of the eighth capacitor C8, the CSP pin, and one end of the tenth resistor R10; the other end of the eighth capacitor C8 is grounded, and the other end of the tenth resistor R10 is connected to the CSN pin, the first load module, and the second load module; the other end of the eleventh resistor R11 is connected to the OVP pin and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.

[0034] The SLOPE pin is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is connected to one end of the fifteenth capacitor C15 and the EP pin of the fourteenth capacitor C14, and then grounded. The other end of the fourteenth capacitor C14 is connected to the VCC pin. The other end of the fifteenth capacitor C15 is connected to the VREF pin and the voltage input terminal, respectively.

[0035] One end of the sixteenth resistor R16 is the voltage input terminal, and the other end is connected to the PWM pin; the IMON pin is connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is connected to the current setting switching module, one end of the tenth capacitor C10, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, one end of the fifteenth resistor R15, and one end of the thirteenth capacitor C13, and then grounded; the other end of the thirteenth capacitor C13 is connected to the COMP pin; the other end of the fifteenth resistor R15 is connected to the RT pin, the other end of the twelfth capacitor C12 is connected to the DM pin, the other end of the eleventh capacitor C11 is connected to the SS pin, and the other end of the tenth capacitor C10 is connected to the RAMP pin.

[0036] When using this utility model, taking a logo light as an example, different colors need to be displayed to reflect different driving states of the vehicle. The logo mode is the normal driving state, which is displayed in red, and the ADS mode is the intelligent driving system control state, which is displayed in cyan. The ADS has a higher priority than the LOGO.

[0037] The first signal input terminal of the signal input module is the logo signal input terminal, and the second signal input terminal is the ADS signal input terminal.

[0038] The constant current circuit module described above enables switching control between two different functions and different output currents. The chip U1 can be a TI TPS92692, and the output current value can be set by adjusting the voltage Va at pin 9 of chip U1.

[0039] The current setting module generates different point a voltages at the voltage output control terminal by turning on the first resistor R1 or the second resistor R2 to ground respectively, thereby achieving output current switching.

[0040] The load switching module achieves switching between different loads by connecting the first load module and the second load module to ground respectively.

[0041] Logo mode:

[0042] The input signal is a logo, with no ADS signal. Chip U1 generates a +5V reference voltage. In the current setting module, due to the lack of an ADS signal, the first transistor Q1 and the third transistor Q3 are cut off, the first resistor R1 is open to ground, the second transistor Q2 is on, and the second resistor R2 is on to ground. The voltage at point a is the voltage division generated by the second resistor R2 and the fourth resistor R4, setting the target current value for the logo. Simultaneously, in the load switching module, due to the lack of an ADS signal, Q8 is cut off, causing MOSFET Q5 to conduct, connecting the red logo LED load to ground. The fourth transistor Q4 is cut off, causing the fifth transistor Q5 and the sixth MOSFET Q6 to cut off, disconnecting the second load module, i.e., the cyan ADS LED load, from ground.

[0043] ADS mode:

[0044] When the LOGO function is active, the ADS signal is also connected. Due to the connection of the ADS signal, the first transistor Q1 and the third transistor Q3 in the current setting module are turned on, the second transistor Q2 is turned off, the first resistor R1 is connected to ground, and the second resistor R2 is open to ground. The voltage at point a is the voltage division of the first resistor R1 and the fourth resistor R4, which is the target current setting state in ADS mode.

Claims

1. A DC-DC constant current drive multiplexing circuit, characterized in that: The system includes a constant current circuit module, a signal input module connected to the constant current circuit module, a current setting switching module, a load switching module, a first load module, and a second load module; the signal input module is connected to the constant current circuit module, the current setting switching module, the load switching module, the first load module, and the second load module; the load switching module is connected to the first load module and the second load module. The current setting switching module includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1; The base of the first transistor Q1 is connected to the signal input module and the base of the third transistor Q3. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the fourth resistor R4, and one end of the first capacitor C1 to form a voltage output control terminal, which is connected to the constant current circuit module. The other end of the fourth resistor R4 is the voltage input terminal. The other end of the first capacitor C1 is connected to the constant current circuit module. The other end of the second resistor R2 is connected to the collector of the second transistor Q2. The emitter of the second transistor Q2 is grounded. The base of the second transistor Q2 is connected to one end of the third resistor R3 and the collector of the third transistor Q3. The other end of the third resistor R3 is the voltage input terminal. The emitter of the third transistor Q3 is grounded. The load switching module includes a fourth transistor Q4, a fifth transistor Q5, a sixth MOSFET Q6, a seventh MOSFET Q7, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The base of the fourth transistor Q4 is connected to the signal input module, and the emitter of the fourth transistor Q4 is grounded. The collector of the fourth transistor Q4 is connected to the base of the fifth transistor Q5, one end of the sixth resistor R6, and one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to one end of the second capacitor C2, the voltage input terminal, and the emitter of the fifth transistor Q5. The other end of the second capacitor C2 is grounded. The other end of the sixth resistor R6 is connected to one end of the third capacitor C3 and the gate of the seventh MOSFET Q7. The other end of C3 is grounded; the source of the seventh MOSFET Q7 is grounded, and the drain of the seventh MOSFET Q7 is connected to the first load module; the collector of the fifth transistor Q5 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, one end of the fourth capacitor C4, and the gate of the sixth MOSFET Q6; the other end of the eighth resistor R8 is grounded, the other end of the fourth capacitor C4 is grounded, the source of the sixth MOSFET Q6 is grounded, and the drain of the sixth MOSFET Q6 is connected to the second load module.

2. The DC-DC constant current drive multiplexing circuit according to claim 1, characterized in that: The first load module and the second load module each include a series LED string.

3. The DC-DC constant current drive multiplexing circuit according to claim 1, characterized in that: The signal input module includes a first signal input terminal, a second signal input terminal, a first diode D, a second diode D2, a third diode D3, a first Zener diode Z1, a ninth resistor R9, and a fifth capacitor C5; The first signal input terminal corresponds to the first load module, and the second signal input terminal corresponds to the second load module. The first signal input terminal is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2 and connected to the constant current circuit module, the anode of the second diode D2 is connected to the second signal input terminal and the anode of the third diode D3, respectively. The cathode of the third diode D3 is connected to the cathode of the first Zener diode Z1, the anode of the first Zener diode Z1 is connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is connected to one end of the fifth capacitor C5, the current setting switching module, and the load switching switch module, respectively.

4. The DC-DC constant current drive multiplexing circuit according to claim 1, characterized in that: The constant current circuit module includes chip U1, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14, fifteenth capacitor C15, eighth MOSFET Q8, first inductor L1, second inductor L2, Schottky diode D4, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, and sixteenth resistor R16; chip U1 includes VIN pin, PWM pin, IMON pin, IADJ pin, RAMP pin, SS pin, DM pin, RT pin, COMP pin, GATE pin, IS pin, GND pin, CSP pin, CSN pin, OVP pin, SLOPE pin, VREF pin, VCC pin, and EP pin; The VIN pin of chip U1 is connected to the signal input module, one end of the sixth capacitor C6, and one end of the first inductor L1. The other end of the sixth capacitor C6 is grounded. The other end of the first inductor L1 is connected to the drain of the eighth MOSFET Q8 and one end of the seventh capacitor C7. The gate of the eighth MOSFET Q8 is connected to the GATE pin. The source of the eighth MOSFET Q8 is connected to the IS pin and one end of the thirteenth resistor R13. The other end of the thirteenth resistor R13 is connected to the GND pin and then grounded. The other end of the seventh capacitor C7 is connected to the... One end of the second inductor L2 is connected to the positive terminal of the Schottky diode D4, and the other end of the second inductor L2 is grounded; the negative terminal of the Schottky diode D4 is connected to one end of the eleventh resistor R11, one end of the eighth capacitor C8, the CSP pin, and one end of the tenth resistor R10; the other end of the eighth capacitor C8 is grounded, and the other end of the tenth resistor R10 is connected to the CSN pin, the first load module, and the second load module; the other end of the eleventh resistor R11 is connected to the OVP pin and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded. The SLOPE pin is connected to one end of the fourteenth resistor R14. The other end of the fourteenth resistor R14 is connected to one end of the fifteenth capacitor C15 and the EP pin of the fourteenth capacitor C14, and then grounded. The other end of the fourteenth capacitor C14 is connected to the VCC pin. The other end of the fifteenth capacitor C15 is connected to the VREF pin and the voltage input terminal, respectively. One end of the sixteenth resistor R16 is the voltage input terminal, and the other end is connected to the PWM pin; the IMON pin is connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is connected to the current setting switching module, one end of the tenth capacitor C10, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, one end of the fifteenth resistor R15, and one end of the thirteenth capacitor C13, and then grounded; the other end of the thirteenth capacitor C13 is connected to the COMP pin; the other end of the fifteenth resistor R15 is connected to the RT pin, the other end of the twelfth capacitor C12 is connected to the DM pin, the other end of the eleventh capacitor C11 is connected to the SS pin, and the other end of the tenth capacitor C10 is connected to the RAMP pin.

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