This driver uses chips BTS7960 composed of high-power drive full H-bridge driver module with thermal over-current protection. Double BTS7960 H-bridge driver circuit, with a strong drive and , effectively isolating the microcontroller and motor driver! High-current 43A Double BTS7960 large current (43 A) H bridge driver 5V isolate with MCU, and effectively protect MCU 5V power indicator on board voltage indication of motor driver output end can solder heat sink PIN Definition: 1. RPWM: Right Turn PWM 2. LPWM: Left Turn PWM 3. R_EN: Right Turn Enable (High Active) 4. L_EN: Left Turn Enable (High Active) 5. R_IS: Right Turn Current Warning (May Leave Floating) 6. L_IS: Left Turn Current Warning (May Leave Floating) 7. VCC: (5V) 8. GND Connections: 1: VCC: 5V from Microcontroller(MCU) GND: GND from Microcontroller(MCU) L_PWM: PWM or 5V from Microcontroller(MCU) for CCW(CW) Turns R_PWM: PWM or 5V from Microcontroller(MCU) for CW(CCW) Turns R_EN and L_EN: 5V from Microcontroller(MCU) 2: VCC: 5V from Microcontroller(MCU) GND: GND from Microcontroller(MCU) L_PWM: 5V from Microcontroller(MCU) for CCW(CW) Turns R_PWM: 5V from Microcontroller(MCU) for CW(CCW) Turns R_EN and L_EN: PWM from Microcontroller(MCU) Just need four lines from MCU to driver module (GND. 5V. PWM1. PWM2) isolation chip 5 V power supply (can share with MCU 5 V) to reverse the motor forward, two PWM input frequency up to 25kHZ two heat flow passing through an error signal output isolated chip 5V power supply (can be shared with the MCU 5V), can also use the on-board 5V supply the supply voltage 5.5V to 27V Colour:blueandblack Material:PCB Size:4 x 5 x 1.2cm Package Contents: 2 x BTS7960B H-bridge 43A High-Power Motor Driver Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.