JGA25-370 Onboard Motor Driver DRV8251

This is an easy to use motor driver board that you can solder directly to the back of any compatible JGA25-370 brushed DC motor. The board is based around the DRV8251 H-Bridge motor driver, allowing for a 3.7A peak current (~2.3A continuous) and 4.5V-48V supply voltage range. This driver can be used for almost any brushed DC motor by connecting the two output terminals to the motor terminals directly, or through wires. There are also two helpful indicator LEDs on each control input line.

Use the driver by soldering the two oval output terminals either directly to the terminals on your motor, or using two wires. Then connect 4.5V-48V to the + pin, connect GND to the – pin, and connect two control inputs to IN1 and IN2. You can use PWM signals on both IN1 and IN2 for motor speed control. Note that whatever motor terminal is connected to which output terminal does not matter, it will only change the direction of the motor if flipped.

Your logic voltage supply should also be connected to the VREF pin to enable the current limit. At 5V, the current limit will be ~2.3A, and at 3.3V the current limit will be ~1.5A. You can calculate the current limit by dividing the voltage by 2.2. If you don’t want a current limit, then use a wire and/or solder to bridge across the “R220” shunt resistor. If this is done you will still need to provide your logic voltage on the VREF pin.

This motor driver can be controlled with 1.8V, 3.3V and 5V logic (1.5V-5.5V). The DRV8251 has built in overcurrent protection, thermal shutdown, and undervoltage lockout to protect itself and the motor. The diameter of a usable motor should be 24mm and the terminals be under 20mm apart at the furthest distance, and over 13mm apart at the shortest distance.

Note: motor shown in photos not included.