Brushed DC Motor Driver with Integrated Current Regulation

The highly efficient DC brushed motor driver including an onboard shunt resistor for current regulation presented here is built using the DRV8251 chip. The operating supply voltage range of the project is 4.5V to 48V DC and the default output current capability is 2.1A. A trimmer potentiometer PR1 is provided to adjust the current regulation threshold. The device includes under-voltage lockout (UVLO), Latched overcurrent protection (OCP), and thermal shutdown (TSD). Output is disabled and latched when over current/stall current condition occurs. For direction control of the motor use IN1 and IN2 as logic inputs and for speed control these inputs can be connected to a PWM source with duty cycle 0 to 100% and frequency 20Khz.