Motor Driver Board Using DRV8243

The DRV8243 is a highly integrated brushed DC motor driver IC from Texas Instruments, designed to deliver efficient, reliable, and compact motor control for a wide range of industrial, automotive, and embedded applications. This project focuses on developing a motor driver board using the DRV8243P or DRV8243S variant, capable of driving a single brushed DC motor with a supply voltage range of 4.5V to 36V and a peak output current up to 6A.

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The DRV8243 is a motor driver IC from Texas Instruments, designed for driving brushed DC motors and solenoids. It is part of the DRV824x family, which offers integrated features to control motors efficiently in automotive, industrial, and other embedded applications.

Key Features of DRV8243:

1. Motor Type: Brushed DC motors
2. Voltage Range: Operates typically in the 4.5V to 36V range
3. Output Current: Supports up to 6 A peak current
4. Control Interface:
5. Can be configured for PWM (Pulse Width Modulation) control
6. PH/EN or IN/IN interface options
7. Protection Features:
8. Over-current protection (OCP)
9. Over-temperature protection (OTP)
10. Under-voltage lockout (UVLO)
11. Load-dump protection (automotive transients)
12. Diagnostic Feedback: Fault indication for system-level feedback
13. Low Standby Current: Efficient for battery-powered systems
14. Package: Typically offered in compact HTSSOP or QFN packages

Power Input:

1. VIN: 12V to 36V input
2. GND: Common ground
3. Capacitors:
4. 100nF + 10µF (ceramic) near VIN pin
5. 470µF electrolytic near input connector

DRV8243 Pins:

DRV8243 Pins:

1. IN1 / IN2 or PH / EN: Motor control (from MCU or logic pins)
2. nSLEEP: Tie HIGH for operation or control via MCU
3. nFAULT: Open-drain fault output (connect to MCU or LED)
4. MODE: Tie LOW for IN/IN or HIGH for PH/EN
5. IPROPI: Optional current sense output
6. OUT1/OUT2: Connect to motor terminals

Schematic Diagram of DRV8243

This motor driver circuit uses the Texas Instruments DRV8243 IC to control a brushed DC motor efficiently, with integrated protection and diagnostic features. The input power (12–36V DC) is filtered and protected using a TVS diode, bulk and bypass capacitors, and a AGM40P75 N-channel MOSFET configured for reverse polarity protection. The DRV8243 receives filtered power and drives the motor via its OUT1 and OUT2 pins, while control signals (PH/EN or IN1/IN2) from a microcontroller define motor direction and speed. Pull-up resistors are used for logic pins like MODE, nSLEEP, and nFAULT, while capacitors near VIN ensure stable operation. Optional current sensing is enabled via the IPROPI pin with a resistor to ground, and nFAULT can be monitored via an MCU or LED. The result is a compact, reliable, and robust motor driver board suitable for industrial, automotive, or robotics applications

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Applications:

1. Automotive seat and window actuators
2. Power tools
3. Robotics
4. Factory automation
5. Electric valves or pumps

Conclusion

This DRV8243-based motor driver board provides a compact, efficient, and protected solution for driving DC motors.

The design includes:

High-current H-Bridge (5.5A peak)

Adjustable current sensing (IPROPI)

Robust protection (OCP, OTP, UVLO)

Easy PWM control (Arduino-compatible)