UC3717A Stepper Motor Drive Circuit

Description

The UC3717A is a highly integrated solution designed to simplify the complexities of driving bipolar stepper motors. For hobbyists working on robotics, CNC machines, or precision 3D printer builds, this IC acts as a bridge between your low-power microcontroller and a high-current motor. It features a complete LS-TTL compatible logic interface, a current-regulating PWM chopper, and a robust H-bridge output stage. Unlike basic drivers, the UC3717A allows for precise control of motor current through its internal circuitry, ensuring smooth motion and protecting your motors from overheating. Housed in a convenient through-hole package, it is perfect for breadboarding and DIY PCB assembly.

FEATURES

• Full H-Bridge output stage for driving one winding of a bipolar stepper motor.

• Internal PWM current control (chopper) for high efficiency and precision.

• Wide supply voltage range supporting motor voltages up to 40V.

• High output current capability of up to 1A continuous (1.2A peak).

• LS-TTL compatible logic inputs for easy interfacing with Arduino, ESP32, or MSP430.

• Integrated "Half-Step" and "Full-Step" capability via 2-bit current level control.

• Built-in protection diodes and thermal shutdown for enhanced durability.

Applications

• DIY CNC machines and 3D printers.

• Robotics and automated motion control systems.

• Precision telescope mounts and camera sliders.

• Laboratory equipment and small industrial actuators.

• Microprocessor-controlled stepper motor systems.

Parameters

• Motor Supply Voltage (Vmm): 10V to 40V.

• Logic Supply Voltage (Vcc): 4.75V to 5.25V.

• Continuous Output Current: 1.0A.

• Peak Output Current: 1.2A.

• Logic Input Voltage: -0.3V to 7V.

• Reference Input Voltage: 0V to 5V.

• Operating Temperature: 0°C to 70°C.

• Package Type: Through-hole (DIP/PDIP).