Friday, September 6, 2013

Bipolar Stepper Motor Driver Circuit with LMD18245

Introduction

For some time I have been planning to build a number of devices that make use of stepper motors. Since I have no experience in using stepper motors I had no idea what parts, what driver and controller circuits I would need to get them running.

After extensive research  on the internet I decided to make a bipolar stepper motor driver based on Texas Instuments' LMD18245, which is a 3A, 55V DMOS Full-Bridge Motor Driver. It incorporates all the circuit blocks required to drive and control current in a bipolar stepper motor.

This integrated circuit is a bit more involved to program (although surprisingly simple compared to what it delivers) but comes with many extra features (for free), such as overcurrent protection and thermal shutdown.