LMD18201

3A, 55V H-Bridge

General Description

The LMD18201 is a 3A H-Bridge designed for motion control

applications. The device is built using a multi-technology pro-

cess which combines bipolar and CMOS control circuitry

with DMOS power devices on the same monolithic structure.

The H-Bridge configuration is ideal for driving DC and step-

per motors. The LMD18201 accommodates peak output cur-

rents up to 6A. Current sensing can be achieved via a small

sense resistor connected in series with the power ground

lead. For current sensing without disturbing the path of cur-

rent to the load, the LMD18200 is recommended.

Features

n Delivers up to 3A continuous output

n Operates at supply voltages up to 55V

n TTL and CMOS compatible inputs

n No “shoot-through” current

n Thermal warning flag output at 145˚C

n Thermal shutdown (outputs off) at 170˚C

n Internal clamp diodes

n Shorted load protection

n Internal charge pump with external bootstrap capability

Applications

n DC and stepper motor drives

n Position and velocity servomechanisms

n Factory automation robots

n Numerically controlled machinery

n Computer printers and plotters

Functional Diagram

DS010793-1

FIGURE 1. Functional Block Diagram of LMD18201

April 1998

© 1999 National Semiconductor Corporation

DS010793

www.national.com