LMD18200 3A, 55V H-Bridge
December 1999
LMD18200
3A, 55V H-Bridge
General Description
The LMD18200 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.
Ideal for driving DC and stepper motors; the LMD18200 ac-
commodates peak output currents up to 6A. An innovative
circuit which facilitates low-loss sensing of the output current
has been implemented.
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No “shoot-through” current
Thermal warning flag output at 145˚C
Thermal shutdown (outputs off) at 170˚C
Internal clamp diodes
Shorted load protection
Internal charge pump with external bootstrap capability
Applications
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DC and stepper motor drives
Position and velocity servomechanisms
Factory automation robots
Numerically controlled machinery
Computer printers and plotters
Features
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Delivers up to 3A continuous output
Operates at supply voltages up to 55V
Low R
DS
(ON) typically 0.3Ω per switch
TTL and CMOS compatible inputs
Functional Diagram
DS010568-1
FIGURE 1. Functional Block Diagram of LMD18200
© 1999 National Semiconductor Corporation
DS010568
www.national.com
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