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LMD18245 3A, 55V DMOS Full-Bridge Motor Driver

April 1998

LMD18245

3A, 55V DMOS Full-Bridge Motor Driver

General Description

The LMD18245 full-bridge power amplifier incorporates all

the circuit blocks required to drive and control current in a

brushed type DC motor or one phase of a bipolar stepper

motor. The multi-technology process used to build the device

combines bipolar and CMOS control and protection circuitry

with DMOS power switches on the same monolithic struc-

ture. The LMD18245 controls the motor current via a fixed

off-time chopper technique.

An all DMOS H-bridge power stage delivers continuous out-

put currents up to 3A (6A peak) at supply voltages up to 55V.

The DMOS power switches feature low R

DS(ON)

for high ef-

ficiency, and a diode intrinsic to the DMOS body structure

eliminates the discrete diodes typically required to clamp bi-

polar power stages.

An innovative current sensing method eliminates the power

loss associated with a sense resistor in series with the motor.

A four-bit digital-to-analog converter (DAC) provides a digital

path for controlling the motor current, and, by extension, sim-

plifies implementation of full, half and microstep stepper mo-

tor drives. For higher resolution applications, an external

DAC can be used.

Features

n

n

n

n

n

n

n

n

n

n

DMOS power stage rated at 55V and 3A continuous

Low R

DS(ON)

of typically 0.3鈩?per power switch

Internal clamp diodes

Low-loss current sensing method

Digital or analog control of motor current

TTL and CMOS compatible inputs

Thermal shutdown (outputs off) at T

J

= 155藲C

Overcurrent protection

No shoot-through currents

15-lead TO-220 molded power package

Applications

n

Full, half and microstep stepper motor drives

n

Stepper motor and brushed DC motor servo drives

n

Automated factory, medical and office equipment

Functional Block and Connection Diagram

(15-Lead TO-220 Molded Power Package (T) )

DS011878-1

Order Number LMD18245T

See NS Package Number TA15A

漏 1998 National Semiconductor Corporation

DS011878

www.national.com

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