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UDN2916A

STEPPER MOTOR DRIVER

STMicroelectronics 

®

UDN2916A

STEPPER MOTOR DRIVER

ABLE TO DRIVE BOTH WINDINGS OF BIPO-

LAR STEPPER MOTOR

OUTPUT CURRENT UP TO 750mA EACH

WINDING

WIDE VOLTAGE RANGE 10V TO 50V

HALF-STEP, FULL-STEP AND MICROSTEPP-

ING MODE

BUILT-IN PROTECTION DIODES

INTERNAL PWM CURRENT CONTROL

LOW OUTPUT SATURATION VOLTAGE

DESIGNED FOR UNSTABILIZED MOTOR

SUPPLY VOLTAGE

INTERNAL THERMAL SHUTDOWN

DESCRIPTION

The UDN2916A is a bipolar monolithic integrated

circuits intended to control and drive both winding

of a bipolar stepper motor or bidirectionally con-

trol two DC motors.

The UDN2916A with a few external components

form a complete control and drive circuit for LS-

TTL or microprocessor controlled stepper motor

system.

The power stage is a dual full bridge capable of

sustaining 50V and including four diodes for cur-

rent recirculation.

BLOCK DIAGRAM

Powerdip 20+2+2

ORDERING NUMBER: UDN2916A

A cross conduction protection is provided to avoid

simultaneous cross conduction during switching

current direction.

An internal pulse-width-modulation (PWM) con-

trols the output current to 750mA with peak start-

up current up to 1A.

Wide range of current control from 750mA (each

bridge) is permitted by means of two logic inputs

and an external voltage reference. A phase input

to each bridge determines the load current direc-

tion.

A thermal protection circuitry disables the outputs

if the chip temperature exceeds safe operating

limits.

September 2003

1/8

notice.

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