APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com

FEATURES

• DELIVERS UP TO 5A CONTINUOUS OUTPUT

• OPERATES AT SUPPLY VOLTAGES TO 55V

• TTL AND CMOS COMPATIBLE INPUTS

• NO “SHOOT-THROUGH” CURRENT

• THERMAL WARNING FLAG OUTPUT AT 145

° C

• THERMAL SHUTDOWN (OUTPUTS OFF) AT 160

° C

• INTERNAL CLAMP DIODES

• SHORTED LOAD PROTECTION

• INTERNAL CHARGE PUMP WITH EXTERNAL BOOTSTRAP

CAPABILITY

APPLICATIONS

• DC AND STEPPER MOTOR DRIVES

• POSITION AND VELOCITY SERVOMECHANISMS

• FACTORY AUTOMATION ROBOTS

• NUMERICALLY CONTROLLED MACHINERY

• COMPUTER PRINTERS AND PLOTTERS

PRELIMINARY

BLOCK DIAGRAM

HTTP://WWW.APEXMICROTECH.COM

(800) 546-APEX

(800) 546-2739

MICROTECHNOLOGY

PULSE WIDTH MODULATION AMPLIFIER

SA55

BRAKE

DIRECTION

PWM

ILIM

BRIDGE

DRIVER

THERMAL

FLAG

OUTPUT

BOOTSTRAP 1

BOOTSTRAP 2

GROUND

OUTPUT 1

OUTPUT 2

CURRENT

SENSE OUT

THERMAL

SENSING

UNDER

VOLTAGE

LOCKOUT

CHARGE

PUMP

DRIVE

CHARGE

PUMP

DRIVE

CURRENT

SENSING

DESCRIPTION

The SA55 is a 5A H-Bridge designed for motion control

applications. The device is built using a multi-technology

process which combines bipolar and CMOS control circuitry

with DMOS power devices on the same monolithic structure.

Ideal for driving DC and stepper motors; the SA55 accomodates

peak output currents up to 10A. An innovative circuit which

facilitates low-loss sensing of the output current has been

implemented.