2927

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

DISCONTINUED

PRODUCT

—

FOR

REFERENCE

ONL

Y

GND

GND

GND

GND

7

8

9

10

11

12

13

14

15

16

17

29

30

39

38

37

36

35

34

33

32

31

Dwg. PP-021

1

2

PWM 1

PWM 2

The A2927SEB motor driver is designed to drive both windings of a

bipolar stepper motor or bidirectionally control two dc motors. Both

bridges are capable of sustaining 50 V and include internal pulse-width

modulation (PWM) control of the output current to 1.5 A.

For PWM current control, the maximum output current is determined

by the user’s selection of a reference voltage and sensing resistor. Two

logic-level inputs select output current limits of 0, 33%, 67%, or 100%

of the maximum level. A PHASE input to each bridge determines load

current direction. Active-low ENABLE inputs control the four drivers in

each bridge.

Internally generated delays prevent cross-over currents when

switching current direction. Special power-up sequencing is not required.

Thermal protection circuitry disables the outputs if the chip temperature

exceeds safe operating limits.

The A2927SEB is supplied in a 44-lead power PLCC for surface-

mount applications. Its batwing construction provides for maximum

package power dissipation in the smallest possible construction.

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

Always order by complete part number: A2927SEB .

FEATURES

2927

PRELIMINARY INFORMATION

(Subject to change without notice)

September 16, 1997

ABSOLUTE MAXIMUM RATINGS

at T

Logic Input Voltage Range,

Package Power Dissipation,

Operating Temperature Range,

Storage Temperature Range,

Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the specified peak

current rating or a junction temperature of +150

°C.