DISCONTINUED

PRODUCT

—

FOR

REFERENCE

ONL

Y.

Use

UDN2917EB

for

new

design

The A2918SWH and A2918SWV motor drivers are designed

to drive both windings of a bipolar stepper motor or bidirectionally

control two dc motors. All bridges are capable of sustaining 45 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. A PHASE input to each bridge determines load current

direction. Active low ENABLE inputs control the four drivers in

each bridge.

The bridges include both ground clamp and flyback diodes for

protection against inductive transients. 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 A2918SWH/V are supplied in an 18-lead power-tab package

with staggered lead forming. The tab is internally insulated from the

device and requires no external isolation. The A2918SWH/V are

available for operation from -40

°C to +85°C. To order, change the

suffix from 'S–' to 'E–'. These devices are also available on special

order for operation to +125

°C.

FEATURES

I ±1.5 A Continuous Output Current

I 45 V Output Sustaining Voltage

I Internal PWM Current Control

I Low Output Saturation Voltage

I Internal Clamp Diodes

I Internal Thermal Shutdown Circuitry

I Similar to Dual PBL3718 or Dual PBL3770

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

ABSOLUTE MAXIMUM RATINGS

≤ +150°C

≤20 µs) . .

(Continuous) . . . . . . . . . . . . . .

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.

Always order by complete part number:

Part Number

Application

A2918SWH

For Horizontal Mount

A2918SWV

For Vertical Mount

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Dwg. PP-051

OUT1A

OUT1B

OUT2A

OUT2B

E1

E2

SENSE1

SENSE2

GROUND

REFERENCE

LOGIC SPLY

LOAD SPLY

ENABLE1

ENABLE2

RC1

RC2

PHASE1

PHASE2

2918