1

Features

THERMAL

SHUTDOWN

A

Pulse

Comp In

Sense

DIRECTION

IN1

IN0

Gnd

+

-

+

-

+

-

MONO-

STABLE

105

W

223

W

223

W

6K

W

00

01

10

11

s

Full/Half /Quarter Step

Operation

s

Output Current Up to 1 A

s

Motor Supply Voltage 10V

to 46V

s

Integrated Bootstrap

Lowers Saturation Voltage

s

Built In Protection Diodes

s

Externally Selectable

Current Level

s

Digital or Analog Control

of Output Current Level

s

Thermal Overload

Protection

s

Minimum External

Components

Package Options

1A H-Bridge Stepper Motor Driver

CS3717A

Description

The CS3717A controls and drives

one phase of a bipolar stepper

motor with chopper control of the

phase current. Current levels may

be selected in three steps by means

of two logic inputs which select one

of three current comparators. When

both of these inputs are high the

device is disabled. A separate logic

input controls the direction of cur-

rent flow. A monostable, pro-

grammed by an external RC net-

work, sets the current decay time.

The power section is a full H-bridge

driver with four internal clamp

diodes for current recirculation. An

external connection to the lower

emitters is available for the inser-

tion of a sensing resistor. Two

CS3717AÕs and several external

components form a complete step-

per motor drive subsystem.

The recommended operating ambi-

ent temperature range is from 0 to

70¡C.

The CS3717A is supplied in a 16

lead PDIP.

Block Diagram

16L PDIP

(Internally Fused Leads)

1

OUTB

Pulse

B

Gnd

IN1

DIRECTION

Sense

OUTA

A

Gnd

Gnd

Comp In

IN0

Gnd

Logic Input Voltage (IN0, IN1, DIRECTION)................................................6V

Reference Input Voltage..................................................................................15V

Output Current (DC Operation)...................................................................1.2A

Storage Temperature .................................................................Ð55¡C to +150¡C

Operating Junction Temperature.............................................Ð40¡C to +150¡C

Lead Temperature Soldering

Wave Solder(through hole styles only) ............10 sec. max, 260¡C peak

Absolute Maximum Ratings

Cherry Semiconductor Corporation

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885-3600 Fax: (401)885-5786

Email: info@cherry-semi.com

Web Site: www.cherry-semi.com

A

Company

¨

Rev. 4/29/99