1

Features

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

Block Diagram

16L PDIP

(Internally Fused Leads)

1

OUTB

Pulse

B

Gnd

IN1

DIRECTION

Sense

OUTA

A

Gnd

Gnd

Comp In

IN0

Gnd

December, 2001 - Rev. 4

ON Semiconductor

2000 South County Trail, East Greenwich, RI 02818

Tel: (401)885–3600 Fax: (401)885–5786

N. American Technical Support: 800-282-9855

Web Site: www.cherry–semi.com

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 insertion

of a sensing resistor. Two CS3717A’s

and several external components

form a complete stepper motor drive

subsystem.

The recommended operating ambient

temperature range is from 0° to 70°C.

The CS3717A is supplied in a 16 lead

PDIP.

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

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

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

Storage Temperature .................................................................–55°C to +150°C

Operating Junction Temperature ............................................–40°C to +150°C

Lead Temperature Soldering

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

Absolute Maximum Ratings

THERMAL

SHUTDOWN

A

Pulse

Comp In

Sense

DIRECTION

IN1

IN0

Gnd

+

-

+

-

+

-

MONO-

STABLE

105

Ω

223

Ω

223

Ω

6K

Ω

00

01

10

11