CS3717A
CS3717A
1A H-Bridge Stepper Motor Driver
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.
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
Absolute Maximum Ratings
Power Supply Voltage (V
DDA
, V
DDB
) ............................................................50V
Logic Supply Voltage (V
CC
)..............................................................................7V
Logic Input Voltage (IN0, IN1, DIRECTION)................................................6V
Comparator Input............................................................................................V
CC
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
Block Diagram
IN0
IN1
DIRECTION
V
DDA
OUTA OUTB V
DDB
Package Options
16L PDIP
(Internally Fused Leads)
OUTB
Pulse
V
DD
B
1
Sense
OUTA
V
DD
A
V
CC
Gnd
Gnd
00
6KW
01
10
11
Gnd
Gnd
V
REF
Comp In
IN0
V
REF
+
-
223W
V
CC
IN1
DIRECTION
+
-
223W
+
-
MONO-
STABLE
105W
THERMAL
SHUTDOWN
Gnd
Comp In
Pulse
Sense
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
Rev. 4/29/99
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
