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1
Features
THERMAL
SHUTDOWN
V
DDA
Pulse
Comp In
Sense
OUTA OUTBV
DDB
DIRECTION
IN1
IN0
V
CC
V
REF
Gnd
+
-
+
-
+
-
MONO-
STABLE
105
W
223
W
223
W
6K
W
00
01
10
11
I
Full/Half /Quarter Step
Operation
Output Current Up to 1 A
Motor Supply Voltage 10V
to 46V
Integrated Bootstrap
Lowers Saturation Voltage
Built In Protection Diodes
Externally Selectable
Current Level
Digital or Analog Control
of Output Current Level
Thermal Overload
Protection
Minimum External
Components
I
I
I
I
I
I
I
I
Package Options
C
1A H-Bridge Stepper Motor Driver
Description
CS3717A
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
CS3717As and several external
components form a complete step-
per motor drive subsystem.
The recommended operating ambi-
ent temperature range is from 0 to
70C.
The CS3717A is supplied in a 16
lead PDIP.
Block Diagram
16L PDIP
(Internally Fused Leads)
1
OUTB
Pulse
V
DD
B
Gnd
V
CC
IN1
DIRECTION
Sense
OUTA
V
DD
A
Gnd
Gnd
V
REF
Comp In
IN0
Gnd
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 .................................................................D55C to +150C
Operating Junction Temperature.............................................D40C to +150C
Lead Temperature Soldering
Wave Solder(through hole styles only)............10 sec. max, 260C 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