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PDF CS3717AGNF16 Data sheet ( Hoja de datos )
| Número de pieza | CS3717AGNF16 | |
| Descripción | 1A H-Bridge Stepper Motor Driver | |
| Fabricantes | Cherry Semiconductor Corporation | |
| Logotipo |  |
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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.
Absolute Maximum Ratings
Power Supply Voltage (VDDA, VDDB) ............................................................50V
Logic Supply Voltage (VCC)..............................................................................7V
Logic Input Voltage (IN0, IN1, DIRECTION)................................................6V
Comparator Input............................................................................................VCC
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
VDDA OUTA OUTB VDDB
VCC
VREF
Gnd
6KW
223W
223W
105W
00 01 10 11
+
-
+
-
+ MONO-
- STABLE
THERMAL
SHUTDOWN
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
16L PDIP
(Internally Fused Leads)
OUTB 1
Pulse
VDDB
Gnd
Gnd
VCC
IN1
DIRECTION
Sense
OUTA
VDDA
Gnd
Gnd
VREF
Comp In
IN0
Comp In
Rev. 4/29/99
Pulse
Sense
1
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
A Company
¨
1 page  
Application Information: continued
For rotation in the other direction the sequence must be
reversed.
The torque of each step is constant in full step operation.
Half step operation
Power is applied alternately to one winding then both
according to the sequence:
AB®B®AB®A®AB®B®AB®A etc.
Like full step this can be done at any current level; the
torque is not constant but is lower when only one winding
is energized.
A coil is turned off by setting IN0 and IN1 both high.
Quarter step operation
It is preferable to realize the quarter step operation at full
power otherwise the steps will be of very irregular size.
The extra quarter steps are added to the half step
sequence by putting one coil on half current according to
the sequence.
AB®A2 B®B®A2B®AB®AB2®A etc.
Motor selection
As the CS3717A provides constant current drive with a
switching operation, care must be taken to select stepper
motors with low hysteresis losses to prevent motor over-
heating.
L-C filter
To reduce EMI and chopping losses in the motor, a low
pass L-C filter can be inserted across the outputs of the
CS3717A as shown in the following diagram.
Input and Output Sequences for Half Step and Full Step Operation
OUTA
CS3717A
OUTB
L@
1
10
LM
L
C
MOTOR
WINDING
(LM, RM)
C @ 4 ¥ 1010
L
STAND BY WITH
HOLDING TORQUE
1M = 80mA
IN0A
IN1A
1
HALF STEP MOTOR DRIVE
1M = 250mA
2345678
FULL STEP MOTOR DRIVE
1M = 500mA
IN
DIRECTIONA
DIRECTIONB
IN0B
IN1B
500 mA
OUT
IMA
- 500 mA
500 mA
IMB
- 500 mA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CS3717AGNF16.PDF ] | |
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