
1
Features
OUT1A
Thermal
Shutdown
V
REF
Overvoltage
1/2 H -Bridge
Driver
with Current
Limit
RC Filter
for PWM Input
OUT1B
C1
1/2 H -Bridge
Driver
with Current
Limit
DIRECTION
Control
1/2 H- Bridge
Driver
with Current
Limit
RC Filter
for PWM Input
1/2 H- Bridge
Driver
with Current
Limit
DIRECTION
Control
OUT2A
OUT2B
C2
Gnd
IN2
DIR2
IN1
DIR1
V
S1,2
I
2 Independent NPN
H-Bridge Drivers
No Analog Trim Required
Used in Multiplexed
Systems
Quiet Gauge Operation
Programmable Slew
Rate Minimizes
Switching Noise
Fault Protection
Over Voltage
Thermal Shutdown
Short Circuit
I
I
I
I
I
Package Options
16 Lead PDIP
(internally fused leads)
C
100mA Dual H-Bridge Air-Core
Gauge Driver
Description
1
DIR1
C1
IN1
Gnd
Gnd
OUT1A
VS1
OUT1B
DIR2
C2
IN2
Gnd
Gnd
OUT2A
VS2
OUT2B
Block Diagram
Absolute Maximum Ratings
The CS3750 is a dual H-bridge four
quadrant air-core gauge driver. The IC
provides all the functions necessary to
drive a tachometer or speedometer as
part of a microprocessor based multi-
plexed system. Digital input control
eliminates the need for any analog cali-
bration of the gauge.
The controlling microprocessor sends
out a PWM signal to each H bridge
driver input (IN1, IN2). The PWM sig-
nal duty cycle is proportional to the
HDbridge output. Output current
(100mA max) direction is controlled by
the DIRECTION input. PWM switch-
ing noise is minimized at each half
bridge by an internal RC filter and
external programmable capacitor.
The CS3750 is protected against 50V
load dump, over voltage and thermal
runaway fault conditions. Any of these
faults causes the IC to shut down. Each
high side of the output driver is current
limited. A short circuit condition in one
driver does not affect the others.
CS3750
Supply Voltage.................................................................................7.5V to +16V
Internal Power Dissipation.....................................................Internally limited
Logic Input Voltages.......................................................................D0.3V to 6.5V
Junction Temperature Range ...................................................D40C to +150C
Storage Temperature Range.....................................................D55C to +165C
Lead Temperature Soldering
Wave Solder (through hole styles only)...........10 sec. max, 260C peak
Electrostatic Discharge (Human Body Model)............................................8kV
Rev. 7/20/95
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
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