1

Features

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2 Independent NPN

H-Bridge Drivers

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No Analog Trim Required

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Used in Multiplexed

Systems

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Quiet Gauge Operation

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Programmable Slew

Rate Minimizes

Switching Noise

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Fault Protection

Over Voltage

Thermal Shutdown

Short Circuit

Package Options

16 Lead PDIP

(internally fused leads)

100mA Dual H-Bridge Air-Core

Gauge Driver

1

DIR1

C1

IN1

Gnd

Gnd

OUT1A

VS1

OUT1B

DIR2

C2

IN2

Gnd

Gnd

OUT2A

VS2

OUT2B

Description

Block Diagram

Absolute Maximum Ratings

CS3750

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 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

H–bridge 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.

Supply Voltage.................................................................................................16V

Internal Power Dissipation.....................................................Internally limited

Logic Input Voltages .......................................................................–0.3V to 6.5V

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

Storage Temperature Range .....................................................–55°C to +165°C

Lead Temperature Soldering

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

Electrostatic Discharge (Human Body Model)............................................4kV

OUT1A

Thermal

Shutdown

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