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Description

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 multiplexed system. Digital input control eliminates the need for any analog calibration of the gauge.

The controlling microprocessor sends out a PWM signal to each H bridge driver input (IN1, IN2). The PWM signal duty cycle is proportional to the HÐbridge output. Output current (100mA max) direction is controlled by the DIRECTION input. PWM switching 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.

Features

■ 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