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An H bridge is an electronic circuit that allows a voltage to be applied across a load, causing it to reverse the polarity of the motor or to brake the motor. The motor comes to a sudden stop when it brakes, as the motor terminals are shorted. This MC34931EK monolithic H-Bridge Power IC is designed to control any low voltage DC servo motors that are essentially within the voltage and current limits. Exceeding the ratings may cause a malfunction or permanent damage to the device.

The 34931 H-Bridge is able to control inductive loads with currents up to 5.0A peak. RMS current capability is subject to the degree of heat sinking provided to the device package. Internal peak current limiting (regulation) is activated at load currents above 6.5A ±1.5A. Output loads can be pulse-width modulated at frequencies up to 20 kHz. A load current feedback feature provides a proportional (0.24% of the load current) current output suitable for monitoring by a microcontroller's A/D input. A status flag output reports undervoltage, overcurrent, and overtemperature fault conditions. Two independent inputs provide polarity control of two half-bridge totem-pole outputs. The disable inputs are provided to force the H-Bridge outputs to tri-state (high-impedance off-state).

This H-bridge power IC is generally used for DC motor control. It has various applications that can be observed in copiers, printers, factory automation, ATM, vending kiosks, robotics, security camera control, and toll systems.