General Description

The AH478 is a single coil Hall sensor with output drivers designed for brush-less DC motor application. This IC consists of one H-bridge driver for motors coil driving and has automatic lock shutdown and restart function relatively. To avoid coil burning, rotor lock shutdown detection circuit shut down the output driver if the rotor is blocked and then the automatic recovery circuit will try to restart the motor. This function repeats while rotor is blocked. Until the blocking is removed, the motor recovers running normally.

Features

• On-chip Hall Sensor

• Rotor-locked Shutdown

• Automatically Restart

• Operating Voltage: 3.5 to 18V

• High Output Sourcing/Sinking Capability up to

300mA

• Bi-direction H-type Output Drivers for Single

Coil

• Internal Bandgap Regulator for Temperature

Compensation

• Low Output Switching Current Noise

• Operating Temperature: -20 to 85oC

• Low Profile TO-95 Package

• ESD Rating: 3000V (Human Body Model)

Applications

• Single Coil Brushless DC Motor

• Single Coil Brushless DC Fan