General Description

The AH287 is an integrated Hall sensor with output drivers for brushless DC motor application. This IC consists of two complementary outputs for motor’s coil driving and has automatic lock protection and auto- restart function relatively. To avoid coil burning, rotor lock shutdown protection circuit shut down the output driver if the rotor 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. In addition, the auto-restart time is flexible by adjusting the capacitance (CCT).

Features

• On-chip Hall Sensor

• Operating Voltage: 3.5V to 18V

• Maximum Output Current: 350mA (ave)

• Rotor-locked Protection

• Automatic Restart

• Adjustable Auto-restart Time

• Internal Band-gap Regulator for Temperature Compensation

• Operating Temperature: -20˚C to 85˚C

• Low Profile TO-94 Package

• ESD Rating: 300V (Machine Model)

Application

• Dual-coil Brushless DC Fan