General Description

The AH278 is an integrated Hall sensor with output driver designed for electronic commutation of brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection and two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits and allows a wide operating supply voltage ranges.

Features

• On-Chip Hall Sensor

• 4V to 30V Supply Voltage

• 500mA (avg) Output Sink Current

• Build in Protection Diode for Reverse Power

Connecting

• -20°C to 85°C Operating Temperature

• Low Profile TO-94 (SIP-4L) Package

• Build in Over Temperature Protection Function

• ESD Rating: 300V(Machine Model)

Applications

• 12V/24V Dual-Coil Brushless DC Motor/Fan

• Power Supply and Switchboard

• Communications Facilities

• Industrial Equipment