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 onchip 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