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