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| Product Brief HIGH VOLTAGE HALL EFFECT LATCH 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. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB will be turned high (off). This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on). AH278 Parametric Table Supply Current (mA) Output Saturation Voltage (24V, 300mA) (V) Hysteresis (Gauss) Output Leakage Current (A) Package 12.5 0.25 80 0.1 TO-94 Features * * * * * * * * On-Chip Hall Sensor 4V to 30V Supply Voltage 500mA (avg) Output Sink Current Build in Protection Diode for Reverse Power Connecting -20oC to 85oC Operating Temperature Low Profile TO-94 (SIP-4L) Package Build in Over Temperature Protection Function ESD Rating: 300V(Machine Model) Benefits * * * * * Good High Temperature Performance With Over Temperature Protection (OTP) function Very Low Saturation Voltage Complementary Output Optimization Solution: Higher Current at High Voltage(24V) and Temperature (85oC) Applications * * * * 12V/24V Dual-Coil Brushless DC Motor/Fan Power Supply and Switchboard Communications Facilities Industrial Equipment Additional Available Materials * * * * Samples Data Sheet Reliability Report ESD Report Feb. 2007 BCD Semiconductor Manufacturing Limited Product Brief TWO PHASE HALL EFFECT LATCH WITH FG OUTPUT Pin Configuration AH278 Z4 Package (TO-94) 4 3 2 1 GND DOB DO VCC Ordering Information Example Package TO-94 Temperature Range -20 to 85 oC Part Number AH278Z4-AE1 AH278Z4-BE1 Marking ID AH278Z4-E1 AH278Z4-E1 Packing Type Bulk Bulk Detailed information please refer to the relevant datasheet. Sales Office: USA 30920 Huntwood Ave. Hayward, CA 94544, USA Tel : +1-510-324-2988 Fax : +1-510-324-2788 Taiwan 4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel : 886-2-2656-2808 Fax : 886-2-2656-2806 Shanghai 8F, B Zone, 900 Yi Shan Road, Shanghai 200233, China Tel : 86-21-6495 9539 Fax : 86-21-6485 9673 Shenzhen Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Tel : 86-755-8826 7951 Fax : 86-755-8826 7865 Feb. 2007 BCD Semiconductor Manufacturing Limited |
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