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| Product Brief SINGLE PHASE HALL EFFECT LATCH Description The AH477 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 comparator to provide switching hysteresis for noise rejection, a bi-directional drivers for sinking and driving large current load. It also includes an internal bandgap regulator to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned to driveand DOB turned to sink. AH477 Parametric Table Supply Voltage (V) Output Down Saturation Voltage (V) Output Up Saturation Voltage (V) Supply Current (mA) Hysteresis (Gauss) Package 4 to 20 0.25 1.0 14 70 TO-94 Features * * * * * * * * On-Chip Hall Sensor Operating Voltage: 4V to 20V H-Bridge Output Drivers for Single Coil Internal Bandgap Regulator for Temperature Compensation Low Output Switching Current Noise -20oC to 85oC Operating Temperature Low Profile TO-94 (SIP-4L) Package ESD Rating: 3000V (Human Body Model) Benefits * * * * Minimum External Components Good High Temperature Performance High Efficiency Rotate Reposefully Applications * * Single-Coil Brushless DC Motor Single-Coil Brushless DC Fan Additional Available Materials * * * * Samples Preliminary Datasheet Reliability Report ESD Report Nov. 2007 BCD Semiconductor Manufacturing Limited Product Brief SINGLE PHASE HALL EFFECT LATCH Pin Configuration Z4 Package (TO-94) AH477 4 3 2 1 GND DOB DO VCC Ordering Information Example Package TO-94 Temperature Range -20 to 85 oC Part Number AH477Z4-AE1 AH477Z4-BE1 Marking ID AH477Z4-AE1 AH477Z4-BE1 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 Nov. 2007 BCD Semiconductor Manufacturing Limited |
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