AH276Z4-BG1 Diodes Incorporated

Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276 General Description Features The AH276 is an integrated Hall sensor with output On-Chip Hall Sensor driver designed for electronic commutation of brush- 3.5V to 16V Supply Voltage less DC motor applications. The device includes an on- 350mA (avg) Output Sink Current chip Hall sensor for magnetic sensing, an amplifier Reversed Supply Voltage Protection that amplifies the Hall voltage, a Schmitt trigger to Build in Over Temperature Protection Function provide switching hysteresis for noise rejection, a tem- o o -20 C to 85 C Operating Temperature perature compensation circuit to compensate the tem- Low Profile TO-94 (SIP-4L) Package perature drift of Hall sensitivity and two complementary open-collector drivers for sinking ESD Rating: 300V (Machine Model) large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for Applications internal circuits. Dual-Coil Brushless DC Motor Placing the device in a variable magnetic field, if the Dual-Coil Brushless DC Fan magnetic flux density is larger than threshold B , the OP Revolution Counting pin DO will be turned low (on) and pin DOB will be Speed Measurement turned high (off). This output state is held until the magnetic flux density reverses and falls below B RP, then causes DO to be turned high (off) and DOB turned low (on). AH276 is available in TO-94 (SIP-4L) package. TO-94 Figure 1. Package Type of AH276 Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 1 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276 Pin Configuration Z4 Package (TO-94) 4 GND 3 DOB 2 DO 1 V CC Figure 2. Pin Configuration of AH276 (Front View) Pin Description Pin Number Pin Name Function V 1 Supply voltage CC 2 DO Output 1 3 DOB Output 2 4 GND Ground Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited 2