AH277AZ4-CG1

AH277AZ4-CG1 is an integrated hall sensor with an 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, a temperature compensation circuit to compensate for the temperature drift of Hall sensitivity and two complementary open-collector drivers for sinking large load current. Placing the device in a variable magnetic field, if the magnetic flux density is larger than the 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). Applications include dual-coil brushless DC motor, dual-coil brushless DC fan, revolution counting, and speed measurement.

• Includes internal band-gap regulator, which is used to provide a bias voltage for internal circuits
• 3.5V to 16V supply voltage
• 400mA (avg) output sink current
• Reversed supply voltage protection
• ESD rating: 300V (machine model)
• Output leakage current is 0.1µA typ at VCE=16V, TA=25°C, VCC=14V
• Supply current is 12mA typ at VCC=16V, output open, TA=25°C, VCC=14V
• Output Zener breakdown voltage is 55V typ at TA=25°C, VCC=14V
• TO-94 package
• Operating temperature range from -20 to 85°C