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AH277AZ4-AE1

COMPLEMENTARY OUTPUT HALL EFFECT LATCH

BCD Semiconductor 

Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH

General Description

Features

AH277A

The AH277A is an integrated Hall sensor with output

driver designed for electronic commutation of brush-

less 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, a tem-

perature compensation circuit to compensate the tem-

perature drift of Hall sensitivity 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.

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).

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 400mA (avg) Output Sink Current

· Reversed Supply Voltage Protection

· -20oC to 85oC Operating Temperature

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 300V (Machine Model)

Applications

· Dual-Coil Brushless DC Motor

· Dual-Coil Brushless DC Fan

· Revolution Counting

· Speed Measurement

AH277A is available in TO-94 (SIP-4L) package.

Oct. 2009 Rev. 1. 6

TO-94

Figure 1. Package Type of AH277A

BCD Semiconductor Manufacturing Limited

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