COMPLEMENTARY OUTPUT HALL EFFECT LATCH

AH276

1

Nov. 2009 Rev. 1. 4

BCD Semiconductor Manufacturing Limited

Data Sheet

General Description

The AH276 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

pin DO will be turned low (on) and pin DOB will be

turned high (off). This output state is held until the

then causes DO to be turned high (off) and DOB

turned low (on).

AH276 is available in TO-94 (SIP-4L) package.

Features

·

On-Chip Hall Sensor

·

3.5V to 16V Supply Voltage

·

350mA (avg) Output Sink Current

·

Reversed Supply Voltage Protection

·

Build in Over Temperature Protection Function

·

·

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

Figure 1. Package Type of AH276

TO-94