AH287Z4-AE1(2008) データシートの表示（PDF） - BCD Semiconductor

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AH287Z4-AE1
(Rev.:2008)

TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION

BCD Semiconductor 

Data Sheet

TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287

General Description

The AH287 is an integrated Hall sensor with output

drivers for brushless DC motor application. This IC

consists of two complementary outputs for motor’s

coil driving and has automatic lock protection and

auto- restart function relatively. To avoid coil burning,

rotor lock shutdown protection circuit shut down the

output driver if the rotor blocked and then the

automatic recovery circuit will try to restart the motor.

This function repeats while rotor is blocked. Until the

blocking is removed, the motor recovers running

normally. In addition, the auto-restart time is flexible

by adjusting the capacitance (CCT).

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 a magnetic flux density

reversal falls below BRP, causing DO to be turned to

drive and DOB turned to sink.

This IC is available in TO-94 package.

Features

• On-chip Hall Sensor

• Operating Voltage: 4V to 18V

• Maximum Output Current: 350mA (ave)

• Rotor-locked Protection

• Automatic Restart

• Adjustable Auto-restart Time

• Internal Band-gap Regulator for Temperature

Compensation

• Operating Temperature: -20˚C to 85˚C

• Low Profile TO-94 Package

• ESD Rating: 300V (Machine Model)

Application

• Dual-coil Brushless DC Fan

Aug. 2008 Rev. 1. 1

TO-94

Figure 1. Package Type of AH287

BCD Semiconductor Manufacturing Limited

1

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