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AH478

SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION

BCD Semiconductor 

Data Sheet

SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478

General Description

Features

The AH478 is a single coil Hall sensor with output

drivers designed for brush-less DC motor application.

This IC consists of one H-bridge driver for motor's coil

driving and has automatic lock shutdown and restart

function relatively. To avoid coil burning, rotor lock

shutdown detection circuit shut down the output driver

if the rotor is 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.

If a 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-95 package.

· On-chip Hall Sensor

· Rotor-locked Shutdown

· Automatically Restart

· Operating Voltage: 3.5 to 18V

· High Output Sourcing/Sinking Capability up to

300mA

· Bi-direction H-type Output Drivers for Single

Coil

· Internal Bandgap Regulator for Temperature

Compensation

· Low Output Switching Current Noise

· Operating Temperature: -20 to 85oC

· Low Profile TO-95 Package

· ESD Rating: 3000V (Human Body Model)

Applications

· Single Coil Brushless DC Motor

· Single Coil Brushless DC Fan

Nov. 2008 Rev. 1. 2

TO-95

Figure 1. Package Type of AH478

BCD Semiconductor Manufacturing Limited

1

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