AH287

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH287 Rev. 10

1 of 11

APRIL 2010

DS31042

www.diodes.com

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On Chip Hall Sensor

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Rotor-Locked Shutdown

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Automatically Restart

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Built-in Zener Protection for Output Driver

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Operating Voltage: 3.8V~28V

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Lead Free Packages: SIP-4L and SOT89-5L (Note 1)

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SIP-4L and SOT89-5L: Available in “Green” Molding

Compound (No Br, Sb)

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Lead Free Finish/ RoHS Compliant (Note 2)

AH287 is a monolithic fan motor controller with Hall sensor’s

capability. It contains two complementary open-drain drivers for

motor’s coil driving, automatic lock shutdown and restart function

relatively.

Rotor-lock shutdown detection circuit turns off the output driver

when the rotor is blocked to avoid coil overheat. Then, the

automatic recovery circuit will restart the motor. These protected

actions are repeated and periodic during the blocked period. Until

the blocking is removed, the motor recovers and runs normally.

Typical Application Circuit

DOB

DO

24V

L2

L1

GND

287

12

3

4

D2

48V

48V

C1

D1

D3

Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is recommended to be E-Cap., luF/25V;

design for different coils and power suppliers.

24V Brush-Less DC Fan

Features

General Description