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AH287

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH287 Rev. 10 1 of 11 APRIL 2010

DS31042 www.diodes.com © Diodes Incorporated

• On Chip Hall Sensor

• Rotor-Locked Shutdown

• Automatically Restart

• Built-in Zener Protection for Output Driver

• Operating Voltage: 3.8V~28V

• Output Current: I

O(AVE)

= 400mA

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

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

Compound (No Br, Sb)

• 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

24V

L2 L1

GND

287

12 34

48V

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

D3 is recommended to be Zener Diode, V

=27V. Which C1and D3 value need to be fine tuned to optimize

design for different coils and power suppliers.

24V Brush-Less DC Fan

Features

General Description

1 2 3 4 5 6 ... 10 11

Inhaltsverzeichnis

Seite 1 - General Description

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 1 of 11

Seite 2 - Pin Assignment

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 10 of 11

Seite 3 - Pin Descriptions

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 11 of 11

Seite 4 - = 25°C)

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 2 of 11

Seite 5

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 3 of 11

Seite 6 - Operating Characteristics

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 4 of 11

Seite 7 - Performance Characteristics

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 5 of 11

Seite 8 - Marking Information

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 6 of 11

Seite 9 - Sensor Location

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 7 of 11

Seite 10 - CONTROLLER

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 8 of 11

Seite 11

AH287HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH287 Rev. 10 9 of 11

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Diodes AH287 Bedienungsanleitung

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