Diodes AH288 User Manual download pdf

AH288

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH288 Rev. 12 1 of 9 APRIL 2010

DS31040 www.diodes.com © Diodes Incorporated

• On chip Hall sensor

• Rotor-locked shutdown

• Automatically restart

• Frequency generator (FG) output

• Built-in Zener protection for output driver

• Operating voltage: 3.8V~28V

• Output current: I

O(AVE)

= 400mA

• Lead Free Package: SOT89-5L (Note 1)

• SOT89-5L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 2)

AH288 is a monolithic fan motor controller with Hall sensor’s

capability. It contains two complementary open-drain transistors

as motor coil drivers, automatic lock current shutdown, and

recovery protections. Additional, frequency generator (FG) output

is for speed detection 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

288

Vdd

(24V)

Coil2

Coil1

* Rpu : typical 10 Kohm

5 4

48V

GND

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 DC Brush-less Fan with FG output function

Features

General Description

1 2 3 4 5 6 7 8 9

Summary of Contents

Page 1 -

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 1 of 9

Page 2 - Pin Descriptions

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 2 of 9

Page 3 - Block Diagram

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 3 of 9

Page 4 - CONTROLLER

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 4 of 9

Page 5

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 5 of 9

Page 6 - Operating Characteristics

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 6 of 9

Page 7 - Power Dissipation Curve

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 7 of 9

Page 8

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 8 of 9

Page 9 - Diodes Incorporated

AH288HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER AH288 Rev. 12 9 of 9

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