Diodes AH291 Manuel d'utilisateur télécharger pdf

AH291

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH291

Document number: DS31041 Rev. 8 - 2

1 of 9

www.diodes.com

June 2010

Description

AH291 is a monolithic fan motor controller with Hall sensor’s

capability. It contains two complementary open-collector

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.

The AH291 is available in SIP4 and SOT89-5L packages.

Features

• On Chip Hall Sensor

• Rotor-Locked Shutdown

• Automatically Restart

• Built-in Zener Protection for Output Driver

• Operating Voltage: 1.8V to 5.75V

• Output Current: I

O(AVE)

= 400mA

• Packages: SIP-4L and SOT89-5L

• Green Molding Compound

Pin Assignments

291

12 43

1 : Vdd

2 : DO

3 : DOB

4 : GND

SIP-4L

(Top View)

3 7

DOBDO

GND

Vdd

SOT89-5L

291

(Top View)

Applications

• Two-coil BLDC cooling fans

• Low to medium voltage, low power BLDC motors

Typical Application Circuit (Note 1)

DOB

GND

1.8V/5.75V

L2 L1

291

R1 R2

C1 C2

Notes: 1. R1, R2: typical 56 Ohm

C1, C2, C3: typical 2.2µF

The R, C value need to be fine tuned based on coils design.

1.8V/5.75V Brush-Less DC Fan

1 2 3 4 5 6 7 8 9

Résumé du contenu

Page 1 - (Top View)

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AH291LOW VOLTAGE HALL-EFFECT SMART FAN MOTORCONTROLLER AH291 Document number: DS31041 Rev. 8 - 2 2 of 9 www.diodes.com June 2010 © Diodes Incorpora

Page 3 - )SAT(OUT

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Page 4 - ( SOT89-5L )

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Page 5 - Power Dissipation Curve

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Page 7 - Sensor Location

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Page 8

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Page 9 - CONTROLLER

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