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AH292

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH292

Document number: DS31049 Rev. 7 - 2

1 of 8

www.diodes.com

June 2010

Description

AH292 is a monolithic fan motor controller with Hall sensor’s

capability. It contains two complementary open-collector

transistors for motor’s coil driving, automatic lock current

shutdown, and recovery protections. In addition a Frequency

generator (FG) output is also available for speed detection.

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 AH292 is available in SOT89-5L package.

Features

• On Chip Hall Sensor

• Rotor-Locked Shutdown

• Automatically Restart

• Frequency Generator (FG) Output

• Built-in Zener Protection for Output Driver

• Operating Voltage: 1.8V to 5.75V

• Output Current: I

O(AVE)

= 400mA

• Packaged in SOT89-5L

• Green Molding Compound

Pin Assignments

3 7

DOBDO

GND

Vdd

SOT89-5L

292

(Top View)

Applications

• Two-coil BLDC cooling fans

• Low to medium voltage, low power BLDC motors

Typical Application Circuit (Note 1)

292

Vdd

(1.8V/5.75V)

Coil 2 Coil 1

GND

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 DC Brush-less Fan with FG output function

1 2 3 4 5 6 7 8

Résumé du contenu

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Page 4 - ( SOT89-5L )

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Page 5 - Power Dissipation Curve

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Page 6 - SOT89-5L

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Page 8 - CONTROLLER

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