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AH291-PL-B

Description
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
File Size146KB,9 Pages
ManufacturerDiodes
Websitehttp://www.diodes.com/
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AH291-PL-B Overview

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER

AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
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.
Pin Assignments
(Top View)
291
1 : Vdd
2 : DO
3 : DOB
4 : GND
1 2
3
4
(Top View)
Vdd
1
2
291
5
NC
GND
DO
3
7
DOB
4
SOT89-5L
SIP-4L
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
Applications
Two-coil BLDC cooling fans
Low to medium voltage, low power BLDC motors
Typical Application Circuit
(Note 1)
1.8V/5.75V
V
dd
D2
D1
291
L2
L1
1
2
3
4
GND
C3
DO
Notes:
DOB
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.
R1
C1
R2
C2
1.8V/5.75V Brush-Less DC Fan
AH291
Document number: DS31041 Rev. 8 - 2
1 of 9
www.diodes.com
June 2010
© Diodes Incorporated

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