AH291-PG-13 Ver la hoja de datos (PDF) - Diodes Incorporated.
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AH291-PG-13 Datasheet PDF : 9 Pages
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Description
Pin Assignments
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.
(Top View)
(Top View)
291
Vdd 1
1 : Vdd
5 NC
2 : DO GND 2
291
12 3 4
SIP-4L
3 : DOB
4 : GND
DO 3
74 DOB
SOT89-5L
Features
Applications
• 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: IO(AVE)= 400mA
• Packages: SIP-4L and SOT89-5L
• Green Molding Compound
• Two-coil BLDC cooling fans
• Low to medium voltage, low power BLDC motors
Typical Application Circuit (Note 1)
1.8V/5.75V
Vdd
D2
D1
291
L2
1234
GND
C3
DOB
DO
Notes: 1. R1, R2: typical 56 Ohm
R1
C1, C2, C3: typical 2.2µF
The R, C value need to be fine tuned based on coils design.
C1
AH291
Document number: DS31041 Rev. 8 - 2
1.8V/5.75V Brush-Less DC Fan
1 of 9
www.diodes.com
L1
R2
C2
June 2010
© Diodes Incorporated
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