Diodes AH292 - Manual

AH292
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
AH292
Document number: DS31049 Rev. 7 - 2
1 of 8
www.diodes.com
June 2010
© Diodes Incorporated
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
1
2
3 74
5
DOB DO
GND
FG 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
1 5 4 3 2
Vdd
(1.8V/5.75V)
Coil 2 Coil 1
R pu
FG
GND
D2
D1
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.
C3
1.8V/5.75V DC Brush-less Fan with FG output function