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Diodes Semiconductor Electronic Components Datasheet

AH291 Datasheet

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER

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AH291 pdf
Features
AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
General Description
On Chip Hall Sensor
Rotor-Locked Shutdown
Automatically Restart
Built-in Zener Protection for Output Driver
Operating Voltage: 1.8V~5.75 V
Output Current: IO(AVE) = 400 mA
Lead Free Packages: SIP-4L and SOT89-5L
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.
Ordering Information
AH291 - X X X
Package
Lead
P: SIP-4L L : Lead Free
Y: SOT89-5L
Packing
-B : Bulk
-7/-13 : Taping
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
Package Packaging
Code
(Note 2)
AH291-P
Lead-free
P
SIP-4L
AH291-Y Y SOT89-5L
Lead-free
Tube/Bulk
Quantity
Part Number
Suffix
1000
-B
NA NA
7” Tape and Reel
Quantity
Part Number
Suffix
NA NA
2500/Tape & Reel
-13
Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AH291 Rev. 3
1 of 10
www.diodes.com
JANUARY 2007
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH291 Datasheet

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER

No Preview Available !

AH291 pdf
Pin Assignment
AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Front View
291
1 : Vdd
2 : DO
3 : DOB
12 3 4
4 : GND
SIP-4L
Vdd 1
5 NC
GND 2 AH291
DO 3
74 DOB
SOT89-5L
Pin Descriptions
Name
Vdd
DO
DOB
GND
NC
Description
Input Power
Output Pin
Output Pin
Ground
Not Connected
AH291 Rev. 3
2 of 10
www.diodes.com
JANUARY 2007
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH291 Datasheet

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER

No Preview Available !

AH291 pdf
Block Diagram ( SIP-4L )
AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Vdd
1
Regulator
Hall
Plate
Amp.
Lock Shutdown
and
Automatic Recovery
Control Logic
2 DO
3 DOB
Typical Application Circuit
4
GND
1.8V/5.75V
Vdd
D1
D2
291
1234
GND
C3 DOB
DO
Notes: R1, R2: typical 56 O
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
AH291 Rev. 3
3 of 10
www.diodes.com
L2 L1
R1 R2
C1 C2
JANUARY 2007
© Diodes Incorporated




Part Number AH291
Description LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Maker Diodes Incorporated
Total Page 10 Pages
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