Diodes AH288 User Manual
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Features
• On chip Hall sensor
• Rotor-locked shutdown
• Automatically restart
• Frequency generator (FG) output
• Built-in Zener protection for output driver
• Operating voltage: 3.8V~28V
• Output current: I
• Lead Free Package: SOT89-5L (Note 1)
• SOT89-5L: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 2)
O(AVE)
= 400mA
Typical Application Circuit
Vdd
(24V)
R
D1
pu
FG
General Description
AH288 is a monolithic fan motor controller with Hall sensor’s
capability. It contains two complementary open-drain transistors
as motor coil drivers, automatic lock current shutdown, and
recovery protections. Additional, frequency generator (FG) output
is for speed detection relatively.
Rotor-lock shutdow n detection circuit turns off the out put 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. U ntil
the blocking is removed, the motor recovers and runs normally.
D2
5 4
288
Coil2
Coil1
48V
D3
132
C1
GND
* Rpu : typical 10 Kohm
Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is recommended to
be E-Cap., luF/25V; D3 is recommended to be Zener Diode, V
value need to be fine tuned to optimize design for different coils and power suppliers .
=27V. Which C1and D3
Z
48V
24V DC Brush-less Fan with FG output function
AH288 Rev. 12 1 of 9 APRIL 2010
DS31040 www.diodes.com © Diodes Incorporated
Ordering Information
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
AH288 - Y L - 13
PackingPackage Lead Free
AH288
Y : SOT89-5L
L : Lead Free (Note 1)
13 : Tape & Reel
G : Green
Device
AH288-YL-13 Y SOT89-5L 2500/Tape & Reel -13
AH288-YG-13 Y SOT89-5L 2500/Tape & Reel -13
Notes: 1. AH288-YL-13 will be replaced by AH288-YG-13
2. EU Directive 2002/95/EC (RoHS). All applicable RoHS e xemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
3. 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.
4. Reverse taping as shown on Diodes Inc. Surface Mount (SMD) Packaging document AP02007, which can be found on our website
http://www.diodes.com/datasheets/ap02007.pdf.
Package
Code
Packaging
(Note 3)
Quantity Part Number Suffix
13” Tape and Reel
Pin Assignments
( Top View )
Vdd
GND
1
288
2
FG
5
DO
3
SOT89-5L
7
4
DOB
Pin Descriptions
Pin Name Pin No. Description
Vdd 1 Input power
GND 2 Ground
DO 3 Output pin
DOB 4 Output pin
FG 5 Frequency generation
AH288 Rev. 12 2 of 9 APRIL 2010
DS31040 www.diodes.com © Diodes Incorporated
Block Diagram
Vdd
2
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Lock shutdown
and
Automatic recovery
AH288
Regulator
Hall
Plate
Amp.
GND
DO
Control Logic
DOB
1
FG
AH288 Rev. 12 3 of 9 APRIL 2010
DS31040 www.diodes.com © Diodes Incorporated
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