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
O(AVE)
= 400mA
Lead Free Package: SOT89-5L (Note 1)
SOT89-5L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 2)
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 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.
Typical Application Circuit
Vdd (24V)
D2
D1 R
pu
FG
5
4
288
1
2
3
Coil2
Coil1
D3
C1
48V
GND
* Rpu : typical 10 Kohm
48V
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
Z
=27V. Which C1and D3
value need to be fine tuned to optimize design for different coils and power suppliers .
24V DC Brush-less Fan with FG output function
AH288 Rev. 12
DS31040
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APRIL 2010
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Diodes Incorporated
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Ordering Information
AH288 - Y L - 13
Package
Y : SOT89-5L
Lead Free
L : Lead Free (Note 1)
G : Green
Packaging
(Note 3)
SOT89-5L
SOT89-5L
Packing
13 : Tape & Reel
Device
AH288-YL-13
AH288-YG-13
Notes:
Package
Code
Y
Y
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
1. AH288-YL-13 will be replaced by AH288-YG-13
2. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions 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.
Pin Assignments
( Top View )
Vdd 1
GND 2
DO 3
SOT89-5L
288
7
4 DOB
5 FG
Pin Descriptions
Pin Name
Vdd
GND
DO
DOB
FG
Pin No.
1
2
3
4
5
Description
Input power
Ground
Output pin
Output pin
Frequency generation
AH288 Rev. 12
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APRIL 2010
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Diodes Incorporated
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Block Diagram
Vdd
2
Lock shutdown
and
Automatic recovery
Regulator
DO
Hall
Plate
Amp.
Control Logic
DOB
GND
1
FG
AH288 Rev. 12
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Diodes Incorporated
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Absolute Maximum Ratings
Symbol
Vdd
I
O
P
D
T
ST
T
J
θ
JA
Supply Voltage
Output Current
(T
A
= 25°C)
Parameter
I
O(AVE)
I
O(PEAK)
Rating
30
400
700
800
-55 ~ 150
150
156
Unit
V
mA
mA
mW
°C
°C
°C/W
Power Dissipation
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction-to-Case (Note 5)
T
A
T
J
Tc
θ
JA
θ
JC
Notes:
5.
θ
JA
should be confirmed with what heat sink thermal resistance. If no heat sink contacting,
θ
JA
is almost the same as
θ
JC.
.
Recommended Operating Conditions
Symbol
Vdd
T
A
Notes:
Characteristic
Supply Voltage (Note 6)
Operating Ambient Temperature
Conditions
Operating
Operating
Min
3.8
-40
Max
28
100
Unit
V
°C
6. Please watch out the current limit issue when the operation voltage is over 26.4V, because of the different efficiency in the coil.
AH288 Rev. 12
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Diodes Incorporated
AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Electrical Characteristics
Symbol
I
CC
I
OFF
T
LRP-ON
T
LRP-OFF
V
OUT(SAT)
R
DS(ON)
V
OL
V
Z
Truth Table
IN-
H
L
-
(T
A
= 25
°C,
Vdd = 24V, unless otherwise specified)
Parameter
Supply Current
Output Leakage Current
Locked Protection On
Locked Protection Off
Output Saturation Voltage
Output On Resistance
FG Output Vds
Output Zener-breakdown Voltage
Conditions
Operating
V
OUT
= 24V
Min
-
-
0.4
2.4
-
-
-
-
42
Typ.
2
< 0.1
0.46
2.76
450
680
2.25
0.3
55
Max
4
10
0.6
3.6
700
800
3.5
0.5
65
Unit
mA
μA
Sec
Sec
mV
ohm
V
V
I
O
= 200mA
I
O
= 300mA
I
O
= 200mA
I
O
= 10mA
IN+
L
H
-
CT
L
L
H
OUT1
H
L
off
OUT2
L
H
off
FG
H
L
-
Mode
Rotating
Rotating
Lockup protection activated
Magnetic Characteristics
(T
A
= 25
°C,
Vdd = 24V, unless otherwise specified, Note 7)
(1mT=10 Gauss)
Symbol
Bop
Brp
Bhy
Notes:
Characteristics
Operate Point
Release Point
Hysteresis
Min
10
-60
-
Typ.
30
-30
60
Max
60
-10
-
Unit
Gauss
Gauss
Gauss
7. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.
AH288 Rev. 12
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APRIL 2010
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Diodes Incorporated
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