AH287
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Features
•
•
•
•
•
•
•
•
•
On Chip Hall Sensor
Rotor-Locked Shutdown
Automatically Restart
Built-in Zener Protection for Output Driver
Operating Voltage: 3.8V~28V
Output Current: I
O(AVE)
= 400mA
Lead Free Packages: SIP-4L and SOT89-5L (Note 1)
SIP-4L and SOT89-5L: Available in “Green” Molding
Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 2)
General Description
AH287 is a monolithic fan motor controller with Hall sensor’s
capability. It contains two complementary open-drain 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.
Typical Application Circuit
24V
D2
287
D1
L2
L1
1
2
3
4
GND
DOB
D3
C1
DO
48V
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 Brush-Less DC Fan
AH287 Rev. 10
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Diodes Incorporated
AH287
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Ordering Information
AH 287 - X X - X
Package
P : SIP-4L
Y : SOT89-5L
Package
Code
P
P
Y
Y
Packaging
(Note 3)
SIP-4L
SIP-4L
SOT89-5L
SOT89-5L
Lead Free
L : Lead Free (Note 1)
G : Green
Bulk
Part Number
Quantity
Suffix
1000
-B
1000
-B
NA
NA
NA
NA
Packing
B : Bulk
13 : Tape & Reel
13” Tape and Reel
Part Number
Quantity
Suffix
NA
NA
NA
NA
2500/Tape & Reel
-13
2500/Tape & Reel
-13
Device
AH287-PL-B
AH287-PG-B
AH287-YL-13
AH287-YG-13
Notes:
1. AH287-YL-13 will be replaced by AH287-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 Assignment
( Top View )
287
1 : Vdd
2 : DO
3 : DOB
4 : GND
1 2
3
4
( Top View )
Vdd 1
GND 2
DO 3
SOT89-5L
287
5 NC
7 DOB
4
SIP-4L
AH287 Rev. 10
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Diodes Incorporated
AH287
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Pin Descriptions
Pin Name
Vdd
DO
DOB
GND
NC
Description
Input Power
Output Pin
Output Pin
Ground
Not Connected
Block Diagram
Vdd
Lock Shutdown
and
Automatic Recovery
Regulator
DO
Hall
Plate
Amp.
Control Logic
DOB
GND
AH287 Rev. 10
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Diodes Incorporated
AH287
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Absolute Maximum Ratings
Symbol
Vdd
I
O
(T
A
= 25°C)
Characteristics
Supply Voltage
Output Current
I
O(AVE)
I
O(PEAK)
SIP-4L
SOT89-5L
SIP-4L
SOT89-5L
Rating
30
400
400
700
550
800
-55 ~ 150
150
227
156
Unit
V
mA
mA
mA
mW
mW
°C
°C
°C/W
°C/W
P
D
T
ST
T
J
θ
JA
Power Dissipation
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction-to-Case
(Note 5)
SIP-4L
SOT89-5L
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.
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Diodes Incorporated
AH287
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Electrical Characteristics
Symbol
Idd
I
OFF
T
LRP-ON
T
LRP-OFF
V
OUT(SAT)
R
DS(ON)
Vz
Truth Table
IN-
H
L
-
(T
A
= 25
°C,
Vdd =24V, unless otherwise specified)
Characteristics
Supply Current
Output Leakage Current
Locked Protection On
Locked Protection Off
Output Saturation Voltage
Output On Resistance
Output Zener-Breakdown Voltage
Conditions
Operating
V
OUT
=24V
Min
-
-
0.4
2.4
-
-
-
42
Typ.
2.0
< 0.1
0.46
2.76
450
680
2.25
55
Max
4.0
10
0.6
3.6
700
800
3.5
65
Unit
mA
μA
Sec
Sec
mV
mV
ohm
V
I
O
=200mA
I
O
=300mA
I
O
=200mA
IN+
L
H
-
CT
L
L
H
OUT1
H
L
off
OUT2
L
H
off
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.
AH287 Rev. 10
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Diodes Incorporated
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