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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: IO(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 Rpu 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, VZ =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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(c) 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 DS31040
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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
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Absolute Maximum Ratings
Symbol Vdd IO PD TST TJ JA Supply Voltage Output Current
(TA = 25C)
Parameter IO(AVE) IO(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)
TA TJ Tc
JA JC
Notes:
5.
JA should be confirmed with what heat sink thermal resistance. If no heat sink contacting, JA is almost the same as JC..
Recommended Operating Conditions
Symbol Vdd TA
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 DS31040
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Electrical Characteristics
Symbol ICC IOFF TLRP-ON TLRP-OFF VOUT(SAT) RDS(ON) VOL VZ Truth Table INH L -
(TA = 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 VOUT = 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 A Sec Sec mV ohm V V
IO = 200mA IO = 300mA IO = 200mA IO = 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
(TA = 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 DS31040
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Operating Characteristics
DOB
Output Voltage in Volts
DO
RP
24 20 16 12 8
Output Voltage in Volts
OFF
OFF
24 20 16 12 8
OP
ON
4
OP Vsat
RP
4
ON
Vsat Brp 0 Bop
Brp
0
Bop
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
Marking side
N
( SOT89-5L )
AH288 Rev. 12 DS31040
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Performance Characteristics
TA (C) PD (mW) TA (C) PD (mW) 25 800 105 288 50 640 110 256 60 576 115 224
(SOT89-5L)
70 512 120 192
75 480 125 160
80 448 130 128
85 416 135 96
90 384 140 64
95 352 145 32
100 320 150 0
P D (mW )
900 800 700 600 500 400 300 200 100 0 -4 0 0 25
Power Dissipation Curve
50
75
10 0
125
1 50
T A (C)
Marking Information
(1) SOT89-5L
( Top View )
5
4
7 288 Y W X
1
2
3
Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code a~z : Lead Free A~Z : Green
AH288 Rev. 12 DS31040
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Package Information
(1) Package type: SOT89-5L
(All Dimensions in mm)
Sensor Location
AH288 Rev. 12 DS31040
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AH288
HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
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AH288 Rev. 12 DS31040
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