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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description
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. The AH291 is available in SIP4 and SOT89-5L packages.
Pin Assignments
(Top View) 291
1 : Vdd 2 : DO 3 : DOB 4 : GND 12 3 4
(Top View)
Vdd
1 2 291
5 NC
GND
DO 3
7 DOB 4 SOT89-5L
SIP-4L
Features
* * * * * * * * On Chip Hall Sensor Rotor-Locked Shutdown Automatically Restart Built-in Zener Protection for Output Driver Operating Voltage: 1.8V to 5.75V Output Current: IO(AVE)= 400mA Packages: SIP-4L and SOT89-5L Green Molding Compound
Applications
* * Two-coil BLDC cooling fans Low to medium voltage, low power BLDC motors
Typical Application Circuit (Note 1)
1.8V/5.75V Vdd D2
D1
291
L2
L1
1
2
3
4 GND
C3 DO
Notes:
DOB
1. R1, R2: typical 56 Ohm C1, C2, C3: typical 2.2F The R, C value need to be fine tuned based on coils design.
R1 C1
R2 C2
1.8V/5.75V Brush-Less DC Fan AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW 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
Functional Block Diagram
Vdd
Lock detect, shutdown and automatic re-start Regulator
DO
Hall Plate
Amp.
Control Logic
DOB
GND
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25C)
Symbol Vdd IO PD TST TJ Characteristics Operating Supply Voltage Output Current IO(AVE) IO(PEAK) SIP-4L SOT89-5L SIP-4L SOT89-5L Rating 8 400 400 700 550 800 -55 ~ 150 150 Unit V mA mA mA mW mW C C
Power Dissipation Storage Temperature Maximum Junction Temperature
Recommended Operating Conditions
Symbol Vdd TA
Notes:
Characteristic Supply Voltage (Note 2) Operating Ambient Temperature
Conditions Operating Operating
Min 1.8 -20
Max 5.75 100
Unit V C
2. The output of IC will be switched after the supply voltage is over 1.8V, but the magnetic characteristics won't be normal until the supply is over 2.0V.
Electrical Characteristics (TA = 25 C, Vdd = 5V, unless otherwise specified)
Symbol Idd TRLP-ON TRLP-OFF Characteristics Supply Current Rotor Lock Protection On Time Rotor Lock Protection Off Time Output Saturation Voltage Output On Resistance Output Zener-Breakdown Voltage Conditions Operating Min 2.4 Typ. 2.6 0.4 3 300 600 1.75 15 Max 4.0 3.6 Unit mA Sec Sec mV mV ohm V
VOUT ( SAT )
RDS(ON) Vz Truth Table INH L -
IO = 180mA IO = 350mA
IN+ L H -
CT L L H
OUT1 H L off
OUT2 L H off
Mode Rotating Rotating Lockup protection activated
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Magnetic Characteristics (TA = 25 C, Vcc = 24V, unless otherwise specified, Note 3)
(1mT = 10 Gauss) Max Unit 60 Gauss Gauss Gauss
Symbol Bop Brp Bhy
Notes:
Characteristics Operation Point Release Point Hysteresis
Min -60 -
Typ. 30 -30 60
3. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
DOB DO
Output Voltage in Volts
Output Voltage in Volts
RP
12 10 8 6 4
OFF
OFF
12 10 8 6 4
OP
ON
2
OP VSAT
RP
2
ON
VSAT Brp 0 Bop
Brp
0
Bop
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
Marking side
S
Marking side
N
( SIP-4L )
N
( SOT89-5L )
AH291
Document number: DS31041 Rev. 8 - 2
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(c) Diodes Incorporated
AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Performance Characteristics
(1) SIP-4L TA (C) PD (mW) TA (C) PD (mW)
P D (mW )
6 00 5 00 4 00 3 00 2 00 1 00 0 0 25 50 75 10 0 125 15 0 T A (C )
25 550 105 198
50 440 110 176
60 396 115 154
70 352 120 132
80 308 125 110
85 286 130 88
90 264 135 66
95 242 140 44
100 220 150 0
Pow er D iss ipation Curv e
(2) SOT89-5L TA (C) PD (mW) TA (C) PD (mW)
25 800 105 288
50 640 110 256
60 576 115 224
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)
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information
AH 291 - X G - X
Package P : SIP-4L Y : SOT89-5L
Device Package Code Y Packaging (Note 5, 6) SOT89-5L
Green G : Green (Note 4)
Packing B : Bulk 13 : Tape & Reel
13" Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13
AH291-YG-13
Notes:
Bulk Part Number Quantity Suffix NA NA
4. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 5. 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. 6. 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.
Marking Information
(1) SIP-4L
( Top View )
Part Number
291 Y WW X
Y : Year : 0~9 WW : Week : 01~52, "52" represents 52 and 53 week X : Internal Code : A~Z : Green
(2) SOT89-5L
( Top View )
5
4
7 291 Y W X
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 : Green
1
2
3
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm)
(1) Package type: SIP-4L
Marking side
1.10.1mm
1.950.1mm
0.7 mm
1
2
3
4
Active Area Depth
Package Dimension
Sensor Location
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (Continued)
(2) Package type: SOT89-5L
Sensor Location
AH291
Document number: DS31041 Rev. 8 - 2
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AH291
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.
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AH291
Document number: DS31041 Rev. 8 - 2
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June 2010
(c) Diodes Incorporated

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