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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
The AH286 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. To help protect the motor coils, the AH286 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. A Rotor-lock Detect (RD) output flag allows external monitoring of any motor locks. The AH286 is available in SOT89-5L package.
Pin Assignments
(Top View)
Vdd
1 2 286
5 RD
GND
DO 3
7 DOB 4 SOT89-5L
Features
* * * * * * * * * Single-chip solution Operating Voltage: 3.8V to 20V Built-in Hall sensor and input amplifier Rotor-lock Detect (RD) flag Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Built-in Zener protection for output driver Average output current up to 500mA Packaged in SOT89-5L Green Molding Compound
Applications
* * Two-coil BLDC cooling fans Low to medium voltage, low power BLDC motors
Typical Application Circuit
Vdd (12V) D2
D1 Rpu RD
5
4
286
1 2 3
Coil2 Coil1
D3
C3
GND
R1 C1
R2 C2
12V DC Brush-Less Fan with RD Output Function
Notes: 1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2F E-Cap capacitor for C1, C2 and C3. These values may need to be optimized depending on the coils used. To help with IC protection it's advised to add a Zener diode between Vdd and ground. The Zener diode should be chosen to help prevent the supply voltage exceeding the maximum rating of the device. 1 of 9 www.diodes.com June 2010
(c) Diodes Incorporated
AH286
Document number: DS31030 Rev. 12 - 2
AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Pin Descriptions
Pin Name RD Vdd DO DOB GND Description Rotor-state detection Input power Output pin Output pin Ground
Functional Block Diagram
Vdd
Lock detect, shutdown and automatic re-start Regulator
DO
Hall Plate
Amp.
Control Logic
DOB
GND
RD
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25C)
Symbol Vdd IO PD TST TJ JA Supply Voltage Output Current Power Dissipation Storage Temperature Maximum Junction Temperature Thermal Resistance Junction to Case (Note 2)
TA TJ Tc
Characteristics IO (AVE) IO (PEAK)
Rating 24 500 700 800 -55 ~ 150 150 156
Unit V mA mA mW C C C/W
JA JC
Notes:
2. JA should be confirmed with heat sink thermal resistance. If there is no heat sink contact, JA will almost be the same as JC..
Recommended Operating Conditions
Symbol Vdd TA Characteristic Supply Voltage Operating Ambient Temperature Conditions Operating Operating Min 3.8 -40 Max 20 100 Unit V C
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25 C, Vdd = 12V, unless otherwise specified)
Symbol Idd IOFF TRLP-ON TRLP-OFF VOUT(SAT) RDS(ON) VOL Vz Characteristics Supply Current Output Leakage Current Rotor Lock Protection On Time Rotor Lock Protection Off Time Output Saturation Voltage Output On Resistance RD Output Vds Output Zener-Breakdown Voltage IO = 300mA IO = 500mA IO = 300mA IO = 10mA Conditions Operating VOUT = 24V Min 0.4 2.4 35 Typ. 2.0 < 0.1 0.5 3 375 625 1.25 0.5 42 Max 4.0 10 0.6 3.6 500 900 1.67 60 Unit mA A Sec Sec mV ohm V V
Truth Table (Note 3) ININ+ H L L H Notes:
CT L L H
OUT1 H L off
OUT2 L H off
RD L L H
Mode Rotating Rotating Lockup protection activated
3. Latch-type RD output is low during rotor rotation and high when the rotor is locked (not rotating)
Magnetic Characteristics (TA = 25 C, Vdd = 12V, unless otherwise specified, Note 4)
(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
4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Operating Characteristics
DOB DO
Output Voltage in Volts
RP
12 10 8 6 4
Output Voltage in Volts
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
N
( SOT89-5L )
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
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 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)
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information
AH 286 - Y G - 13
Package Y : SOT89-5L
Green G : Green (Note 5)
Packing 13 : Tape & Reel
Device AH286-YG-13
Notes:
Package Code Y
Packaging (Note 6, 7) SOT89-5L
Bulk Part Number Quantity Suffix NA NA
13" Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13
5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 6. 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. 7. 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
(Top View)
5
4
7 286 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
SOT89-5L
3
AH286
Document number: DS31030 Rev. 12 - 2
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm)
Sensor Location
AH286
Document number: DS31030 Rev. 12 - 2
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(c) Diodes Incorporated
AH286
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.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2010, Diodes Incorporated www.diodes.com
AH286
Document number: DS31030 Rev. 12 - 2
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