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AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Features
* * * * * On-chip Hall sensor with two different sensitivity and hysteresis settings for AH276 Built-in protecting diode only for chip reverse power connecting -20C to 85C operating temperature Lead Free Finish/RoHS Compliant for Lead Free products (Note 1) Lead Free Package: SIP-4L
General Description
AH276 are integrated Hall sensors with output drivers, mainly designed for electronic commutation of brush-less DC Fan. This IC internally includes the regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB). While the magnetic flux density (B) is larger than operate point (Bop), DO will turn on (low), and meanwhile DOB will turn off (high). Each output is latched until B is lower than release point (Brp), and then DODOB transfer each state. For DC fan application, sometimes need to test power reverse connection condition. Internal diode only protects chip-side but not for coil-side. If necessary, add one external diode to block the reverse current from coil-side.
Applications
* * * * Dual-coil Brush-less DC Motor Dual-coil Brush-less DC Fan Revolution Counting Speed Measurement
Ordering Information
AH276 X - X X X - X
Version Q
Package P: SIP-4L
Lead Free L : Lead Free
Packing -B : Bulk
Magnetic Characteristics A: A grade (Note 3) B: B grade (Note 3) C: C grade (Note 3)
Note:
1.
RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
Lead-free
Package Code
P
Packaging (Note 2)
SIP-4
Quantity
1000
Tube/Bulk Part Number Suffix
-B
AH276Q-P
Note:
2. 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. Please refer to page 4 (Magnetic Characteristics table).
AH276Q Rev. 1
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JANUARY 2007
(c) Diodes Incorporated
AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Typical Application Circuit
276
12V 1uF/25V
1
2
3
4
Brush-less DC Fan
Block Diagram
1
V cc
DO
2
REG.
H a ll P la te
Amp
DOB
3
GND
4
Pin Assignment
276
Front View
1 : Vcc 2 : DO 3 : DOB
Name Vcc DO DOB GND
P/I/O Pin # P O O P 1 2 3 4
Description Power Supply Input Output Pin Output Pin Ground
12
3
4
4 :GND
AH276Q Rev. 1
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JANUARY 2007
(c) Diodes Incorporated
AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Absolute Maximum Ratings ( @ TA=25C )
Characteristics Supply voltage Reverse VCC Polarity Voltage Magnetic flux density Continuous Output "on" current* Hold Peak (Start Up) Operating temperature range Storage temperature range Package Power Dissipation (SIP-4) Maximum Junction Temp Thermal Resistance (SIP-4)
*Note: 4. Pd shall be within Safety Operation Area.
Symbol VCC VRCC B Io TA Ts PD Tj
Rating 20 -20 Unlimited 0.4 0.5 0.7 -20~+85 -65~+150 550 150 227
Unit V V
A C C mW C C/W
jc
Ta Tj
ja jc
Tc
Electrical Characteristics (TA=+25C)
Characteristic Supply Voltage Output Zener Breakdown Output Saturation Voltage Output Leakage Current Supply Current
Note:
Symbol Vcc Vz Vce(sat) Icex Icc
Conditions (Note 5) (Note 6) Vcc=14V, IL=400mA Vce=14V, Vcc=14V Vcc=20V, Output Open
Min 3.5 7
Typ 35 0.6 <0.1 16
Max 20 0.9 10 25
Units V V V A mA
5. The output DO/DOB is switching as magnetic field change (S>300G, N<-300G). 6. Vz is a typical value for design reference. Vz will vary with different coils design.
AH276Q Rev. 1
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JANUARY 2007
(c) Diodes Incorporated
AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Magnetic Characteristics (TA=+25C, VCC=14V, Note 7)
A grade Characteristic Operate Point Release Point Hysteresis B grade Characteristic Operate Point Release Point Hysteresis C grade Characteristic Operate Point Release Point Hysteresis
Note: 7.
Symbol Bop Brp Bhy Symbol Bop Brp Bhy Symbol Bop Brp Bhy
Min. 10 -50 Min. 5 -70 Min. -100 -
Typ. 75 Typ. 75 Typ. 75
Max. 50 -10 Max. 70 -5 Max. 100 -
Unit Gauss Gauss Gauss Unit Gauss Gauss Gauss Unit Gauss Gauss Gauss
Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.
DO ( Output Voltage ) ( Output Voltage )
DOB
Vcc
( off-state )
( off-state )
Vcc
Turn off
Bhy
Turn on
Turn on
Bhy
Turn oFF
( on-state )
( on-state )
Vsat
Vsat S N Brp 0 Bop S
N
Brp
0
Bop
( Magnetic flux density B )
( Magnetic flux density B )
AH276Q Rev. 1
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JANUARY 2007
(c) Diodes Incorporated
AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Performance Characteristics (SIP-4L)
TA (C) PD (mW) TA (C) PD (mW)
P D (m W ) 600 500 400 300 200 100 0 0 25 50 75 85 100 125 150 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
P o w e r D is s ip a tio n C u rv e
Marking Information
( Front View ) Part Number
276
Y WW X x
Internal code a~z : Lead Free Y :Year: "1" = 2001 "2" = 2002 WW : Nth week : 01~52 X : Version : Q
AH276Q Rev. 1
5 of 6 www.diodes.com
JANUARY 2007
(c) Diodes Incorporated
AH276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
Sensor Location ( unit: mm )
Active Area Depth
Marking side 1.1 0.1mm
Package Sensor Location
1.95 0.1mm
0.7mm
1
2
3
4
Package Information ( unit: mm )
276
IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products 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 our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
AH276Q Rev. 1
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JANUARY 2007
(c) Diodes Incorporated

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