Diodes AH276Q User Manual
A
Green
H276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
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
DO, DOB 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.
Features
On-chip Hall sensor with two different sensitivity and hysteresis
settings for AH276
Built-in protecting diode only for chip reverse power connecting
-20°C to +85°C operating temperature
Lead Free Package: SIP-4L
SIP-4L: Available in “Green” Molding Compound (No Br, Sb)
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Pin Assignments
( Top View )
276
12 43
Applications
Dual-coil Brush-less DC Motor
Dual-coil Brush-less DC Fan
Revolution Counting
Speed Measurement
1 : Vcc
2 : DO
3 : DOB
4 : GND
Typical Applications Circuit
AH276Q
Document number: DS31066 Rev. 6 - 2
Brush-less DC Fan
1 of 6
www.diodes.com
September 2013
© Diodes Incorporated
A
Pin Descriptions
Pin Name P/I/O Pin # Function
VCC
DO O 2 Output Pin
DOB O 3 Output Pin
GND P 4 Ground
P 1 Power Supply Input
Functional Block Diagram
1
Vcc
REG.
H276Q
DO
2
Hall Plate
Amp
Absolute Maximum Ratings (@T
Symbol Parameter Rating Unit
VCC
V
RCC
B Magnetic Flux Density Unlimited
Io
Ts Storage Temperature Range -65 ~ +150
PD Package Power Dissipation (SIP-4L) 550 mW
TJ
JA
JC
Note: 3. PD shall be within Safety Operation Area.
Supply Voltage 20 V
Reverse VCC Polarity Voltage -20 V
Output “on” Current
(Note 3)
Maximum Junction Temperature +150
Thermal Resistance Junction-to-Ambient (SIP-4L) 227
Thermal Resistance Junction-to-Case (SIP-4L) 49
= +25°C, unless otherwise specified.)
A
Continuous 0.4
Peak (Start Up) 0.7
T
A
T
J
Tc
DOB
GND
3
4
A Hold 0.5
C
C
C/W
C/W
AH276Q
Document number: DS31066 Rev. 6 - 2
JA
JC
2 of 6
www.diodes.com
September 2013
© Diodes Incorporated
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