Green
AH276Q
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.
Pin Assignments
( Top View )
276
1 : Vcc
2 : DO
3 : DOB
1 2
3
4
4 : GND
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)
Applications
Dual-coil Brush-less DC Motor
Dual-coil Brush-less DC Fan
Revolution Counting
Speed Measurement
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.
Typical Applications Circuit
Brush-less DC Fan
AH276Q
Document number: DS31066 Rev. 6 - 2
1 of 6
www.diodes.com
September 2013
© Diodes Incorporated
AH276Q
Pin Descriptions
Pin Name
V
CC
DO
DOB
GND
P/I/O
P
O
O
P
Pin #
1
2
3
4
Function
Power Supply Input
Output Pin
Output Pin
Ground
Functional Block Diagram
1
V cc
DO
2
REG.
H a ll P la te
Amp
DOB
3
GND
4
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
CC
V
RCC
B
Io
Ts
PD
T
J
Supply Voltage
Reverse VCC Polarity Voltage
Magnetic Flux Density
Output “on” Current
(Note 3)
Storage Temperature Range
Package Power Dissipation (SIP-4L)
Maximum Junction Temperature
Thermal Resistance Junction-to-Ambient (SIP-4L)
Thermal Resistance Junction-to-Case (SIP-4L)
Continuous
Hold
Peak (Start Up)
0.4
0.5
0.7
-65 ~ +150
550
+150
227
49
Parameter
Rating
20
-20
Unlimited
A
C
mW
C
C/W
C/W
Unit
V
V
JA
JC
Note:
3. P
D
shall be within Safety Operation Area.
T
A
T
J
Tc
JA
JC
AH276Q
Document number: DS31066 Rev. 6 - 2
2 of 6
www.diodes.com
September 2013
© Diodes Incorporated
AH276Q
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
CC
T
A
Note:
Parameter
Supply Voltage (Note 4)
Operating Ambient Temperature
Conditions
Operating
Operating
Min
3.5
-20
Max
20
+85
Unit
V
C
4. The output DO/DOB is switching as magnetic field change (S>300G, N<-300G).
Electrical Characteristics
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
Z
V
CE(SAT)
I
CEX
I
CC
Parameter
Output Zener Breakdown
Output Saturation Voltage
Output Leakage Current
Supply Current
V
CC
= 14V, I
L
= 400mA
V
CE
= 14V, V
CC
= 14V
V
CC
= 20V, Output Open
Conditions
Min
—
—
—
7
Typ
35
0.6
<0.1
16
Max
—
0.9
10
25
Unit
V
V
µA
mA
Magnetic Characteristics
(Note 5) (@T
A
= +25°C, V
CC
= 14V, unless otherwise specified.)
A grade
Symbol
Bop
Brp
Bhy
Characteristic
Operate Point
Release Point
Hysteresis
Min
10
-50
—
Typ
—
—
75
Max
50
-10
—
Unit
Gauss
Gauss
Gauss
B grade
Symbol
Bop
Brp
Bhy
Characteristic
Operate Point
Release Point
Hysteresis
Min
5
-70
—
Typ
—
—
75
Max
70
-5
—
Unit
Gauss
Gauss
Gauss
C grade
Symbol
Bop
Brp
Bhy
Note:
Characteristic
Operate Point
Release Point
Hysteresis
Min
—
-100
—
Typ
—
—
75
Max
100
—
—
Unit
Gauss
Gauss
Gauss
5. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.
DO
( Output Voltage )
( Output Voltage )
DOB
V
cc
( off-state )
( off-state )
V
cc
Turn off
B
hy
Turn on
Turn on
B
hy
Turn oFF
( on-state )
( on-state )
V
sat
V
sat
S
N
B
rp
0
B
op
S
( Magnetic flux density B )
3 of 6
www.diodes.com
September 2013
© Diodes Incorporated
N
B
rp
0
B
op
( Magnetic flux density B )
AH276Q
Document number: DS31066 Rev. 6 - 2
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
