AH276
Complementary Output Hall Effect Latch
Features
-
On-chip Hall sensor with two different sensitivity
and hysteresis settings for AH276
-
400mA (avg) output sink current
-
Built-in protecting diode only for chip reverse
power connecting
-
-20°C to 85°C operating temperature
-
Low profile 4 pin SIP package
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
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.
Applications
-
-
-
-
Dual-coil Brush-less DC Motor
Dual-coil Brush-less DC Fan
Revolution Counting
Speed Measurement
Ordering Information
AH276 X - X X X
Wafer Body
K: K version Wafer Body
Q: Q version Wafer Body
Package
P: SIP-4L
Lead
L : Lead Free
Packing
Blank : Tube or Bulk
Typical Application Circuit
276
coil1
coil2
1
Vcc
2
3
4
Brush-less DC Fan
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Jul 21, 2005
1/6
AH276
Complementary Output Hall Effect Latch
Absolute Maximum Ratings
( at Ta=25°C )
Characteristics
Supply voltage
Reverse V
CC
Polarity Voltage
Magnetic flux density
Continuous
Output “on” current
Hold
Peak (Start Up)
Operating temperature range
Storage temperature range
Package Power Dissipation
Maximum Junction Temp
Symbol
V
CC
V
RCC
B
Ic
Ta
Ts
PD
Tj
Values
20
-20
Unlimited
0.4
0.5
0.7
-20~+85
-65~+150
550
150
Unit
V
V
A
°C
°C
mW
°C
Electrical Characteristics
(T=+25°C)
Characteristic
Low Supply Voltage
Supply Voltage
Output Zener Breakdown
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Falling Time
Switch Time Differential
Symbol
Vce
Vcc
Vz
Vce(sat)
Icex
Icc
tr
tf
∆t
Conditions
Vcc=3.5V, I
L
=100mA
K version
Q version
K version
Q version
Vcc=14V, I
L
=400mA
Vce=14V, Vcc=14V
Vcc=20V, Output Open
Vcc=14V, R
L
=820Ω, C
L
=20pF
Vcc=14V, R
L
=820Ω, C
L
=20pF
Vcc=14V, R
L
=820Ω, C
L
=20pF
Min
-
3.5
2.5*
-
-
-
-
-
-
-
-
Typ
0.4
-
-
46
35
0.7
<0.1
16
3.0
0.3
3.0
Max
-
20
20
-
-
0.9
10
25
10
1.5
10
Units
V
V
V
V
µA
mA
µs
µs
µs
*The output of DO/DOB will be switched on/off after supply voltage reaching the 2.5V.
Test Circuit
14V
276
RL1
RL2
CL1 CL2
DO
DOB
RL1=RL2=820 Ohm
CL1=CL2=20 pF
Anachip Corp.
www.anachip.com.tw
3/6
Rev.1.0 Jul 21, 2005
AH276
Complementary Output Hall Effect Latch
Magnetic Characteristics
(Ta=+25°C, V
CC
=12V)
K version
Characteristic
Operate Point
Release Point
Hysteresis
Q version
Characteristic
Operate Point
Release Point
Hysteresis
Symbol
Bop
Brp
Bhy
Symbol
Bop
Brp
Bhy
Min.
-
-110
-
Min.
5
-70
-
Typ.
-
-
110
Typ.
-
-
(1mT = 10 Gauss)
Max.
Unit
110
Gauss
-
Gauss
-
Gauss
Max.
70
-5
-
Unit
Gauss
Gauss
Gauss
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 )
N
B
rp
0
B
op
( Magnetic flux density B )
Performance Characteristics (SIP-4)
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 rve
Anachip Corp.
www.anachip.com.tw
4/6
Rev.1.0 Jul 21, 2005
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