SA276
BRUSH-LESS DC-FAN DRIVER WITH ON-CHIP HALL SENSOR
DESCRIPTION
SA276 mainly designed for electronic commutation of brush-less DC
fan. This IC internally includes the Hall Plate, Regulator, Pre-Amplifier,
Comparator, and a pair of complementary open-collector Outputs (DO,
DOB).
SA276 internally includes power-reverse protecting diode, the
protecting diode only protects chips but not for coils. If necessary, add
one external diode to block the reverse current from coils.
TO - 94
12
34
FEATURES
* On-chip hall sensor
* Wide operating voltage: 3.5V to 20V
* 400mA (avg) output sink current
* Build-in power-reverse protecting diode only for reverse power
connecting
ORDERING INFORMATION
Device
SA276
Package
TO-94
APPLICATIONS
* Dual coils brush-less DC fan
* Dual coils brush-less DC motor
* Revolution counting
* Speed measurement
BLOCK DIAGRAM
2
4
PRE
AMP
DO
GND
DOB
V
CC
1
REG
Hall
3
ABSOLUTE MAXIMUM RATINGS
(T
amb
=25°C)
Characteristics
Supply Voltage
Reverse Vcc Polarity Voltage
Magnetic Flux Density
Output
Current
On
Continuous
Hold
Peak (start up)
I
omax
Symbol
V
CC
V
rcc
B
Value
25
-25
Unlimited
400
500
700
Unit
V
V
G
mA
mA
mA
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV: 1.2
2008.09.27
Page 1 of 5
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