SA276 Datasheet, PDF (1/4 Pages) Silan Microelectronics Joint-stock – BRUSHLESS DCFAN DRIVER WITH ONCHIP HALL SENSOR

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.
1234
TO - 94
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
VCC 1
REG
Hall
PRE
AMP
2 DO
4 GND
3 DOB
ABSOLUTE MAXIMUM RATINGS (Tamb=25°C)
Characteristics
Supply Voltage
Reverse Vcc Polarity Voltage
Magnetic Flux Density
Output
Current
Continuous
On
Hold
Peak (start up)
Symbol
VCC
Vrcc
B
Iomax
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Value
25
-25
Unlimited
400
500
700
Unit
V
V
G
mA
mA
mA
REV: 1.2 2008.09.27
Page 1 of 5