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AH277A Folha de dados(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

Nome de Peças AH277A
Descrição Electrónicos  On-Chip Hall Sensor
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Fabricante Electrônico  SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]
Página de início  http://www.sifirsttech.com/en/
Logo SIFIRST - SIFIRST TECHNOLOGIES NANHAI LIMITED

AH277A Folha de dados(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

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©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_277A_V1.0
FEATURES
◆ On-Chip Hall Sensor
◆ 3.5V to 20V Supply Voltage
◆ 300mA (avg) Output Sink Current
APPLICATIONS
◆ Dual-Coil Brush-less DC Motor
◆ Dual-Coil Brush-less DC Fan
GENERAL DESCRIPTION
The AH277A is an integrated Hall sensor with output
driver designed for electronic commutation of brush-
less DC motor applications.
The device includes an on-chip Hall voltage, a
Schmitt trigger to provide switching hysteresis for
noise rejection, a temperature compensation circuit to
compensate the temperature drift of Hall sensitivity
and two complementary open-collector drivers for
sinking large load current.It also includes an internal
band-gap regulator which is used to provide bias
voltage for internal circuits.
Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold BOP,
the pin DO will be turned low (on) and pin DOB will
be turned high (off). This output state is held until the
magnetic flux density reverses and falls below BRP,
then causes DO to be turned high (off) and DOB
turned low(on).
AH277A is available in TO-94(SIP-4L) package.
TYPICAL APPLICATION
COIL1
COIL2
1
2
3
4
VCC
DO
DOB
GND
AH277A
470R
470R
2.2uF
2.2uF
Pin Configuration
TO94(Top View)


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