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General Description Features
The YH279 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 sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a tem-perature compensation circuit to compensate the tem-perature 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).
·z On-Chip Hall Sensor
·z 4.0V to 18V Supply Voltage
·z 250mA (avg) Output Sink Current
·z Build in Over Zener Diodes Protect Outputs ·z -20oC to 85oC Operating Temperature
·z Low Profile TO-92S (SIP-3L) Package
Applications
·z Dual-Coil Brushless DC Motor
·z Dual-Coil Brushless DC Fan
·z Revolution Counting
·z Speed Measurem
YH177
SZYHM