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The AH287 is an integrated Hall sensor with output
drivers for brushless DC motor application. This IC
consists of two complementary outputs for motor’s
coil driving and has automatic lock protection and
auto- restart function relatively. To avoid coil burning,
rotor lock shutdown protection circuit shut down the
output driver if the rotor blocked and then the
automatic recovery circuit will try to restart the motor.
This function repeats while rotor is blocked. Until the
blocking is removed, the motor recovers running
normally. In addition, the auto-restart time is flexible
by adjusting the capacitance (CCT).
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Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold BOP, the
DO is turned to sink and DOB is turned to drive. This
output state is held until a magnetic flux density
reversal falls below BRP, causing DO to be turned to
drive and DOB turned to sink.
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This IC is available in TO-94 package.