Sensorless BLDC controller enhances diagnostics, protection

ALLEGRO A4960three-phase, sensorless, brushless dc (BLDC) motor controller, for use with external N-channel power MOSFETs, is driven using block commutation (trapezoidal drive) where phase commutation is determined, without the need for independent position sensors, by monitoring the motor back-emf. A programmable motor start-up scheme allows device to be adjusted for a wide range of motor and load combinations.

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