PRELIMINARY ML4435 Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4435 provides all the circuitry for sensorless speed control of 3 phase Brushless DC Motors.
Controller functions include start-up circuitry, Back EMF commutation control, Pulse Width Modulation (PWM) speed control, pulse-by-pulse current limiting, motor coasting, and under-voltage protection.
Motor starting is accomplished by commutating the motor at a low frequency to produce low speed motion.
The low speed motion is used to generate a Back EMF signal.
A back EMF sampling circuit locks on to the motors position and controls commutation timing by forming a phase locked loop (PLL).
The commutation control circuitry...

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