ML4435 Datasheet | Micro Linear

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 mutation control, Pulse Width Modulation (PWM) speed control, pulse-by-pulse current limiting, motor coasting, and under-voltage protection. Motor starting is acplished by mutating 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 mutation timing by forming a phase locked loop (PLL). The mutation control...