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ML4435

Micro Linear
Part Number ML4435
Manufacturer Micro Linear
Description Sensorless BLDC Motor Controller
Published May 7, 2005
Detailed Description PRELIMINARY ML4435 Sensorless BLDC Motor Controller GENERAL DESCRIPTION The ML4435 provides all the circuitry for sensor...
Datasheet PDF File ML4435 PDF File

ML4435
ML4435

Overview
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 also outputs a speed feedback signal used in the speed control loop.
The speed control loop consists of an error ampliļ¬er and PWM comparator that produces a PWM duty cycle for speed regulation.
Motor current is limited by a pulseby-pulse PWM shutdown comparator that is tripped by the voltage across...


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