ML4435 Datasheet PDF - Micro Linear Sensorless BLDC Motor Controller Specs

ML4435 - Sensorless BLDC Motor Controller

Datasheet Summary

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.

Features

n Proprietary back-EMF sensing commutation technique for motor communication without hall effect sensors n PWM pulse-by-pulse current limiting to protect motor and FET drivers n Stand-alone operation; motor starts and stops with power applied to the IC.
n Soft-start function limits start-up current n PWM speed control for efﬁciency and minimum FET sizing n Onboard under voltage lock out and power fail detect n Tach output senses commutation of the motor.
Some External Components Requir.

Datasheet Details

Part number	ML4435
Manufacturer	Micro Linear
File Size	576.34 KB
Description	Sensorless BLDC Motor Controller
Datasheet	ML4435 Datasheet
Additional preview pages of the ML4435 datasheet.

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Full PDF Text Transcription

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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.

Published: May 7, 2005 |