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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.

Key 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.

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Datasheet Details

Part number ML4435
Manufacturer Micro Linear
File Size 576.34 KB
Description Sensorless BLDC Motor Controller
Datasheet download datasheet ML4435 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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.