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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 undervoltage protection.

Key Features

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

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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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ML4435 Sensorless BLDC Motor Controller www.fairchildsemi.com Features • Proprietary back-EMF sensing commutation technique for motor communication without hall effect sensors • PWM pulse-by-pulse current limiting to protect motor and FET drivers • Stand-alone operation; motor starts and stops with power applied to the IC* • Soft-start function limits start-up current • PWM speed control for efficiency and minimum FET sizing • Onboard under voltage lock out and power fail detect • Tach output senses commutation of the motor Description The ML4435 provides all the circuitry for sensorless speed control of 3 phase Brushless DC Motors.