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A4945 - Three Phase Sensorless Sinusoidal Fan Driver

General Description

The A4945 and A4949 three phase motor drivers incorporate sinusoidal drive to minimize audible noise and vibration for medium power fans.

A Speed input is provided to control motor speed.

This allows system cost savings by eliminating an external variable power supply.

Key Features

  • 180° sinusoidal drive for low audible noise.
  • High efficiency control algorithm.
  • Sensorless operation.
  • Analog Speed input (A4945).
  • PWM Speed input (A4949).
  • Wide supply voltage range.
  • FG speed output.
  • Lock detection.
  • Overcurrent protection.
  • Soft start.
  • Short circuit protection.

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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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A4945 and A4949 Three Phase Sensorless Sinusoidal Fan Driver FEATURES AND BENEFITS • 180° sinusoidal drive for low audible noise • High efficiency control algorithm • Sensorless operation • Analog Speed input (A4945) • PWM Speed input (A4949) • Wide supply voltage range • FG speed output • Lock detection • Overcurrent protection • Soft start • Short circuit protection PACKAGES: DESCRIPTION The A4945 and A4949 three phase motor drivers incorporate sinusoidal drive to minimize audible noise and vibration for medium power fans. A Speed input is provided to control motor speed. This allows system cost savings by eliminating an external variable power supply. Alternatively, power supply modulation down to 4 V can be used to adjust motor speed.