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A5941 - Three-Phase Sensorless Fan Driver

General Description

The A5941 three-phase motor driver incorporates sinusoidal drive to minimize audible noise and vibration for mediumpower fans.

A sinusoidal voltage profile is applied to the windings of the motor at startup to quietly start and gradually ramp up the motor to the desired speed.

Key Features

  • AEC-Q100 qualified (K version).
  • Quiet startup.
  • 180° sinusoidal drive for low audible noise.
  • High-efficiency control algorithm.
  • Sensorless operation.
  • Wide supply voltage range.
  • FG speed output.
  • Lock detection.
  • Overcurrent protection.
  • Soft start.
  • Short-circuit protection.

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Full PDF Text Transcription for A5941 (Reference)

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A5941 Three-Phase Sensorless Fan Driver FEATURES AND BENEFITS • AEC-Q100 qualified (K version) • Quiet startup • 180° sinusoidal drive for low audible noise • High-effici...

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et startup • 180° sinusoidal drive for low audible noise • High-efficiency control algorithm • Sensorless operation • Wide supply voltage range • FG speed output • Lock detection • Overcurrent protection • Soft start • Short-circuit protection PACKAGES: 10-Pin SOIC with Exposed Pad (suffix LK) DESCRIPTION The A5941 three-phase motor driver incorporates sinusoidal drive to minimize audible noise and vibration for mediumpower fans. A sinusoidal voltage profile is applied to the windings of the motor at startup to quietly start and gradually ramp up the motor to the desired speed. The voltage profile is set to a default value