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A4945 - Three Phase Sensorless Sinusoidal Fan Driver

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.

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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Datasheet preview – A4945

Datasheet Details

Part number A4945
Manufacturer Allegro
File Size 932.32 KB
Description Three Phase Sensorless Sinusoidal Fan Driver
Datasheet download datasheet A4945 Datasheet
Additional preview pages of the A4945 datasheet.

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Full PDF Text Transcription

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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.
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