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A5947-B - Three-Phase Sensorless Fan Driver

General Description

The A5947-B three phase motor driver IC incorporates sensorless sinusoidal drive to minimize vibration for a wide variety of fan applications.

Sensorless control eliminates the requirement for Hall sensors.

A flexible closed-loop speed control system is integrated into the IC.

Key Features

  • AEC-Q100 qualified.
  • Speed curve configuration via EEPROM.
  • I2C serial port.
  • Sinusoidal modulation for reduced audible noise and low vibration.
  • Sensorless (no Hall sensors required).
  • Low RDS(ON) power MOSFETs.
  • 3.3 V / 20 mA linear regulator.
  • PWM or analog speed input.
  • FG speed output.
  • Slew rate control.
  • Lock detection.
  • Soft start.
  • Low power standby mode.
  • Overcurrent protec.

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Other Datasheets by Allegro MicroSystems

Part Number Description
A5947G Three-Phase Sensorless Fan Driver
A5940 Three Phase Sensorless Sinusoidal Fan Driver
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A5944 Three-Phase Sensorless Fan Driver

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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A5947-B Three-Phase Sensorless Fan Driver IC FEATURES AND BENEFITS • AEC-Q100 qualified • Speed curve configuration via EEPROM • I2C serial port • Sinusoidal modulation for reduced audible noise and low vibration • Sensorless (no Hall sensors required) • Low RDS(ON) power MOSFETs • 3.3 V / 20 mA linear regulator • PWM or analog speed input • FG speed output • Slew rate control • Lock detection • Soft start • Low power standby mode • Overcurrent protection • Overvoltage protection PACKAGE: Not to scale DESCRIPTION The A5947-B three phase motor driver IC incorporates sensorless sinusoidal drive to minimize vibration for a wide variety of fan applications. Sensorless control eliminates the requirement for Hall sensors. A flexible closed-loop speed control system is integrated into the IC.