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A4942 - Three-Phase Sensorless Fan Driver

General Description

TheA4942 three phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications.

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

This allows accurate setting of maximum and minimum speeds via selection of external resistors.

Key Features

  • Sensorless (no Hall sensors required).
  • Closed loop speed control.
  • Minimal external components.
  • PWM speed input.
  • FG speed output.
  • Lock detection.
  • Soft start.
  • Overcurrent protection.
  • Soft switching for reduced audible noise Package: 20-contact QFN (suffix ES) Not to scale.

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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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A4942 Three-Phase Sensorless Fan Driver FEATURES AND BENEFITS • Sensorless (no Hall sensors required) • Closed loop speed control • Minimal external components • PWM speed input • FG speed output • Lock detection • Soft start • Overcurrent protection • Soft switching for reduced audible noise Package: 20-contact QFN (suffix ES) Not to scale DESCRIPTION TheA4942 three phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications. A closed loop speed control system is integrated into the IC. This allows accurate setting of maximum and minimum speeds via selection of external resistors. The speed is controlled by duty cycle demand applied to the PWM input. The PWM input is allowed to operate over a wide frequency range.