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A4942 - Three-Phase Sensorless Fan Driver

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.

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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Datasheet preview – A4942

Datasheet Details

Part number A4942
Manufacturer Allegro
File Size 0.96 MB
Description Three-Phase Sensorless Fan Driver
Datasheet download datasheet A4942 Datasheet
Additional preview pages of the A4942 datasheet.

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Full PDF Text Transcription

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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.
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