Seals help detect contamination

Written by: Paul Fanning | Published:

The A4941 from Allegro MicroSystems Europe is a three-phase, sensorless, brushless DC motor driver IC designed for fan and blower applications in the white goods and office automation sectors.

Key features of the new device include sensorless commutation, a wide (5-16 V) supply voltage range, 1.25 A peak output current, -40 to 105°C operating temperature range, lock detection with auto restart, and soft switching for reduced audible noise. The motor drive system in the A4941 consists of three half-bridge NMOS outputs, back EMF sensing circuitry, adaptive commutation control and a state sequencer.

The sequencer determines which output devices are active, while the back EMF sensing circuits and adaptive commutation circuits determine when the state sequencer advances to the next state.

This material is protected by MA Business copyright see Terms and Conditions.
One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

Related Content



Allegro Microsystems Europe

Please view our Terms and Conditions before leaving a comment.

Change the CAPTCHA codeSpeak the CAPTCHA code