Sensorless BLDC driver needs no software

January 30, 2019 //By Christoph Hammerschmidt
Sensorless BLDC driver needs no software
Allegro Microsystems Europe has introduced a new family of controller ICs for brushless DC motors. According to the vendor, this is the first of its kind that does not require any software control algorithms written by the customer. Plus, it provides low audible noise operation, hence its name: QuietMotion.

Whereas most FOC BLDC drivers require software developers to code the algorithm in a microprocessor, QuietMotion devices integrate Allegro’s proprietary Field Oriented Control (FOC) algorithms. These algorithms allow for smooth, quiet motion while eliminating the need to write software. This significantly lowers R&D expenses and reduces time to market. With only five external components, these devices also minimise bill of materials (BOM) cost, improve reliability and reduce design complexity. The result is a quiet, easy to implement, and efficient outcome. 

The first member of Allegro’s QuietMotion family is the  AMT49406, which is targeting applications that demand high efficiency and low acoustic noise, such as pole and ceiling fans, humidifiers, dehumidifiers, air purifiers and exhaust fans. With its embedded proprietary windowless sinusoidal algorithm and soft-on-soft-start algorithms, the AMT49406 offers audible noise performance.

The A89301 is also part of the QuietMotion family. This device offers ultra-quiet operation, as well as additional flexibility and programmable features for premium appliances, such as high end appliance fans, high end ceiling fans and air purifiers. The A89301 is specifically targeted at systems with low speed requirements.

The AMT49406 and the A89301 have a 5.5 to 50 input voltage rating with an operating range of -40° to 105°C. They are available in a 24-contact 4 mm x 4 mm QFN with exposed thermal pad (suffix ES), and a 24-lead TSSOP with exposed thermal pad (suffix LP). These packages are lead (Pb) free, with 100% matt-tin leadframe plating.  

More information: AMT49406 and A89301 

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