BLDC Fan Drivers Are Code Free And Sensorless

Allegro MicroSystems’ QuietMotion family consists of the company’s first-to-market Field Oriented Control (FOC) brushless dc (BLDC) electric motor controllers that are customer code-free. The devices are designed to provide reliable and efficient low audible noise performance while reducing design cycle time.

 

Eliminating the need to code the algorithm in a microprocessor, QuietMotion devices integrate Allegro's FOC algorithms. Allegedly, this significantly lowers R&D expenses and reduces time to market. Requiring just five external components, the devices also minimize bill of materials (BOM) cost, improve reliability, and reduce design complexity.

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The first member of the family is the AMT49406 for 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 provides reliable, industry-leading 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% matte-tin leadframe plating. 

 

For more details, checkout the AMT49406 and A89301 datasheets. Also, pay a visit to Allegro MicroSystems.

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