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Fairchild's smart power module boosts power factor correction

Posted: 19 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:firchild semiconductor? fsab20ph60? smart power module? spm? power factor correction switching converter?

Fairchild Semiconductor says its FSAB20PH60 smart power module (SPM) is the industry's first to implement the so-called Partial Power Factor Correction Switching Converter (PSC) topology (power factor correction circuit operating at twice the mains frequency). This PFC-SPM module, which finds particular advantages in 1kW to 3kW air conditioners, triggers its IGBTs every half cycle of the line current to provide 0.97 power factor correction in compliance with IEC61000-3-2, and, according to the company, better characteristics for rejecting EMI (electromagnetic interference) than higher frequency switching topologies.

"The partial switching method is very popular in 1kW to 3kW air conditioners, however, utilizing discrete componentsthe only currently viable alternative to the new PFC-SPMrequires more assembly time and the required additional heat sink complicates and encumbers the design process," said Taehoon Kim, vice VP of the High Power product line. "Combining our new PFC-SPM with our Motion-SPM provides our customers with a highly cost-effective solution for improving design productivity and ultimately, the dependability of their products."

This PFC-SPM combines four rectifier diodes, two IGBTs, a gate-driving IC and a thermistor in a single, thermally efficient module. The device's compact (44-by-26.8mm) direct bonded copper (DBC) substrate package is identical in size and configuration to the motor control (Motion-SPM) module. The two modules are designed to be mounted side-by-side to share a single heat sink, thus simplifying designs, speeding assembly and improving overall system reliability. Fairchild says the PFC-SPM's advantages include low thermal resistance (Rth): 2.8C/W for the IGBTs, and 2.6C/W for the diodes with the aid of the DBC substrate; low acoustic noise; 2,500VRMS isolation; and a gate-driving IC with under-voltage and over-current protection for increased system reliability.

The PFC-SPM comes in a Pb-free Mini-DIP package. It's priced at $13.48 each in 100 pieces. Delivery is 12 weeks ARO.

- Vince Biancomano


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