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Resonant controller simplifies design, cuts BOM

Posted: 06 May 2009     Print Version  Bookmark and Share

Keywords:resonant controller  PDP TV  zero voltage switching 

FAN7621

Fairchild Semiconductor has introduced a resonant controller that simplifies design, reduces bill of materials and provides advanced protection functions. The FAN7621 suits LCD and PDP TVs, servers, game consoles and LED lighting applications.

Fairchild's new resonant controller integrates a high-side gate-drive circuit, a current-controlled oscillator, frequency- limit circuit, soft start and numerous protection functions in a 16-pin SOP/DIP package. This highly integrated device eliminates the need for expensive external circuitry such as pulse transformers to conserve not only board space but to reduce the cost of the overall design. The FAN7621's internal high side gate-drive circuit offers an added benefit of common-mode noise cancellation, ensuring excellent noise immunity, enabling the application to meet stringent EMI specifications. For further noise immunity, the FAN7621 offers designers a zero voltage switching (ZVS) technique that reduces switching noise and allows the use of a smaller and less expensive EMI filter.

The FAN7621 is designed with robust protection features such as over voltage protection, over current protection, abnormal over current protection and internal thermal shutdown. Other solutions require additional components to achieve the same level of protection, which adds to design time and overall system costs.

The FAN7621's ZVS technique dramatically reduces switching losses in MOSFETs and rectifiers. Compared to conventional hard-switching converter topologies, efficiency is improved by 10 per cent and for applications such as PDP-TVs, efficiency reaches 97 per cent. An added advantage of this ZVS technique is the dramatic reduction in switching noise – at least 5dB – compared to hard-switching techniques.

Get related application notes and technical articles on Power Design India.





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