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AN-PS0071-EVAL-QR0665G-28W16V

This application note is a description of 28W switching mode power supply evaluation board designed in a quasi resonant flyback converter topology using ICE2QR0665G Quasi-resonant CoolSET® . The target application of ICE2QR0665G is for set-top box, portable game controller, DVD player, netbook adapter and auxiliary power supply for LCD TV, etc. With the CoolMOS® integrated in this IC, it greatly simplifies the design and layout of the PCB. Due to valley switching, the turn on voltage is reduced and this offers higher conversion efficiency comparing to fixed frequency hard-switching flyback converter. With the DCM mode control, the reverse recovery problem of secondary rectify diode is relieved. And for its natural frequency jittering with line voltage, the EMI performance is better. Infineon’s digital frequency reduction technology enables a quasi-resonant operation till very low load. As a result, the system efficiency over the entire load range is significantly improved compared to conventional free running quasi resonant converter which implements with only maximum switching frequency limitation at light load. I

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2.34 MB
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12/03/2012