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20W 5V Evaluation Board using ICE2QR2280Z

This application note is a description of 20W switching mode power supply evaluation board designed in a quasi resonant flyback converter topology using ICE2QR2280Z Quasi-resonant CoolSET® .The target application of ICE2QR2280Z are 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 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.

• 7.47 MB
• 2012/08/13