EVAL2QR0665G28W16VTOBO1: 16V @ 1.75A, 85 ~ 265 VAC

This reference design from Infineon Technologies, is a description of 28W switching mode power supply evaluation board designed in a quasi-resonant flyback converter topology using ICE2QR0665G Quasi-resonant CoolSET. 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.

The CoolSETTM-Q1 series (ICE2QR0665G) is the first generation of quasi-resonant integrated power ICs. It is optimized for off-line switch mode power supply applications such as LCD monitor, DVD R/W, DVD Combo, Blue-ray DVD, set top box, etc. Operating the MOSFET switch in quasi-resonant mode, lower EMI, higher efficiency and lower voltage stress on secondary diodes are expected for the SMPS. Based on the BiCMOS technology, the CoolSETTM-Q1 series has a wide operation range (up to 25 V) of IC power supply and lower power consumption.