The EVL101G50FLT is a 50 W high-power-factor (HPF) quasi-resonant flyback converter with isolated secondary-side regulation for both constant voltage (CV) and constant current (CC) modes. The board is based on HVLED101 and SEA05LTR. The use of sensor-less GaN transistor (ISG6107QA) and planar transformer ensures high efficiency and compactness. The board can be used as a 50 W single-stage LED driver or PSU.