This application note describes a demonstration board based on the transition-mode PFC controller L6563S and presents the results of its bench demonstration. The board implements a 100 W, wide-range mains input, PFC pre-conditioner suitable for ballast, adapters, flatscreen displays, and all SMPS having to meet the IEC61000-3-2 or the JEITA-MITI regulation. The L6563S is a current-mode PFC controller operating in transition mode (TM) and implementing an internal high-voltage startup circuitry.