EVL6563S-250W STMicroelectronics

AN3119 Application note 250 W transition-mode PFC pre-regulator with the new L6563S Introduction This application note describes a demonstration board based on the new transition-mode PFC controller L6563S and presents the results of its bench evaluation. The board implements a 250 W, wide-range mains input PFC pre-conditioner suitable for desktop PCs, industrial SMPS, flat screen displays, and all SMPS having to meet the IEC61000-3-2 or the JEITA-MITI standard. Figure 1. EVL6563S-250W: L6563S 250W TM PFC demonstration board November 2010 Doc ID 16849 Rev 2 1/32 www.st.comContents AN3119 Contents 1 Main characteristics and circuit description . 4 2 Electrical diagram . 6 3 Bill of material 7 4 Test results and significant waveforms 10 4.1 Harmonic content measurement . 10 4.2 MOSFET current, TM signals, and L6563S THD optimizer . 13 4.3 Voltage feed-forward and brown-out function 15 4.4 Startup operation . 19 4.5 PFC OK pin and feedback failure (open-loop) protection 20 4.6 TBO (tracking boost option) . 22 4.7 Power management and housekeeping functions 23 5 Layout hints . 25 6 Thermal map 26 7 EMI filtering and conducted EMI pre-compliance measurements . 28 8 References 30 9 Revision history . 31 2/32 Doc ID 16849 Rev 2