EVL6564-100W

AN3009 Application note How to design a transition mode PFC pre-regulator using the L6564 Introduction The transition mode (TM) technique is widely used for power factor correction in low and medium power applications, such as lamp ballasts, high-end adapters, flatscreen TVs, monitors and PC power supplies, and all switched-mode power supplies that must meet harmonics reduction regulations. The L6564 is the latest proposal from STMicroelectronics for these types of applications, which may require a low-cost power factor correction solution. The L6564 is a current-mode power factor correction (PFC) controller that operates in transition mode and embeds all the functions needed to control and properly protect a high- performance PFC converter into a very compact 10-pin SSOP-10 package. Figure 1. L6564 PFC controller in an SMPS architecture 60366036 &LQ&LQ 3)&3)& (0, (0, ILOWHUILOWHU U U 3)& FRQWUROO H H / / - V February 2011 Doc ID 16032 Rev 4 1/36 www.st.com 3)& FRQWUROO V & & & & &219&219 9 & 9 &Contents AN3009 Contents 1 Introduction to the power factor correction (PFC) . 4 2 Operating the transition mode PFC (boost topology) 6 3 Designing a transition mode PFC 8 3.1 Input specification 8 3.2 Operating conditions 10 3.3 Designing the power section 11 3.3.1 Rectifier bridge 11 3.3.2 Input capacitor 11 3.3.3 Output capacitor 12 3.3.4 Boost inductor 13 3.3.5 Power MOSFET selection and dissipation . 15 3.3.6 Boost diode selection . 18 3.4 L6564 biasing circuitry . 19 4 Design example using the L6564-TM PFC Excel spreadsheet 30 5 EVL6564-100W demonstration board 33 6 References 34 7 Revision history . 35 2/36 Doc ID 16032 Rev 4