february 2011 doc id 16032 rev 4 1/36 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 ! - v & |