AN3027 Datasheet, PDF (1/41 Pages) STMicroelectronics – How to design a transition-mode PFC pre-regulator

AN3027
Application note
How to design a transition-mode PFC pre-regulator
with the L6563S and L6563H
Introduction
The transition-mode (TM) technique is widely used for power factor correction in low and
middle power applications such as lamp ballasts, high-end adapters, flatscreen TVs and
monitors, PC power supplies and all SMPS having to meet regulations in harmonics
reduction. The L6563S and L6563H are the latest devices from STMicroelectronics for these
applications that may require a low-cost power factor correction.
The L6563S is a current-mode PFC controller operating in transition mode (TM). Packaged
in the same SO14 pinout as its predecessor L6563, it offers improved performance and
additional functions. The L6563H is the SO16 pinout version, embedding the same features
as the L6563S with the addition of a high-voltage startup power source.
These functions make the L6563H especially suitable for applications that need to be
compliant with energy-saving regulations and where the PFC pre-regulator works as the
master stage without an auxiliary SMPS.
Figure 1. Typical system block diagram
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February 2011
Doc ID 16134 Rev 4
1/41
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