AN3027 datasheet(1/41 Pages) STMICROELECTRONICS

Il numero della parte	AN3027

Spiegazioni elettronici	How to design a transition-mode PFC pre-regulator

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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February 2011

Doc ID 16134 Rev 4

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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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