CrCM PFC Flyback Converter Design. 2. Design Note DN 2013-10. V1.0 January
2013. Published by Infineon Technologies North America. 27703 Emperor ...
Design Note DN 2013-11 V1.0 January 2013
CrCM Flyback PFC Converter Design
Mladen Ivankovic Infineon Technologies North America (IFNA) Corp.
Design Note DN 2013-10 V1.0 January 2013
CrCM PFC Flyback Converter Design
Published by Infineon Technologies North America 27703 Emperor Blvd, suite 310 Durham, NC 27703 All Rights Reserved.
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Design Note DN 2013-10 V1.0 January 2013
CrCM PFC Flyback Converter Design
Table of contents 1 Introduction ................................................................................................................................................. 4 2 Flyback Topology ....................................................................................................................................... 4 3 Flyback Equations ...................................................................................................................................... 5 3.1 Timing relations ...................................................................................................................................... 5 3.2 Power transfer ........................................................................................................................................ 6 4 Component Selections ............................................................................................................................... 7 4.1 Input rectifier bridge ................................................................................................................................ 7 4.2 Transformer ............................................................................................................................................ 8 4.3 MOSFET ................................................................................................................................................ 9 4.4 Output diode ........................................................................................................................................... 9 4.5 Output capacitor ..................................................................................................................................... 9 4.6 Heatsink ................................................................................................................................................ 11 5 CrCM Flyback Example ............................................................................................................................ 12 6 References .............................................................................................................................................. 197 7 Symbols used in formulas ..................................................................................................................... 198
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Design Note DN 2013-10 V1.0 January 2013
CrCM PFC Flyback Converter Design
1
Introduction
Power Factor Correction (PFC) shapes the input current of the power supply to be in synchronization with the mains voltage, in order to maximize the real power drawn from the mains. In a perfect PFC circuit, the input current follows the input voltage as would an equivalent resistor, with no added input current harmonics. This document is intended to discuss the topology and operational mode for low power (
