Transcription of Design Guide for Off-line Fixed Frequency DCM Flyback ...
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Design Guide for Off-line Fixed Frequency DCM Flyback ...
Design Note DN 2013-01 January 2013 Design Guide for Off-line Fixed Frequency DCM Flyback Converter Allan A. Saliva Infineon Technologies North America (IFNA) Corp. DCM Flyback 2 Design Note DN 2013-01 January 2013 Edition 2013-01 Published by Infineon Technologies North America 27703 Emperor Blvd, suite 310, Durham, NC 27703 Infineon Technologies North America Corp. 2013 All Rights Reserved. Attention please! THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMEN-TATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION.
For wide range operation use a DC link capacitor more than 2uF per watt of input power so as to get a better quality of DC input voltage. With the input capacitor chosen the minimum DC input voltage (DC link capacitor voltage) is obtained by: (1) Where: dcharge is the DC link capacitor duty ratio, typically around 0.2.
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