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AN728

Part Number	AN728
Manufacturer	Vishay Siliconix
Description	Designing A Flyback Converter
Published	Mar 26, 2005
Detailed Description	AN728 Vishay Siliconix Designing A Flyback Converter with Si9113 for Feeding the TE from U-Interface In ISDN Nitin Kalj...
Datasheet	AN728 PDF File

Overview

AN728 Vishay Siliconix Designing A Flyback Converter with Si9113 for Feeding the TE from U-Interface In ISDN Nitin Kalje and Tony Lai INTRODUCTION The efficiency of the converter powering the NT is extremely important, even at power levels of a few milliwatts.
To achieve 60% efficiency with an 80-mW output, the allowable power loss in the converter is less than 54 mW.
The components of these losses include the dc and switching losses in the semiconductors, the transformer, quiescent current overhead in the control chip, current and voltage sense networks, power losses from the ripple current through the input and output capacitor ESR, resistive losses in the PCB traces, and any external co...

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