Transcription of Basic Calculation of a Buck Converter's Power Stage (Rev. B)
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Basic Calculation of a Buck Converter's Power Stage (Rev. B)
(max)VMaximum Duty Cycle: D =V OUTINVINVOUTIINIOUTCINCOUTLDSWA pplicationReportSLVA477B December2011 RevisedAugust2015 BasicCalculationof a BuckConverter's PowerDC/DCApplicationsABSTRACTT hisapplicationreportgivesthe formulasto calculatethe powerstageof a buckconverterbuiltwith anintegratedcircuithavinga integratedswitchandoperatingin is notintendedto givedetailson the functionalityof a buckconverteror howto compensatea ,see the referencesat the end of this containsthe a BuckConverterFigure1 showsthe basicconfigurationof a buckconverterwherethe switchis integratedin the selectedintegratedcircuit( IC).
necessary to stabilize the input voltage due to the peak current requirement of a switching power supply. The best practice is to use low-equivalent series resistance (ESR) ceramic capacitors. The dielectric material must be X5R or better. Otherwise, the capacitor loses much of its capacitance due to dc bias or temperature.
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