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Author: Admin | 2025-04-28
Buck Converter: Types, Circuit Design, Working, Modes of Operation, Examples, Losses & ApplicationsThis article discusses Buck converter and all the important things about buck converter. All important points about buck converter i.e. operation, design, losses considerations and efficiency improvement of buck converter is discussed in this article. Let’s start from the very basics of buck converter to its designing.Basics of DC-DC ConverterBuck ConverterBasic Topology of Buck ConverterModes of Operation in Buck ConverterCCM (Continuous Conduction Mode)DCM Mode (Dis-continuous Conduction Mode)Working Operation of Buck ConverterMode 1Mode 2Minimum and Maximum Peak of Inductor CurrentILmin CalculationILmax CalculationTransfer Function of Buck ConverterDesigning of Components and Ratings for Buck Converter Inductor Designing for Buck ConverterCritical InductancePeak Current Rating of InductorSwitch Designing for Buck ConverterVoltage Rating for Switch in Buck ConverterCurrent Rating for Switch in Buck ConverterDiode Design (Shotkey Diode) for Buck ConverterVoltage rating of diode for buck converterCurrent Rating of diode for Buck ConverterCapacitor Designing for Buck ConverterVoltage RatingMinimum Capacitance According to VoltageRMS Current Rating and Minimum Capacitance According to Current Summary TableBuck Converter Design for 12V to 2.5V, 1A Known Data for Designing Buck ConverterSolution for finding the Required Components Inductor Value FindingDiode Values FindingMOSFET Values Selection Capacitor values selection Non-deal Buck Converter Loss ConsiderationStatic loss of MOSFETSwitching Loss of MOSFETMOSFET Gate Drive LossesStatic Loss of DiodeSwitching Loss of DiodeGeneral Inductor’s LossesInductor’s Copper LossInductor’s Core LossesCapacitor’s ESR LossExamples of Buck Design with Losses(Design of non-ideal Buck converter) Example 1(Design of non-ideal Buck converter) Example 2Efficiency improvementBy CapacitorLower Inductor Current RippleLower Gate Drive VoltageUse of Synchronous MOSFETSoft switchingPWM ControllerLay Out ConsiderationMultiphase Buck ConverterAdvantages of MultiphaseBasics of DC-DC ConverterDC-DC converter is a converter which converts the DC voltage level of the input source into another DC voltage level. The DC-DC conversion can be done directly or can be done using alternative way. The alternative way is to invert DC input into AC and rectified back into DC after stepping up or stepping down the AC voltage using step-up or step-down transformer.This way of transforming DC voltage level is way long and difficult. The short and direct method is to convert DC-DC directly using Boost converter or buck
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