Current-Limit Circuit for the Buck Regulator

Abstract:ThisarticledemonstrateshowtoachievecurrentlimitfortheMAX1692PWMstep-downregulatorbyusingaMAX4173Hcurrent-senseamplifier.

Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSPOWER-SUPPLYCIRCUITSKeywords:currentlimit,currentsenseamplifier,buckregulator,pwm,step-downregulatorDec01,2000APPLICATIONNOTE478Current-LimitCircuitfortheBuckRegulatorAbstract:ThisarticledemonstrateshowtoachievecurrentlimitfortheMAX1692PWMstep-downregulatorbyusingaMAX4173Hcurrent-senseamplifier.AdditionalInformation:qQuickViewDataSheetfortheMAX1692qQuickViewDataSheetfortheMAX4173qSamplesandLiteratureOrderFormqTechnicalSupport:PowerAcurrentlimitcanbeaddedtoastep-downconverterbyusingaMAX4173Hcurrent-senseamplifiertoinjectcurrentintothefeedbacknetwork.D1sharpensthethresholdofcurrent