Shut Down a Current-Sense Amplifier via Its Supply Pins

Abstract:Youcanshutdownacurrent-senseamplifierbyconnectinganNMOStransistorinitsgroundpathanddrivingitwithlogic-levelsignalscapableofturningthetransistorONandOFF.WhenONtheamplifieroperatesnormally,butwhenOFFitshutsdownbecauseitsgroundisfloating.Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:current-senseamplifiers,batteryoperation,NMOStransistors,shutdownDec10,2010APPLICATIONNOTE4544ShutDownaCurrent-SenseAmplifierviaItsSupplyPinsBy:ArpitMehtaPrashanthHolenarsipurAbstract:Youcanshutdownacurrent-senseamplifierbyconnectinganNMOStransistorinitsgroundpathanddrivingitwithlogic-levelsignalscapableofturningthetransistorONandOFF.WhenONtheamplifieroperatesnormally,butwhenOFFitshutsdownbecauseitsgroundisfloating.AsimilarversionofthisarticleappearedintheNovember11,2007issueofPowerElectronicsTechnologymagazine.Unliketraditionalopamps,thehigh-sidecurrent-senseamplifierdoesn'tincludea