Micropower Circuit Monitors Positive Supply Current

Abstract:ThefollowingapplicationnoteshowsacircuitthatconvertstheloadcurrentofapositivepowersupplyintoagroundreferencedsignalvoltageusingtheICL7612operationalamplifier.Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:positivesupplycurrent,monitoring,loadcurrent,powersupply,opamp,operationalamplifiers,opJul09,1998ampsAPPLICATIONNOTE69MicropowerCircuitMonitorsPositiveSupplyCurrentAbstract:ThefollowingapplicationnoteshowsacircuitthatconvertstheloadcurrentofapositivepowersupplyintoagroundreferencedsignalvoltageusingtheICL7612operationalamplifier.TheinexpensivecircuitofFigure1convertstheloadcurrentofapositivepowersupplytoaground-referencedsignalvoltage,withoutrecoursetotheinstrumentationamplifier,extrapowersupply,andmatchedsetsofresistorstypicalofsuchcircuits.TheoutputcurrentIO(proportionaltosupplycurrent)flowsthroughROtoproduceVO.Be