High-Voltage, Programmable-Gain Current Monitor

Abstract:Thiscircuitmonitorscurrentflowathighvoltage(48Vandhigher)usingastandard5Vdifferenceamplifier(MAX4198)referencedtoground.Italsoemploysadigitalpotentiometer(MAX5402)forgainadjustment.Maxim>AppNotes>AmplifierandComparatorCircuitsDigitalPotentiometersKeywords:high-voltagecurrentmonitors,differenceamplifiers,adjustablegain,pnptransistors,digitalpotentiometersDec21,2010APPLICATIONNOTE4546High-Voltage,Programmable-GainCurrentMonitorAbstract:Thiscircuitmonitorscurrentflowathighvoltage(48Vandhigher)usingastandard5Vdifferenceamplifier(MAX4198)referencedtoground.Italsoemploysadigitalpotentiometer(MAX5402)forgainadjustment.AsimilarversionofthisarticleappearedintheJune1,2007issueofPET.Telcom,LDMOS,automotive,andnumerousotherapplicationsrequirethemeasurementofcurrentflowathighvoltages(high-sidecurrent).Often,acircuitoperatingat5Vmustmonitor