高电压，可编程增益的电流监视器

摘要：该电路在高电压（48V和更高）使用一个标准的5V差分放大器（MAX4198）参照地面监视电流流。它还采用了增益调整数字电位器（MAX5402）。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