扩大电流检测放大器的输入范围为0V

摘要：添加一个电荷泵提供±5V电源轨运算放大器的内部高边电流检测放大器。这一修改使该放大器感应电流下降到0V的共模输入。可以修改，以适应双向电流检测应用电路。Maxim>AppNotes>AmplifierandComparatorCircuitsPower-SupplyCircuitsKeywords:current-senseamplifier,chargepump,opamp,bidirectionalcurrentsensingSep20,2007APPLICATIONNOTE4078ExtendCurrent-SenseAmplifier'sInputRangeDownto0VAbstract:Addingachargepumpprovides±5Vsupplyrailstotheoperationalamplifierinternaltoahigh-sidecurrent-senseamplifier.Thismodificationenablesthatamplifiertosensecurrentsdownto0Vcommon-modeinputs.Thecircuitcanbemodifiedtoaccommodatebidirectionalcurrent-senseapplications.AsimilararticleappearedintheFebruary15,2007issueofElectronicDesignmagazine.Inadditiontothetraditionallead-acidbattery,modernelectric/hybridcarsoftenincludealargecapacit