简单，高效，廉价的恒功率驱动器

摘要：双方目前的组合电流检测放大器和倍增器（MAX4211F）感官和负载两端的电压，其输出（POUT的）电压成正比，即这些变量的连续产品的供应，成正比负载的瞬时功率。外部运算放大器产生相应的PWM（脉宽调制）输出信号，控制与负载串联p沟道MOSFET。

Maxim>AppNotes>AmplifierandComparatorCircuitsCircuitProtectionKeywords:constant-powerdrivers,resistiveloads,chopped-DCdrive,opamps,analogmultipliers,current-senseamplifiersNov29,2010APPLICATIONNOTE4523Constant-PowerDriverIsSimple,Efficient,andInexpensiveAbstract:Acombinationcurrent-senseamplifierandmultiplier(MAX4211F)sensesboththecurrentthroughandvoltageacrosstheload,andsuppliesatoneofitsoutputs(POUT)avoltageproportionaltothecontinuousproductofthosevariables,i.e.,proportionaltotheload'sinstantaneouspower.ExternalopampsgenerateacorrespondingPWM(pulsewidthmodulated)outputsignalthatcontrolsap-channelMOSFETinserieswiththeload.Asimilarversionofthisarticl