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并联稳压器提高功率放大器的电流限制精度

上传者: 2022-09-18 00:56:44上传 PDF文件 35.59 KB 热度 10次

摘要:代替通常的晶体管在功率放大器电路的分流稳压器(U1),提高了限流精度。

Maxim>AppNotes>CIRCUITPROTECTIONPOWER-SUPPLYCIRCUITSKeywords:shuntregulator,currentlimit,poweramplifier,adjustableshuntregulatorJul26,2006APPLICATIONNOTE3867ShuntRegulatorImprovesPA'sCurrent-LimitAccuracyAbstract:Substitutingashuntregulator(U1)fortheusualtransistorinthispower-amplifiercircuitimprovesthecurrent-limitaccuracy.Addingcurrent-limitingcircuitrytoanemitterfollowerprotectsboththepasstransistoranddownstreamcircuitryfromexcessivecurrentdamage.Theclassicwaytoimplementsuchcurrentlimitingistoaddaballastresistorbetweenthepasstransistor'semitterandthecircuitoutput,andthenmonitortheresistordropwithasmall-signaltransistor.SeeR4andQ2inthepoweramplifier(

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