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ImplementingtheTL431feedbackloopImplementingtheTL431feedbackloopChristopheBASSOMOTOROLASPS,ToulouseCenterAvenueEisenhower,BP1029,31023TOULOUSECedexFrance33(0)561199012;e-mail:R38010@email.sps.mot.comThispaperdetailsthenumerouswaystoimplementafeedbacknetworkwithanoptocouplerandaTL431whenimplementingshuntregulators.Dependingontheconfigurationofthedevicesandthemethodusedtomeasuretheopen-loopresponse,someunusualresultsmayappear.TheshuntregulatorTheoptocouplerisusedaloneanddeliverssomecurrenttoashuntregulatorsuchasimplementedbytheMC3337XseriesortheMC44608.Inthesedevices,theduty-cycleDCisadjustedbyinjectingacurrentintoafeedbackpin(FB).Whenthecurrentisloworzero,theduty-cycleispushedtothemax(74%fortheM……