清潔好LED照明的傳統驅動方式酷塑

 LED?????????
?3????????????????PTC?????????????LED?????????PTC?????Rseries??Rparallel?????????IC?LED?????????LED???????????????
?3???????LED??(???3)?????????????????60???????????PTC?????LED????0??40??????40%???LED???????????? LED ??

?3 ??PTC??????????????
??2??????LED???????
?2????2????????????????????IC????????????????????????LED??? Rset?ILED??????IC???????,???????20K???????TLE4241G???IC??????LED???30mA??4??????????????????PTC???????????WHPTC??????????,?????????????4.7K?????????±5?(????)?±3?(?????????)?
?4????????????LED???????Rseries?????????????????,??????????PTC???????????15
K????PTC??????????????????????????(???=Rseries+RPTC=19.5K?+4.7K?=24.2K?)???????23mA? PTC??????????????????????????????????

?4 ??????????
??3??IC??????
??2????3?LED??????IC??????????????????????200mA LED??????5
V???????Vstab????????????? LED?Vstab??????????LED???????Rout?????????????????????????????????????VDiode???LED??????
??????WHPTC??????PTC??????????????????????????

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 Derek Stepan Jersey