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UCC28780: datasheet解读

Part Number: UCC28780

从上表可知,最低输入电压对应启机电压,因此IVSL(RUN) =365uA,对应最低输入电压。

   

1,图34在IVSL(RUN) =365uA时,VCST(OPP)比VCST(OPP1)要小很多,为什么公式16在计算Rcs时用VCST(OPP1)计算?不是用IVSL(RUN) =365uA时对应的VCST(OPP)计算?

 2,启机时IVSL(RUN) =365uA,在R(OPP)上产生的偏置电压为R(OPP)*IVSL(RUN) /KLC。为什么公式16在计算Rcs时可以把这个偏置电压忽略??

3,启机时IVSL(RUN) =365uA,因此IVSL(RUN) =365uA,对应最低输入电压。那在图34中IVSL(RUN) 小于365uA的区间内,VCST(OPP1)有什么用?