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SN6501不工作,怎么回事,紧急求救!!!!!!!!!

Other Parts Discussed in Thread: SN6501, LMR62421

刚设计个新的隔离电源,采用SN6501,应用原理图很简单,接上变压器就是没振荡信号,芯片脚空的时候,也测不到振荡信号,用手摸下第三脚,就振荡起来,放开手又没动静,是不是芯片问题,我输入的是5V,第4-5脚接地,2脚接电源5V