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UC3843 输入20V时,无法正常工作

根据设计软件设计,画原理图,现在实物板测试,发现输入20V,UC3843 6脚有一个非常小的占空比,8脚也是一个幅值为5V的方波,随着电压升高,占空比增加,直到大约80V左右,8脚才能有5V输出,找不到头绪,大家帮我看看。 网址:webench.ti.com/.../webench5.cgi