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TPS40210升压,20V-300V,芯片不停的重启

如题,完全按照参考设计做的电路板,现在RC脚输出频率正常,后面倍压电路,我只焊接了一次倍压。输入20V,通电后,芯片就在不停的重启,测试Vout,也是上升到80V左右后就掉下了。不知为什么,请大神指导下啊!