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LM3488: LM3488电源芯片,设计5V输入,200V输出异常

Part Number: LM3488

根据参考电路设计,刚上电,MOS烧毁。MOS管的VDS耐压是240V,LM3488设置频率电阻为40K。

当更换MOS后,把配置RFA改为100K,输出电压改为7.2V输出。芯片工作正常,。请问如果设计5V输入,200V输出,LM3488工作频率设计应该为多少呢?