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LM3409 FET驱动疑问,出现烧MOS问题

文档的17页有一个关于FET电路的图 Figure 27. External Parallel FET Dimming Circuit。我目前电路是输入58V,输出54V 4A,我参考Figure 27的电路图。采用以下参数Coff是470P, Roff1:69.8k,Roff2:4.3K,VDD:12V.2个二极管用SS510。 一上电,电源直接保护,断电逐个检测,发现P管、N管烧了。后来去掉FET电路,换上新P管和电流 采样电阻。系统恢复工作。请问是我的二极管用错还是怎样?为什么会导致烧管子的?