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关于lm5005输入电压高于58v 烧管子的问题?

Other Parts Discussed in Thread: LM5005

问题:

输入电压 VIn:20--40v之间时,输出13.4v时,无论是负载为轻载上电(Iout = 0.1A)  和重再上电(Iout = 1A) 都没有问题。

当输入电压 VIn 为58v时, 输出13.4v,无论轻载和重载,只要上电重复1--3次,管子就烧坏。现象 17 和 18 和 19 sw 端和 Gnd 端短路了!

电路图和pcb见附件