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TPS53126的输入电压超过20V后烧毁问题

Other Parts Discussed in Thread: TPS53126

我用TPS53126做了个电源,接12V调试后正常工作了,但需要连接到20电压上去,但瞬间就被烧毁了,是怎么回事啊?

付电路图如下,跟参考设计基本一样的