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tps54260失效问题

Other Parts Discussed in Thread: TPS54260

第一级电源用tps52460,53V转12V。后一级用MP1584EN(Vinmax为28V)12V转5V。

失效后MP1584EN(SOP8封装)Vin引脚断开且封装有个烧毁点。

测量TPS54206输出不短路,从PCB上取下TPS54260,用万用表二极管档测量Vin和PH电压为0.452V,测量新的TPS54260,该电压为0.536V、0.541V。

请问:

失效后输出为0V。

1、TPS54260内部上管的体二极管Vf正常为多少V,为什么会减小为0.452V?

2、TPS54260输出到使用100uF/16V钽电容,钽电容也烧毁,是不是失效时输出端有高压?