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TPS56540芯片烧毁

Other Parts Discussed in Thread: TPS54540, TPS54560

采用外接可编程电源电压为40V供电,TPS54540能够正常工作,多次开关均没有问题。

采用电池模组供电,电压同为40v DC,TPS54540经常烧毁。

采用TPS54560也会出现上述现象,但现象要少。

输入侧的电容值为4.7uF/100V,这是什么原因引起的?浪涌电流?浪涌电压?应如何改进?

输入是按照40V设计,输出为12VDC。应用在24VDC环境下,无论采用可编程电源还是外接电池模组,均没有问题

电源.pdf