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TPS5430 接大负载时发烫,且VSENSE无法稳在1.22V



空载时都好好的,我给它接了个8欧的负载,VSENSE便掉到1.12V左右,并且芯片发烫严重,换个芯片还是这样,请问这可能是什么原因导致呢?

新手不是很会用软件。。于是手绘了我接的电路图,请各位见谅。。

盼回复,非常感谢。。