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关于TPS53355DQPT负载电流抽不上去的原因

理论设计的负载电流为20A,但是现在实际抽载电流只有13A左右时,输出电压就会shutdown(抽量测输出波形上面看有点类似hiccup)。

是发生OCP的了吗?但是有调大过Trip电阻,结果还是不行。

请各位大神帮忙看一下到底是什么原因?感谢啦....