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TPS40077 驱动mosfet 发热问题

12V输入 5V输出 最大输出电流在3A左右,MOSFET为IRF7832 上电一分钟不到  两个mosfet管发热严重,另外,哪位大神给我解释下TDS40077这个芯片的工作原理啊?感觉自己理解的不对!谢啦!