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TPS61175異常工作

想請教一下,我用WEBBENCH上的設計做了一個5V->6V/2A的轉換電路,供電是5V/15W

用示波器量測空載時的Vout,發現輸出從0升到5.1V後就掉回0V,然後再次升到5.1V再掉下來,一直重複

是我散熱沒做好還是欠壓或過電流保護了? 5V電源過載保護?

Layout不佳也有會這種現像嗎?

這顆IC是定電流輸出嗎?

謝謝