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TPS55340 升壓問題

Other Parts Discussed in Thread: TPS55340

您好,

          目前依照TPS55340 SEPIC EVM規劃,請問其中的蕭特基二極體是什麼作用?為什麼內阻會影響輸出?

           使用了相同型號的二極體,但是內阻為130ohm左右的可以正常升壓輸出(11.8V),若二極體內阻為90ohm左右的輸出確變成只有(2.97V)

            請問這跟Layout有影響嗎?謝謝.