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TPS54020 5V-3.3V 電流上不去

請問各位:

                 我用TP54020想要設計 5V-3.3V 10A 的轉換器,可是負載往上送超過3.5A輸出電壓就崩潰成0V,並且輸出電壓會隨著負載增大而往下降,例如:3A時電壓就下降到只剩3.1V,請各位幫忙分析一下原因。

如下是我的電路圖