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TPS54331: TPS54331DR,输入5V,输出3.8V故障

Part Number: TPS54331

用手册的参考设计选的值,EN脚是自己选的,现在问题是 输入电压高于5.1V时能正常输出3.8,当输入为5V时输出就只有2.8V左右,请问有办法改善这个问题吗?