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TPS54821做的BUCK, 输入5-15V，输出5V/5A, 当TPS54821输入低于5.5V以后，输出就不稳？作为BUCK，如果输入太低，以至于输出无法达到设定目标值5V的时候，理论上讲，BUCK的上管直接开通就可以了，为什么该芯片到最大占空比之后，就关掉了？不能设置为直通模式吗？还是参数设置有问题？
