设计参考的用户指南TPS54620EVM-374，5V转3.3V，在手册推荐电路的基础上做了如下修改：EN引脚悬空，输入电容改为4.7uFX3，输出电容100uFX3，电感选用的2.7uH，其他器件选择与指南相同，电路的输出纹波>100mV，查阅手册这种修改计算值不应该这么大，求教应该如何解决？会不会是因为输入电压太低了
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