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使用DCDC降压芯片TPS54540，输入12V，输出5V，测试输出电压值正常。电感前，电感后波形分别如下。
疑问：开关电源芯片输出不应该是方波吗？为什么会出现一段震荡的波形？对于纹波质量是否会有影响？
