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我们目前28V转5.5V使用的DC-DC buck电路电感有啸叫的现象，测量输出纹波发现除了有开关频率以外还有一10几K左右的低频正弦波。
黄色通道为交流耦合20M带宽的纹波
紫色通道为电感撬起来靠近电容处焊线量的电流
另TPS40170里面手册中推荐的24V转5V 6A输出的环路补偿部分怎么和用补偿工具算出来的不一致？
