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LM25088: HG管脚波形问题

Part Number: LM25088

选用LM25088MH-1/NOPB作为24V转5.5V降压输出。

按照手册推荐电路做的原理图如下:

其中MOS管开关信号(HG管脚)的输出波形是这样的:

请问方波中间的类正弦波信号是正常现象吗,应该怎么消除呢?

另外正常上电后电压会有约0.5V的过冲,正在想办法解决。