黄色是PIN2,蓝色是pin4
下图是附件为示波器波形文件
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建议你拿掉输出端的电感先看一下是否还有过冲,如果还有你就用WEBENCH软件优化一下电路
FB是靠近哪个电解电容C21还是C22
你移除了L2之后就没有过冲了么?