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LM5176输入小于17V时输出振荡

Other Parts Discussed in Thread: LM5176
您好!我们按照WEBENCH参考设计,用LM5176实现输入9-36V,输出15V的Buck-Boost电源电路,原理图见附件。
现在调试时发现,输入电压大于等于17V时输出才能稳定输出,9-17V范围输出一直振荡,输出波形见附件。
请帮忙分析一下问题原因,谢谢!