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请教关于LM3488驱动SEPIC架构的问题

输入:15VDC

输出:12VDC/1.5A

问题:VDS不时会出现如图所示的现象(电感会有异响),此类波形之间的间隔大概有几十mS;如果负载减轻,则此现象会消除;

架构:SEPIC  独立电感

CH3:VDS   CH4:VGS

请问造成此类现象的问题是什么?

谢谢!