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LM5023: 辅助电源处于打嗝模式

Part Number: LM5023

设计了一款电源 ,在 输出空载 情况下,辅助电源波形是打嗝模式,查了下手册,说是处于原边电流过流或是过热情况会出现辅助电源打嗝,但测试原边电流很小,也没有出现过热。请有经验的的帮忙分析下,问题出在哪了?谢谢!!!