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LM5036: 起机时,REF电压时序错误

Part Number: LM5036


Vaux2波形在小于TH之前,REF电压应该钳位到地,见下图。

但遇到一个现象,REF电压(绿色)在Vaux2(黄色)小于TH之前无法钳位到地。

请问,造成REF电压时序不按照芯片介绍的预偏置电压启动的原因是什么?