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UCD3138-PSFB-EVM27开发板启动瞬间Vo有一个尖峰,是什么原因?

Other Parts Discussed in Thread: UCD3138

您好。

最近在测试UCD3138-PSFB-EVM27开发板,发现开发板启动瞬间Vo有一个尖峰,如下图:

如上图,Vin为380V,QT1为3.3.V给UCD3138供电,Vo输出电压有个尖尖,之后,才能正常启动。

请问,那个尖尖,是怎么产生的?

谢谢。