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UCD3138PSFBEVM的PWR050A电路在Vin为405V时输出电压PIN6 Vinmonitor异常

您好。

我在测试UCD3138PSFBEVM开发板时,遇到一个异常现象。

手册中说Vin的过压保护点时410V,

当我测试vin为405V时,发现辅助电源板PWR050A的输出电压PIN3和PIN6等不稳定,出现振荡。

不知是什么原因?是PWR050A的R46电阻值偏小,高压空载时,反馈信号较弱易受干扰吗?

谢谢。