VIPer35无法以完全未知的原因启动

我和VIPer35面临着一个奇怪的情况。首先，我购买了STEVAL-ISA183V1评估板，以了解VIPer35的工作原理。然后我使用定制变压器制作了我的第一个原型PCB，也可以正常工作。但是当我在PCB上使用相同的原理图（但不是相同的PCB布局）应该是最后一个并包含其他电路时，VIPer35无法以完全未知的原因启动。是的，看起来很明显的答案是最新的PCB布局不是最佳的，甚至有一些错误。我试图将组件从旧PCB移动到新PCB但没有任何成功。最后我决定在面包板上制作相同的电路（见下文），当布线是一切都是最佳的，甚至令我惊讶地工作！



问题PCB上的VIPer35 DRAIN输出如下所示（青色迹线）。 AUX辅助输出黄色迹线。


电路原理图如下所示，旧PCB和新PCB上也是如此：


我想知道是否有人知道为什么VIPer35不想启动（在我看来他正在检测一些故障情况并开始不断启动序列）。
非常感谢任何类型的答案。

编辑：我忘了说输入电压（DC_BUS）是100 Vdc，在所有情况下都使用相同的（旧PCB，“故障”PCB和面包板）。此外，我想补充一点，对我来说，最简单的方法就是简单地制作另一块PCB，并将旧的工作原型与PCB布局相结合，但在这种情况下，我无法了解问题的根源是什么，它看起来更像是一个纯粹的运气。



以下为原文

I'm facing a strange situation with VIPer35. First, I bought STEVAL-ISA183V1 evaluation board to got an idea how VIPer35 works. Then I made my first prototype PCB using custom made transformer that also works fine. But when I use the same schematic (but not the same PCB layout) on the PCB that should be the final one and include other circuits, VIPer35 cannot start for completely unknown reason. Yes, it looks like obvious answer that latest PCB layout is not optimal or even has some errors. I tried to even to move components from old PCB to new one but without any success. Finally I've decided to make the same circuit on the breadboard (see below) when wiring is everything the optimal and even that surprisingly to me works!




VIPer35 DRAIN output on problematic PCB is shown below (cyan trace). Yellow trace is output from AUX secondary.



The circuit schematic is shown below and the same is on the old and new PCB:



I'm wondering if anyone have any idea why VIPer35 doesn't want to start (it seems to me that he is detecting some fault condition and initiate continuously start up sequence).
Many thanks in advance for any type of answer.

EDIT: I forgot to say that input voltage (DC_BUS) is 100 Vdc, the same is used in all cases (old PCB, "faulty" PCB and breadboard). Also, I'd like to add that for me is the easiest way to simply make another PCB incorporating PCB layout from old working prototype, but in that case I cannot learn what is a source of my problem and it looks more like a pure luck.