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UCC24624: UCC24624次级Vds过压

Part Number: UCC24624
Other Parts Discussed in Thread: UCC256402

我使用UCC256402搭配ucc256402做的300W半桥llc电源。次级使用二极管整流方案已经满功率测试过了。现在问题是换成同步整流后mos坏了,测试次级Vds电压会过压,怀疑是此问题。但是加rc吸收和tvs都没有改善。附上原理图和测试波形。

image.pngimage.png

这是带载1A的,蓝色是输出电压,绿色是Vds波形。过压只在软起发生。

image.png

不知道,有没有可能是UCC256402配置的有问题。急急急