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UCC28070: UCC28070升压至大于500V设计问题

Part Number: UCC28070


我想使用UCC28070器件在输入220V AC时 将直流母线稳定至660VDC输出,实际的样机能够在设定为400V、450V时均正常工作,但设定大于500V母线时 输出不能稳压运行,实际监测不到过压及过流的保护情况。请问有什么可能的原因导致直流电压在大于500V时的不稳定。有无可能是环路补偿的原因,如何确定问题的原因?