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TMS320F28035: 打绝缘耐压总是损坏,有什么建议

Part Number: TMS320F28035

用的28035做35kW电源,PEC+LLC两颗28035来实现,在打绝缘耐压2000V的时候DSP会有损坏,目前已经有8pcs损坏,下面是原理图。想请问下这个针对绝缘耐压2000V,设计的时候哪个引脚需要有什么注意事项吗?