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UCC3895: UCC3895 OUTC OUTD 占空比失衡

Part Number: UCC3895

Dears:

   在使用UCC3895做全桥控制时,单母线交流电压超过380V以上时,OUTC OUTD输出的占空比会失衡,不能维持在50%的占空比,导致电流出现很高的尖峰,测出的波形图如下:帮忙看下什么原因,谢谢!

   1是电流波形,2,3,4对应OUTB OUTC OUTD