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UCC3895: UCC3895: UCC3895 OUTC OUTD duty cycle imbalance

Part Number: UCC3895


   When UCC3895 is used as the full bridge control, when the single bus AC voltage exceeds 380V, the duty cycle of OUTC OUTD output will be unbalanced and cannot be maintained at 50% duty cycle, resulting in high current peaks. The measured waveform diagram and schematic diagram is as follows: please help to see what the reason is, thank you!

1 is the current waveform, 2, 3 and 4 correspond to OUTB OUTC OUTD