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UCC27714损坏

Other Parts Discussed in Thread: UCC28950

移相全桥电路,UCC27714DR做驱动,驱动部分电路如图

在测试时,开关频率50kHz,开环控制,死区时间定为500ns,在切换占空比的过程中,经常出现驱动芯片(UCC27714DR)烧坏的情况,有时会有桥臂上MOS管烧坏短路情况,请问这个是什么原因导致的?(控制芯片用的TI的UCC28950)