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UCC27714: H桥驱动波形失真

Part Number: UCC27714

图1:PSpice for TI 仿真原理图

图2:前几个驱动波形畸变;

图3:H桥的供电电压提升到300V后,高侧驱动波形完全畸形

我需要在电路上需要做哪些调整?

Please help me if you can。