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UCC28950驱动问题

Other Parts Discussed in Thread: UCC3895, UCC28950

最近调试UCC2890时发现A,B驱动波形正常,而C,D驱动会出现大小波,主要表现在BOOST模式情况下,具体表现为boost时,D管的驱动宽度有时很窄,有时正常,这样导致C管有时会比较比较宽的驱动,请问这是芯片固有的特性吗?