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ucc28950 开关频率变化

Other Parts Discussed in Thread: UCC28950

你好:

如下是我抓取的上电波形 UCC28950 没有采用同步整流  OUTE OUTF 悬空  DCM 接地 采用倍流整流   驱动管开关频率发生变化?这是什么原因呢

波形说明

1: OUTC
2: OUTD
3: MOS管 Q4 DS
4: D35倍流整流二极管反向电压