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UCC28950 Soft start 时六路驱动同时关闭

Other Parts Discussed in Thread: UCC28950

UCC28950 软启动开机时,有发现六路驱动同时关闭的情况,很奇怪,轻载时都会出现

由此会导致副边同步整流MOSFET 失效。谢谢

CH1,CH4是次级同步驱动信号; CH2是四个初级MOSFET的其中之一的驱动信号; CH3IC UCC28950 Soft start pin的电压波形