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UCC28251使用疑问

Other Parts Discussed in Thread: UCC28251

拓扑:硬开关全桥+全桥整流

副边控制IC:UCC28251

输入电压:36-72V

输出电压:12V

最大功率240W

疑问:加载时OUTA和OUTB发生相位偏移,请问需要修改哪个参数

原理图和波形如下所示:

波形如下所示:

CH1:Uds_S2 CH2::Uds_S4 CH3: Uds_S1 CH4: 原边变压器输入电压

2A软起稳定后

增加负载至3A