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UCC28780这个芯片做的电路怎么降低轻载纹波

Other Parts Discussed in Thread: UCC28780

最近ti大力推介的有源钳位反激芯片UCC28780,选其做一款220VAC转5V10A的电源,在使用后发现重载效果挺好,输出加了一颗1000UF固态电容,重载时纹波也在80mv左右,但轻载时进入SBM、LPM、SBP这三个模式时,纹波压不下来保持在200mv左右,请问这个问题能解决吗,我需要纹波保持100mv以下;

如果甚至要求50mv以下用这块片子是不是不可能达到呢?