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急问关于UCC28720的问题.

Other Parts Discussed in Thread: UCC28720

使用UCC28720设计反激变换器.输入90-265V AC,输出5V 1A.电路在附件中.测试时发现MOSFET的开关占空比仅有12%,远低于设定值.而且随着负载的加重,电压输出不是稳定的5V,而是从7.5V左右的电压降至4V左右.请问是不是变压器饱和了?还是其他的原因?