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UCC28910 fly-buck 电路设计求解

Other Parts Discussed in Thread: PMP9176

参考PMP9176设计了一款辅助电源,直流输入250-400V,电路基本没有改动。Ipk端我直接接的GND,应该是输出600mA时才保护才对,我的输出电流很小,输出电阻减小后,输出电压也跟着减小??以下是测量数据和电路图:

输出电阻:800、700、600、500、400、300、200、100

输出电压:9.39、8.37、7.60、6.35、5.7、4.9、3.25 、1.6