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你好，我做的用UCC35702芯片设计的反激式电源，上图，PWM占空比无法调试，D用示波器看起来在10%的样子，调整调试过程是，实测VFB=4.8V，cF等于1.1V，VSCLAMP=0.84V，频率为52KHz, 示波器看到D为10%左右，更改VFB=4V ,VSCLAMP=2V,VFF=2.4v, ss 脚电压为5V，实测D为15%，请问下是什么问题引起的
