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UCC25600带载不启动

Other Parts Discussed in Thread: UCC25600

电源PFC电压400V,LLC输出芯片UCC25600电源输出27V25A谐振频率100K。电源空载开机后带载测试一切正常,Ls=32 ,Lp=192, Cr=39+39nF, Np=22:3。芯片外围Dt=15K,Rtmin=3.3K,Rtmax=430R,Css=470nF.芯片供电VCC=14V。带5A负载开机电源无输出,试过改动缓启动电容,有点效果但不明显,示波器测量缓启动脚电压在1-1.2V震荡,大家能不能帮看看这是什么问题・_・?