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UCC28750: 变压器如何计算

Part Number: UCC28750

大家好,UCC287506DBVR的问题

输入:120Vdc-400Vdc,全范围CCM连续模式,临界点设定在400V最小占空比0.23,最低电压输入120V占空比50%

输出:24V-4A                频率:100K           反射Vor:120V                   最大占空比:50%

变压器采用ER35/42,材料PC40,Ae=110,磁感应强度0.2,得到变压器电感值355uH,初级匝数50,次级匝数10,

问题是:电压越高,带负载能力越强,电压越低带负载能力越差,全范围变成了DCM模式,请问是哪里出了问题?