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UCC2897A做电源的静态功耗问题

Other Parts Discussed in Thread: UCC2897A

各位老师好:

    我参考TI官网上的PMP5426用UCC2897A做了个电源,36-72V输入,14V/10A输出,300K的频率。磁芯用的是TDK的PC44PQ2625,变比为9:6,其他器件均与PMP5426一样。满载效率>95%,但是空载测试数据为:36V 输入,静态电流为0.17A;48V输入,静态电流为0.13A;72V输入,静态电流为0.18A。与PMP5426的空载测试结果还是有一定距离的。调了有一段时间了,也把相关参数按照资料上算了之后改过,静态功耗始终调不下去,请教一下各位老师有什么好的建议和意见么?