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UCC28950做的移相全桥启动问题以及不能带载。

Other Parts Discussed in Thread: UCC28950

用UCC28950做的DCDC移相全桥(60V输入,27V输出,1kW)需要将启动电容Css加到2uF(官方手册中是150nF)以上才能建立空载电压27V,小了则不能闭环。调节负载到26W以上则输出变为0。可能是什么问题?2型环路补偿已经经过仔细的计算了,应该没有问题。