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UCC28060: 输出480W 可以带一半负载,带不起满载,超过一半(240w)PFC电感会有响声

Part Number: UCC28060

HP-IDP480 PQ3220-PFC电感.pdf 在设计一款UCC28060交错式PFC,480W,在计算电感是280UH,匝比是8/1,但是装上去试,带一半负载(240w左右)可以,超过240W电感有响声,马上要出样品,比较着急!请问前辈是什么问题?附件为电感图纸