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PMP7760 参考设计中带载问题

我们有设计一款输入要求12-270V,输出12V  3.5A的LED电源模块,参考设计是PMP7760,测试发现,输入电压在12-60V 时,如果要保持输出电压在12V,负载电流最高只能在0.5A,再往上递增,输出电压就会逐步下降,我们尝试将限流电阻值调低也没效果,求解答,谢谢!