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关于TPS40211带载问题

您好!我有个应用,就是DC 11V-15V输入,要求带载10W-30W,我用EVM板测试时,发现输出带18W以内时,效率和占空比都不错,但当我带载11串2并的LED灯时,带载大于18W以后,占空比大于0.5以上,我想问一下,怎么去调节这个占空比,使这个芯片可以带载到30W左右.谢谢.