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关于UCC28740的工作频率问题

Other Parts Discussed in Thread: UCC28740

本人新手,用UCC28740做的280V/0.4A输出的反激电源,但是芯片的工作频率一直是30KHz左右,提不上去,不知道该芯片的工作频率是不是跟变压器的初级电感量有关?还是与其它的参数有关?因为这个芯片是自动变频的,我满载下的最高频率才30K,不知道是哪出了问题。