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LM5116: LM5116 使用中,频率降低了一半

Part Number: LM5116

LM5116 两快板卡参数一样,就是换了layout布局,发现布局更改后LM5116开关频率降低了一半,更换Rt电阻后是可以增加,但是还是只有计算值的一半左右,请问是什么原因,芯片不能输出理论频率?原来的layout正常,单从layout上没看出很大的问题。