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LM5180: FFM模式下,输出电压纹波较大

Part Number: LM5180

输出负载在10mA,24V时。会出现10K左右的纹波,幅值在150mV左右。该纹波已经影响了系统正常工作。实测LM5180工作在FFM模式,并有明显的跳频。现在更换变压器(漏感)和加一定的假负载(进入DCM)可以解决。但是我想明白根因是什么,FFM模式下,如果按照规格书推荐的电路,环路增益的传函是什么?相频和幅频增益是怎么样的。?