所有的不连续方式反激电源都有振荡吗?

MAX5019不连续方式5W反激电源效率太低?振荡能否解决(附波形图)?振荡发生在MOSFET和D都不导通的时间里面,有大侠说这种振荡是不连续方式反激电源不可避免的!

6.5V 50mA,6.5V 150mA,24V 150mA,15V 50mA
我测量的效率只有75%,
mosfet的DS波形:
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