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LM5022带载问题

Other Parts Discussed in Thread: LM5022

我用LM5022按评估板搭了个12V输入,20V输出的升压电路(只改动RFB1),空载情况下,输出20V,但一段时间后就掉到12V,加轻载(100mA)输出也不正常,输出电压11.5V左右。
但把电感改为47uH,RSNS改为1.5欧,空载和轻载输出正常。

想请教下前辈,LM5022设定输出电流500mA,那么在空载和轻载下输出不稳定正常吗,或者说LM5022只能在500mA的负载下工作