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如何强制一个BUCK DC/DC进入DCM模式?

Other Parts Discussed in Thread: LM20123

我把DC/DC的输出接了一个电阻,输出电流应该只有2mA,测试芯片SW脚电压波形,还是CCM模式下的波形,

感觉2mA已经很小了啊,应该低于CCM模式的电流边界了,但还是不能进入DCM模式,

想问一下,有什么办法能强制进入DCM模式呢?想看一下DCM模式下SW脚的波形啊