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LM2734Z搭建的15V转12V电源不同负载时出现振荡,怎么解决?

如题。电路原理图如下。

在输出端出现锯齿波振荡(下图黄色波形),并伴随电感鸣叫。观察SW引脚的波形(蓝色),发现其处于间歇性振荡状态,间歇周期与输出端锯齿波周期一致。

而调整负载,使其不振荡,再观察SW引脚的波形如下。

恳请TI大牛解惑啊!