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TPS62056 SW脚震荡

Other Parts Discussed in Thread: TPS62056

使用TPS62056,为设备7.2V电池转3.3V电源转化。

现在发现个问题,上电后电感有吱吱的响声。用示波器看SW脚,发现震荡了,但是输出是很平稳的。下图是该脚的波形

我想改变负载看下该脚波形,后级串了个10K的可调电位器到地,调节电位器,但是SW脚输出波形基本无明显改变。

偶然间在输入端的位置加了个小电阻,发现输出波形了正常了,如下

 下图是我的电路,求教下攻城狮们,这是什么情况?