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TL2575 ADJ 5V 1A输出带载频率不对



用TL2575 ADJ 做降压  输出5V 1A ,spec里频率52KHz,  我做出来后 空载频正常,一带载频率就只有几K。 看电感波形正常,但是MOS电压开关波形不规律,有的打开了又有个很小的关断时间然后继续打开。  

这有哪些原因呢?我layout已经铺了很大面积铜。