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TPS54331负载超过300mA后电压迅速下降的问题

Other Parts Discussed in Thread: TPS54331

设计要求输入12V 输出 5V2A,电路参数用 WEBENCH仿真没有问题,但是实际板子只能带 300mA左右,负载继续加大电压会迅速下降!12V电源有两个470uF的电解电容;电感是用HSM54-4R7M工字型电感,直流电阻0.06R,最大电流2.6A;续流二极管1A左右,拆掉也没啥变化,不知是何原因引起,求解!

这片TPS54331底部没有焊盘,也不至于是接地引起的,匪夷所思