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TPS40170: 芯片出现很热量比较大的情况

Part Number: TPS40170

24V供电,输出5V,频率用的200khz,MOS用的AON6144,芯片很烫手,无论是空载还是带载发热都很严重,SW引脚如下图所示,可能的问题出在哪里呢?我手里有一块别人的demo板就不会发烫,我对比了一下SW的波形,demo板上升沿和下降沿都平稳很多,不会像我这个采出来抖动很大。