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TPS55340芯片输出电压达不到想要的结果

Other Parts Discussed in Thread: TPS55340

我在尝试使用TPS55340芯片进行升压,12.07V的输入,输出电压为11.94V,我的RSH为277.5k,RSL为10K,按道理应该输出35V左右的电压才对,FB脚测量电压为0.4V,SW脚的波形为高电平与小段类似于消顶的正弦波的混合。请问这是怎么回事,下面的图为PCB和SW上的波形