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TPS54620: 输出不稳定

Part Number: TPS54620

下图是我设计的TPS54620电路,焊完器件调试时发现输出不稳定,空载输出,且图中DAC1AM处断路。输出电压正常应该是0.8V乘15=12V,结果发现在9.55V-13V之间波动。测量VSENSE反馈电压,发现并不稳定,在0.63V-0.86V之间波动,请问这是因为什么原因会这样?该如何解决这个问题?