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关于使用LM3409驱动led的问题

Other Parts Discussed in Thread: LM3409

我设计的电路参考电路是这个

我的sch图是下面这个

输入电容是4.7uf(未标出来)

输入电压 12.6v 2a 

输出 6.25  3.8a

焊接好之后是没问题的,但是之后就发现闪烁,然后自动关闭。用手去感受,发现检测电阻和输入的电容比较烫。等温度降下去之后,打开就一直闪烁,不稳定