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LM3478应用问题求助

Other Parts Discussed in Thread: LM3478

最近用LM3478设计了一个升压电路,输入12~17V,输出31.5V,6A。按照网站设计制作电路后,
出现电流达不到设计要求的问题,现象如下:
电路带载,(负载为LED灯板)。导通电路,逐渐减小负载电阻,提高输出电流,当
输出电流超过2A时,芯片进入过流保护,电路不工作。

请大家指教下,问题出在哪里,谢谢!

附上电路图