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LM3409-Q1: 芯片引脚接口输出电压和仿真结果一致,输出电流电压错误,想问一下哪里的问题?

Part Number: LM3409-Q1

芯片的各个引脚输出和仿真结果一致,但是输出的最终电流错误,

电路图如下

仿真结果如下

各个引脚的电压都正确,就是最后的输出结果错误.

EN引脚的值是恒定的19v,输出电流电压如下

不是一个直线,电流也比4a的设计结果大,请教怎么解决?layout也会对结果产生影响吗?