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UCC21750: UCC21750 LT-SPICE仿真问题

Part Number: UCC21750

我在LT-SPICE仿真时的AIN引脚以及DEAST的内部电流源没有起作用,是什么原因呢?按照原理,我将电源全部接上,而且不存在报错加外部有回路的情况下,应该可以检测到正确电流的。这是我的仿真图,希望得到你们的帮助。