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关于UC384X系列开关电源芯片的Pspice模型?

各位好,我最近在学习开关电源,准备现在ORCAD上仿真实现,但是仿真元器件库中并没有UC384X系列开关电源芯片,可以从什么地方下载呢?还是需要自己创建一个?