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请问一个关于UC3854的问题

Other Parts Discussed in Thread: UC3854

最近学习PFC,看了UC3854的手册,对芯片的第5脚乘法器输出有点疑惑,我想请问一下 ,可不可以把第5脚和外部的0.25欧姆电流检测电阻断开?

  • 你好:

             PFC的作用是使电流与电压相位同步,如果将5脚和外部的检测电阻断开,无法检测到电流的控制量,即使4脚没

    有断开,从而无法迫使电流跟随电压的波形,实现PFC。