如附图所示,请问图中电阻R43的作用是什么?
该电路是如何做到将输出电压稳定在设定值的?
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Hi
并联在光耦输入端,可以分流。(设计时,R44取值不大,导致流过光耦的电流很大,可以并联电阻,减小光耦的工作电流。