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TL494的硬件PID中PI模拟器

Other Parts Discussed in Thread: TL494

做了一个用TL494实现闭环的恒流源,虽然能稳定,但是示波器看出来它的占空比步进制很大,上网查了下好像是外部的Feedback端的那两个电阻和一个电容决定了硬件的模拟PI值,但是具体的P=?  I=?  的公式我没有查到,如果有知道情况的能告诉我一下吗?给我说一下那篇论文里提到过也行。