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求大神解析一下参考原理图，反馈电路的工作原理。
8407.TPS23754-EVM USERGuider.pdf
TL431 输出端稳定输出一个电压，然后 光耦出 2脚就是 TL431输出的电压，然后需要输出的就会参考这个电压，发光体发光 线性反馈回去！
