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刚刚接触此芯片，请教一下VREF引脚输出电压是固定的吗？电压反馈与设定电压比较之后接入20脚EAP，想请问是如何控制稳压的。过压反馈信号引入到19脚，通过光耦拉低19脚的电位，是这样的控制方式吗？请老师们给指导一下，谢谢！
