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IC用学生电源12V供电，电路参考标准电路，24VAC输入，上电后输出电压就是整流后的，测芯片6脚电压5.25V，4脚2.25，2脚1.67V，8脚没有输出
人家内置基准5V，你的反馈都5。25V了，能有什么输出？仔细查一下你的分压电阻吧。将可调电位器阻值调小点，IC才能工作。
