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REF5030: REF5030电路设计问题

Part Number: REF5030

麻烦大家帮我看下这个REF5030电路的设计问题在哪里呢

调试时发现,刚开始上电的时候,参考输出是正常的,工作一段时间以后,参考会升高到接近5V

因为需要一个1.5V的偏置点,所以我用5030分压1.5V后接电压跟随参与后续的模拟电路运算