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DCP020503SU电路使用问题。

DCP020503SU电路使用问题,采用标准5V适配器供电按照如下链路连接硬件后,得不到想要的3.3V电压,在电路可接受输入电压范围调整输入电压,输出电压随着变化。当输入电压为5V2时,输出电压为3V9;当输入电压为5V时,输出电压为3V8;当输入电压为4.7时,输出电压为3V6。请问问题出在哪里?后端负载电路攻击连接两片422功能电路,四个放大器,一个数模转换电路,以及3只隔电路。负载足够。不存在因为负载不够而导致输出电压未被降额的原因。