寻找一个备用电源IC,即掉电后此IC还能提供3s时间左右的电。
基本要求:输入电压24V或者更大,输出电流:400mA(大点更好),输出电压小于等于24V(越大越好,可调的也行)。主要目的是给电路掉电后供电使用的。求牛人指点
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