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变压器降压,增加输出功率



你好,我现在想寻找一个方案,就是220v交流电输入,然后想不用变压器,将其变为3.3V直流电压,最大输出电流不少于250mA,但是一直都没有找到合适方案,有人告诉我说不用变压是达不到这样的功率的,我不太理解这句话,求解。。。。。。