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共用一路电源的话如何不影响后级的输出



需要做一个12V输入双路输出的电源板,12V输出共用输入,利用LM2596-5输出5V,这种后级12V、5V双输出模块10组,如何能够确保在每一组工作的时候不影响其他的模块的正常输出啊,尤其是12V的输出,12V电源电流在30A左右,后级输出的12V、5V输出电流格为1A左右!