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设计一款DCDC输出13.9V，下图是其中一部分电路，帮我分析下这个电路的功能，谢谢其中：DC13.9V是输出正电压；GND_12V是输出负端；SS是芯片的引脚；DC10V是辅助电源过来的；U6引脚上标的电压是空载时用万用表测得电压值
这个电路是在次级的，它的PCB是下图
