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需求：
1 输入电压48v， 输出5~45v可调.
2 输入电源的功率为400w左右，所以需要外置mos的结构
3 需要可以通过单片机来调节输出电压
目前选定了ucc3803 或者uc3843这种类型的芯片不知是否满足要求，最主要是不懂如何使用单片机调节输出，希望多多指点！
