电源设计要求, 适配器输入12V电源, 系统需要有 1.2V, 1.8V , 3.3V 5V, 几种电压规格, 有没有性价比好的一款芯片,
通过调整比例电阻来实现这几种电压的输出. 是否需要两极DCDC来实现, 一级为 12V转5V, 二级为5V转 1.2V, 1.8V, 3.3V
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