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想利用DAC接到CPU上来控制DC/DC的输出,如何做?请大侠指点

第一种方案:输入12V,输出0V~9V,输出电流2A。

第二种方案:输入24V,输出0V~12V,输出电流2A。

需要说明的是,用软件控制输出电压的多少。

需要DAC来控制DC/DC的输出,请问有没有电路可参考的?

谢谢