控制电压调节器的最佳方法是什么

嗨，我想用8MHZ的PIC18F4523控制电压调节器（LT3080）。我想为上述调节器产生一个相当精确的控制电压（2mV步骤）。我想出了两个可能的解决方案，并且希望你能帮助我决定哪一个是最好的。解决方案离子1）使用PWM信号+ RC滤波器+电压跟随器。如果我选择这种方法，PWM频率是最有效的？我需要Op Amp吗？解决方案2)使用直流（像MCP4922）+电压跟随器。如果我选择这种方法，我必须处理什么类型的问题？我真的很想听听你的意见！关于弗朗西斯科C



以下为原文

Hi,
I want to control a voltage regulator (LT3080) using a PIC18F4523 running at 8MHZ.
I would like to generate a control voltage, for the above regulator, that is reasonably accurate (2mV steps).
I came up with two possible solu tions and would like you to help me to decide which one is the best.

Solution 1)
Use a PWM signal + RC filter + voltage follower.
If I choose this method what PWM frequency is most effective? And do I need a very precice Op Amp?

Solution 2)
Use a D.A.C. (like MCP4922) + voltage follower.
If I choose this method what are the kind of issue I have to take care-of?

I would really like to hear you opinion!

Regards
Francesco C