I would like to design a 3.7 - 12 V, 3 A adjustable supply with 12V input. The output voltage is to be controlled by 0-5V signal.
My thought was to use a buck regulator like the LM2678-ADJ or similar. And control the feedback with the 0-5V signal. Are there any ideas on how to approach this? Or, is there a better or common solution for this?
My first shot at this used an OPA548 but when operating at outputs of 4V or so it is just too hot and I would like to avoid paralleling an additional op-amp. So, would like to find another solution.
Thanks for your help!