Im looking to construct a dual power supply capable of supply about +/-25V and hopefully up to ~5A. I already have a SMPS capable of 30V but it has only one output terminal.
I have opted for a LM317/LM337 regulator design to keep the adjustability. Unfortunately this limits me to 1A (1.5A MAX) due to the limitations of the LM chips. After searching previous threads I think a buck converter is the way to go here but have never used one before so I have some questions about their use:
- Will i run into any issues connecting the output of the regulator circuit directly to the buck? The only one I can think of is that being a step down, the LM regulator circuit will just need to be set to a higher voltage than the desired final output.
- Ive found only one other reference to this question and without a real clear answer; to boost the current for the negative half of the regulator output, can this be connected to a seperate buck by just reversing the polarities? i.e would the top level circuit look something like this: On a less important note, im looking at grabbing these from ebay as its likely only a one time build and i prefer the finished look of PCB. I have found these two seperate listings for the regulators with the only difference I can note being the OP AMP and a few extra resistors in the second link. any ideas as to what this is for? is this likely to act as some sort of feedback? a buffer? Regulator 1, Regulator 2
Also if there is a less complicated way of achieving this for around the $50 range Im open to suggestions.
Thank you for any and all help