I'm currently working on a beefed up bench version of Dave's uSupply. Well, the only thing it really has in common with the uSupply is the analog stage, but I digress... I'd like to see if I can add a separate sense return i.e. a Kelvin connection as part of the feedback loop. In particular, I'd love to move the current shunt downstream of the supply so that the dummy load doesn't conflate its readings, and to do that the voltage sense has to happen after the shunt to get precise line regulation.
It seems like the obvious way to do it is to make the voltage op-amp's feedback come from the sense wire, instead of the set pin. Is this a good idea? Does it harm stability? If it works, does it end up making the LT3083 just an expensive pass transistor?
The first picture is the original schematic which is more or less just a higher-current version of the uSupply output stage. The second one is the "improved" version. More illustrative than anything, I have no idea if it'll work...