I'm a recent graduate EE student and this is my attempt to gain experience and strengthen my resume so I'm eager to figure this out. I'm designing a dual channel floating output bench power supply that will supply 0-32V @ 5A with CC and CV operation modes. I intend on this being a long-term solution so I'm aiming for good power efficiency with a clean output signal. The safety and protection features I plan on including are a microcontroller based emergency thermal shutdown, reverse current protection, overvoltage protection, and of course a fuse.
At first I intended on creating it using IC voltage regulators: switching pre-regulation + second stage linear regulation. My plan was that the switching output would match the linear output to minimize power loss in the linear regulator. The problems with this are wildly varying CC under load and difficulty finding regulators with the desired specifications.
Having decided to check out the few schematics for commercial bench power supplies that I could find, I noticed that they don't seem to use IC voltage regulators at all! This leads me to wonder if it would be easier to create the linear regulator portion with discrete components instead of ICs. I've been having trouble finding resources which discuss the best methods of PSU design so I wanted to come here for a second opinion.
Which method do you think is the best for me to create my desired product? Switching + linear, switching + discrete or something else?
The post here Integrated voltage regulator chip versus discrete circuit utilizing op-amps and power BJTs for DIY bench power supply poses the same question but it doesn't look like there was an answer to the actual question. I looked at it and it seems like they just discussed the safety of using a negative reference voltage.