I want a bench PSU and want to build it on my own.
Here's some spec that I want:
1. compact: I got no much free space on my dormitory desk
![Tongue :P](https://www.eevblog.com/forum/Smileys/default/xtongue.gif.pagespeed.ic.J5mTe0A2NA.png)
.
2. wide input voltage range: 12-24v, can be powered by laptop adapter, PD charger, li-ion packs or etc.
3. relative high power: 0-25V, 0-5A, 50-100w output power.
4. decent noise and stability: <30mv ripple? I got no good idea now. But it won't be rocket scicence anyway.
5. Low cost: Jellybean part should be used so anyone can build one (no LT parts
![Huh? ???](https://www.eevblog.com/forum/Smileys/default/xhuh.gif.pagespeed.ic.6Nvt7O8a11.png)
).
So I think switch regulator should be used, for a voltage greater than input is needed. I decide to try some 4 SW buck-boost controller. It's now common in PD powerbank.
And a linear post-regulator is needed for lower noise and fast CC/CV operate.
I start this thread to record my tries so somebody may learn something and hope some kind people pointed out my mistakes.
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/xsmiley.gif.pagespeed.ic.R8GFI-pF6f.png)
For now I have already done the linear post-regulator schematic. Every compoment can be found in lcsc. Any feed back will be welcome.