For quite some time I'm thinking about to design/make a lab supply, which passes the LED test
1. In layman's terms, that means decent transient load performance with no/minimal output capacitors.
Last year October, the light bulb came on: try to adapt the current feedback topology to a lab-supply regulator. Since then, I'm playing simulation and experimenting with new ideas/parts/etc.
At this moment, I consider the design mature enough to present it to the public.
This idea/design is original AFAIK, therefore (I think)can be patented, which I want to prevent it by releasing as public domain; if I'm wrong on the subject of originality, I will gladly stand corrected and provide apologies to the original idea owners.
To make the subject even more clear: I claim ownership on the application of the current feedback idea in the single polarity/asymmetrical applications, that's what I'm releasing here in public domain.
The files:
CFB_PSU.asc - LTSpice simulation
opa810_a.zip - TI's OPA810 macro model, NOT included with LTSpice; the simulation uses two of them; the power connections used in simulation are reversed from the original.
CFBPSU_CAD.png - the original CAD(Carbon Aided Design) drawing
![Evil >:D](https://www.eevblog.com/forum/Smileys/default/evil.gif)
PSU_SCchematix.png - the current schematic as time of writing
As it stands, the behaviour of the simulation is oriented to have fast reaction in CV mode; the fast CC mode is just bonus.
Feel free to ask questions, comment on the subject; I will try to give answers/reasons/ideas on the subject.
A few of screenshots previously posted in an other tread(
https://www.eevblog.com/forum/projects/fast-cccv-power-supply-take-two/?all):
Reaction to a 1A->1.5A load change, current ramp 1A/µs
![](https://www.eevblog.com/forum/projects/fast-cccv-power-supply-take-two/?action=dlattach;attach=1890178)
Same load, with a 330µF/50mΩ(ESR) capacitor on the output
![](https://www.eevblog.com/forum/projects/fast-cccv-power-supply-take-two/?action=dlattach;attach=1890225)
Current limiting output
![](https://www.eevblog.com/forum/projects/fast-cccv-power-supply-take-two/?action=dlattach;attach=1890172)
Current limit on the load(green) and on the sense resistor(blue) without output capacitor
1LED test: PSU output
@max(>30V)&on, current limit@20mA, connect the LED, and the LED has to survive