So I have been toying with the idea of making a -30 to +30V linear programmable power supply. I have tested the
OPA549 High power opamp to do this thing but I was disappointed by the current regulation and the thermal performance (1.4 deg c/W JC-CS) thus with an extremely good heatsink (<= 0.1deg c/w) It was only able to sink / source 80W max.
Then there is the
LT1970 circuit that is floating around. I have trown it in LTSPICE and have done some simulations. The problem that I have with it is limited voltage range and the high price of the part.
When
Kevin.D answered in my previous OPA549 topic that it might be better to build a discrete mosfet push pull circuit I got interested... So what do you do when you want to find more info about such a method ?? Lets open
The art of electronics third edition . So after a bit of researching I opened LTSPICE and started simulating some stuff.
After some
![Tweak :-/O](https://www.eevblog.com/forum/Smileys/default/smiliey_cal.gif)
and
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif)
I simulated this:
![](http://i.imgur.com/evhvWCl.png)
In the simulation it works good and accurate on high and low currents and voltages, sinking and sourcing of current (four quadrant operation).\
Sadly I had none p channel mosfets to test it out on a breadboard so the simulation is all I can do at the moment.
I have yet to add current limiting to the ltspice simulation. I have ordered some P and N channel mosfets to do breadboard testing.
What do you guys think?
note: I'm not good at this stuff
![Tongue :P](https://www.eevblog.com/forum/Smileys/default/tongue.gif)
ltspice file:
https://mega.co.nz/#!8MczBDTK!wTBD6CJnTTrEex-II5YXSoH-Y1BeaP4jr0anc4BG90w
The simulation software is ltspice. To use my simulation you need the PSPICE parts from
IXYS (for installing search for LTSPICE third party .lib on google).