40V to 20V Buck Convertor

May I ask for what appilication or purpose you do that?

@jason9 ...Your Mosfet settings there are not appropriate .... I have adjusted it here for a quick fix so that your circuit is kept alive while you work on it.  http://everycircuit.com/circuit/4692701697277952

Here is a different version to chew over http://everycircuit.com/circuit/6167641197903872

@2ctiby, but you know what a buck converter is and how it functions?

@Hurz...pity you didn't realize that altering the Mosfet configuration could rectify that EC circuit freezing problem.

Magic, you do not have a glue what a buck converter is, but already know what mosfet configuration is needed for. No reason to be a foulmouth.

@hurz ...The configuration was to stop the EC freezing...which was asked for and which it did....two Mosfet variations...so that Jason could carry on working there...just as I described..... and since you know very little about Mosfets, it is time you stopped pretending that you did by telling people how to adjust circuits which contain them. Let's face it ... you did not know about saturation or Ohmic until you read my articles. If you had known, then you would have been describing them as required....None of your descriptions or Mosfet usage has ever made mention of these important aspects.

Hey jason try this, EC doesn't cope well with DC hysteresis. It works better with AC hysteresis. http://everycircuit.com/circuit/6615053360168960

@2ctiby, your changes does stop the converter to do anything. You dont see that but you think it is helpful, which it is not. Anything I can futher clarify for you?

http://everycircuit.com/circuit/5340958291132416 this is also an option.

@hurz ...yes I know that my settings stop the converter. Let me repeat yet again.... My alterations were to stop EC from freezing so that Jason could work on his schematic ....I had no intention of doing any further at that point....I made that clear, and that was his original request. Any alterations thereafter would take considerable effort and calculation by the designer etc. It is not my design and if I were to make any start on such a project I personally would begin by considering the implications involved with putting any load on the source side of the Nmos... not an easy task, especially if the Id formula is not previously understood with regard to how that Id will respond under the changing Ohmic and saturation conditions (which are seen on @thebugger Mosfet gate bar here for instance). Even then if all went well, the next step would be to consider how a real Mosfet could be adjusted to comply with say an unrealistic Vth of 400mV etc .... all good fun, but no claims from me at being able to do it here.

So you stoped the buck converter loop by misstune the mosfet properties in a direction, were a buck converter can not work, cuz then jason can contiune on thinking about better/correct mosfet properties. And this is what you think is helpful...

I'd go with a P - channel mosfet, with the load connected to the drain.

Like this for instance - http://everycircuit.com/circuit/6269770336043008

Or a bjt version http://everycircuit.com/circuit/5509565956489216

@the bugger... I do not know enough on these buck converters, but it seems to me that the Pmos might be a better option like you suggest, unless one is well familiar with the implications of an Nmos Source load. The trouble with Hurz is that he prefers to lie and decieve in order to win an argument instead of seeing reason when he is confronted with areas of knowledge that he is not familiar with. It's nice to see your fair and advanced input on many matters in EC.

@2ctiby, right, the only unfair person and full of lies is you. Read this thread again. This kind of hate and foulmouth propaganda must stop.

Then lead the way @hurz. Start an EC revolution.

There is an EC entry here in recent days where @ViolationMad is asking a question about Mosfets in his response there. Now how about Hurz having a try at helping him there? Normally Hurz would respond with teasing useless questions which make himself look so knowledgeable, but really he is incapable of giving real help in that, because he does not understand Mosfets very well. No doubt we will not see Hurz responding to that entry now though. To make things worse ... he will see good replies in such cases, then come on with very pedantic comments pretending to be an even higher authority.... These are the sort of deceptions which he conducts all the time and he gets away with it because he has convinced many users that he is ultra knowledgeable in ALL areas of electronics. Here is that entry http://everycircuit.com/circuit/5417825052393472

This foulmouth propaganda must have an end! @2ctiby, what is you do not understand?

@2ctiby I have to agree with hurz, cause why wont one of you guys who asked hurz to ansewer, reply to my question?

@ViolationMad ... I had every intention of answering you ... I just wanted to give Hurz time to do that first so that we could all see how he knows so little in that area. Now if I answer you he will pretend that he knew all that and then pick stupid holes in my help so that he can look even better.... If you thought that I was remiss then how does that make Hurz right? ... Why not ask him directly for help here?

I gave you three solutions to your problem...

Ok, you dont stop, even you do not know anything, @2cent, your comments are more and more annoying. Your advice is not helpful, its irritating and wrong. If you would know how to compare mosfets you wont do this rubbish, but as usual you just messing around. http://everycircuit.com/circuit/5285501673406464

But the root cause why it stops simulating is not related to the MOSFET settings! There is much more to understand. But Mr 2cent just messes a little around and voila that easy. 2cent, recommand jason to remove the power supply to get rid of CFS. LOL.

@2cent, stop your foulmouth, and stop teach things yourself have no glue. W10um L1.01um Kp2mA Lambda0.06

Oh dear, no glue. A sticky situation!

I've heard that ass-a-tone dissolves that. ... see why most of the regular guys prefer to stay sub-dude rather than stand up to him.

Right, you see why nobody is listening to Mr Messy, cuz if you start things getting even worse.

@2ctiby, appreciate the humour. @hurts, don’t you see a pattern here? People get tired of your perpetual bullying and resort to humour.

Robbi, stop your bulling and stay at the facts

Sad clown

Stop this, or you will be reported.

Stop this or you will be reported.