OP already has 2 or 3 threads going on this same subject.

 

Post the pdf/image file of schematic and not zip or exe files.

 

You have threads started here
http://forum.allaboutcircuits.com/threads/help-in-boost-converter.103924/

and here

http://forum.allaboutcircuits.com/threads/circuit-help.103867/#post-786222

How many threads do you need on the same subject? One is enough. Thank you.,

Sorry for the confusion. I am new to this forum.

 

OP already has 2 or 3 threads going on this same subject.

Sorry for the confusion. I am just new to this forum.

 

Sorry for the confusion. I am just new to this forum.

One topic, one thread. This site has enough active and helpful members to insure you get an answer if you have a well described problem and reasonable background info.

If you try to start multiples (considered to be rude), you will likely irritate people and you will get rude answers. It is rude because people try to help on one thread and then they realize the same answer was already supplied on another version of a similar thread. People don't like to waste time or confuse issues.

We do understand you are new. Welcome to the forum. We will get you through this rough start. Hang in there.

Ask the moderators to consolidate your threads

 

Done, not my neatest work.

 

I couldn't find a data sheet for your FET, so I didn't try to install it.
But I suspect it has to much on resistance to get 45 amps out.
I used a regular low Rds on transistor and it seems to work.

 

I suspect your model is bad. Where did you get it? If it is some kind of thermal model it may go goofy as the current in the FET is way over it's spec.

 

Excuse me. The reason to focus on power in a DC-DC converter is to answer your question about why you could not maintain the output voltage. The reason is likely to involve asking for more power from the source supply than it can provide, or saturation of the inductor, or operation of the switch in the linear region. These are very common mistakes among designers who try to design DC-DC converters without understanding the power-out/power-in relationsips and their implications. So before you throw stones at my questions you should be sure you're on firmer ground.

 

It's a simulation, not a real circuit, so there is no limit on the supply, no saturation spec'd for the inductor. Now the FET - that's the question.

 

It's a simulation, not a real circuit, so there is no limit on the supply, no saturation spec'd for the inductor. Now the FET - that's the question.

We know that now, but not from the original post. I didn't open the .zip file for the usual reasons.