How to Run a Simulation of Buck Converter - PCB Design

[@jamespatches4553]

I like this guys videos, he does a good job of explaining something I was interested in and then added even more value to it than I expected. Nice job.

[@RedRacconKing]

Excellent video as always, Zach! Keep 'em coming!

[@deangreenhough3479]

Excellent. Just what I needed thanks Zac

[@AltiumAcademy]

Glad it helped!

[@RnDmokkomotto]

how can i get this simulation circuit file to check in my altium designer

[@mostafanfs]

Very informative!

[@AltiumAcademy]

Glad it was helpful!

[@myetis1990]

Excellent as ever.cant wait to ses the next part. Hey Zach do you think to make an IC buck converter simulation? Because mostly we use ICs in olur design.

[@Zachariah-Peterson]

Yeah I do have that planned, I know that most people use ICs but I think these simulations are a good strategy for sizing inductors and capacitors to hit a ripple target.

[@myetis1990]

@@Zachariah-Petersonthank you for kind answer.I'm your fan because I've never asked so much questions to teacher at university and get the answers from the teacher as I do here .So thank you very much. mostly buck converters have feedback, we simulated here without feedback (it is mostly for output stability), so does it differ from real life so much?

[@vatsan2483]

@@myetis1990 Yeah the feedback is simply to sample the output and modulate switching according to the output response.. it basically serves the purpose of any feedback thats response stability and to ensure maintenance of target reference voltage avoiding subharmonics (that is why we have slope compensation) www.runonielsen.dk/Buck_with_subharm.pdf this reference among others sums the information pretty well :)

[@Zachariah-Peterson]

​@@vatsan2483 Yes that's right, and you can simulate that type of feedback action in SPICE, it's another aspect I should show in a video!

[@petersage5157]

The added resistance in the Pi filter reminds me of the Zobel filters used to stabilize amplifiers like the LM386 and TDA20x0 for longer cable runs. Similar causes and reasons?

[@vatsan2483]

Yes same reasoning for similar cause!!

[@Zachariah-Peterson]

I did not know the audio crowd called it a Zobel filter, but yes that is what I can see. From Zobel's paper it looks like the intent is matching damping to exactly a natural frequency, so the load is not experiencing critical damping. In the above it's less about achieving a specific matching condition and more important to ensure the power being output to the load does not experience excessive fluctuations, so that could require any level of damping that you need to determine in your circuit design.

[@petersage5157]

@@Zachariah-Peterson It's nice to know that there are things that the high-speed and audio folks can learn from each other. While I don't doubt your research, the application you describe above is typically called a Boucherot cell; the audio crowd tends to use "Zobel network" more generically for "that output RC snubber in the datasheet of practically every chip power amp." ;)

[@Zachariah-Peterson]

@@petersage5157 You learn something new every day!

[@RnDmokkomotto]

please share this simulation file

[@asadullahjan3610]

hi. how to design or create a CMC choke in Altium Designer. whereas later I'd able to run the simulation. Thank you

[@Zachariah-Peterson]

The closest you can get in Altium Designer with the built-in libraries is to use the Coupled Inductors component in the Simulation Generic Components library. You could take this and modify the SPICE code or import new SPICE code into this part and that would give you a CMC. You might also find a CMC part for simulation from a vendor, such as from Wurth.

[@bahramkhan4762]

How can I design Buck converter on PCB of 500 watts , Inputs voltage 30v and output voltage 24v. Kindly help me if anyone know

[@Zachariah-Peterson]

At that power level you will probably want a flyback converter. In the past I've done this as an LLC resonant converter but it can also be done as a flyback converter. There are reference designs for both that you can generate with WEBENCH.

[@StoyanBorov]

That simulation doesn't seem to be superior than LTSpice from 25 years ago. Altium's schematic editor looks like fom 80's, When I was 16 I made much better schematic editor using 286 and QBasic.

[@markworkman6544]

reinventing the wheel.....IMO