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Excuse me, may i ask what the dot stands phisically for a coupled inductors ? I mean, given a real "transformer", how can i identify the right connections ? Furthermore, i think there's something not clear about deriving [EQ6] from [EQ4] = [EQ5] in your main comment, are they correct ?

thank you sir

@robertbolanos Thank you for your videos. These videos are gems for people working on flyback designing. My RCD snubber is reducing the voltage spike but not eliminating the ringing. Is there any specific reason for this? Once again thank you for your videos

Thank you Sir.

Dear Robert, i have request for the excel formula design. Do your received my email? thanks

thank you so so much :)

Any reference on the math behind these parameters that are used in the spice model?

Nice and more interesting video.

Hi Robert, Looks good . Can I get the excel sheet ?

Very informative video

Robert! I’m MARINA! I’m living in Raleigh in NC. Are you in Texas?

Hi, but when I also add the term (1+λVds) to the current equation and have fixed the current Id, Vt and Kp, how can I understand the values of Vgs and Vds? For example, in the current mirror I want polarization with a fixed Id current, how can I also fix the Vds in such a way as to obtain the fixed Vgs? Could you point me to a guide that explains how to make a MOSFET work as an ideal current generator to impart a reference current into a current mirror? thank you so much

Is there somewhere I can download the document used in the presentation?

Excelenet!!!

Thanks for this great series on Flyback converter design. I have all my interns review and study your material. Your instruction and techniques reflect your years of practical experience and excellence. Thanks for passing this knowledge down to future generations.

Hi Robert, Thank you for this video. Question, in the title you mention that this is a transformer and so I am assuming that this is a ferrite material with no air gap. However, in your video you mention that this is an inductor. Is this an inductor with an air gap or a transformer?

Excelente video!!! A question I have tried to follow the Rdc equation (15:17 and 23:42) and I can see that there is a factor in the multiplication = *2.4, why? This value does not correspond to the one in the excel sheet provided by you... is it an adjustment factor? thank you very much for your reply.

What is the power dissipation on the MOSFET?

Many thanks, this is a veri good!!! Hello is possible send me the material Excel!. Thanks

thaks for your videos!!!

👋

Hello Robert, The Excel spreadsheet can be put here ?

Thank you so much for the great video, but how did you get the value for Vd'? Why it is 0.48V?

Thank you for your great presentation. But i have any questions. What about resonant frequency of converter, in this point our converter has lower impedance, and yes Middlebrook Criteria need to be satisfied in all frequency domain less that our Fsw. Can you explain, because your Impedance calculation don't reflect this, and cutoff frequency off your filter is designed only using needed attenuation and don't exclude intersection between peak of filter impedance and lower impedance of converter at resonant frequency, and if i understand correctly, this model of converter don't use variable negative resistance like real converter is. Thanks you very much and please correct me if i misunderstood something!

Dear Sir, Could you show how to do this type of simulation on LTSpice? Cordially,

Greetings and Super excellent videos. Could you send a link with the PDF of Wuth's book? I try that design kit with typical materials. My idea is to build a kit with materials per part since this kit is not sold... It is possible to take a photo or focus on it... thank you very much for your excellent videos.

Dear Sir, I am carefully studying your videos but unfortunately the TopSpice DEMO does not have a model for the 4N25. Is there any alternative? This simulation is much more complicated in LTSpice?

Hello Robert, I'm trying to duplicate your results using LTSpice and i'm only coming up with a max current from the FFT at 100Khz as ~456mA not 645mA. Could you point out the initial similation that gave you those results?

thank you Robert

Love your spelling of PI. (PIE - hehe)

I had taken a whole year of Flyback design courses at the university. And you sir, undoubtly a better teacher than my tutors! Thank you a lot!

That's a very useful comparison. Did you set all of the SPICE options to the same values on both simulators?

i have a problem i measure lk = 70 uH and lp = 175 uH so K = 0.77 is this very bad?

Great video sir, thanks. Learn a lot.

Hi Robert greetings from Spain Would be nice to have compensation example with transconductance amplifier model, since is widely used on many regulator chips :)

Thank you for your great presentation. Could you tell me please how did you select the value of the negative resistance?

The RC damp is ur snubber?

How is the secondary voltage 12V in the Nr = 0.1 case - surely the secondary voltage in only 2.4V in that case? This then gives the same Vds of 2* Vin = 48V...

thank you Robert for your excellent explanation 👍🏻

If you like this video and find it usefull, please subscribe and give a thumbs up. It will help my channel.

Excellent

Are the equations regarding mosfet conduction and switching losses in Sanjaya's book reliable?

Saludos desde Madrid Robert

Great video sir