I have been designing power mosfet stuff for decades, having to take into consideration all the parasitics, and I have NEVER see such a clean explanation as yours, good stuff! I think teachers and professors should take note!
i have to back to books again.... never take that much importance to parasitic componentes !! It's good to listen to people who know, talk about deep topics.
At 18:25 "...and this is thousands of volts, actually quite dangerous not only to people, but more importantly to circuitry..." LOL! Thanks for the video!
If there is one takeaway from this (as a digital guy) is I need to find a MOSFET expert to design a circuit/PCB for me. I am beginning to realise why things have not been working. What an excellent video. You could do a whole degree in MOSFETs alone.
It kind of works like that if you try to use IC's as much as possible for 'function blocks', most IC's use cmos. And if you want to use a mosfet to switch something use a mosfet-driver IC and use the recommended circuits in the datasheets of the IC's, then you can kinda just treat it as if it's all digital.
The connection between 2-port circuits and the analysis of 3-lead devices like MOSFETs and BJTs is crucial for understanding how these components function in more complex circuits. By considering a MOSFET as a 2-port network, you can better grasp how the various parameters interact, even though MOSFETs introduce non-linearity into the equation. The emphasis on Appendix C and the importance of mastering 2-port network theory as a foundation is a key takeaway, as it provides the theoretical basis to transition from analyzing simpler 2-lead devices to more complex 3-lead components.
Threshold means the beam under the door, which prevents water from running into the apartment. In electronics, threshold means a value that must be exceeded for an action to be successful. Threshold means to hold back.
This video is so INSANELY USEFULL!!!! So many videos about MOSFETs explain it as simply a switch, completely glossing over all the little behaviors and secondary components and requirements that go into properly using one. Which if you're going to be making an actual real practical circuit with one... you cant just ignore. This channel actually explaines things with a level of detail and conciseness thats hard to find anywhere else!
That was truly amazing! I'm just learning about electronics and whilst I knew what MOSFETS are and what they do I now feel as if I now know them far better, if not, dare I say it, intimately. I have to confess it all got a little intimidating since there is evidently so much to learn about these critters, but your presentation kept to the point and dismissed the surrounding unnecessary ephemera to deliver pragmatic solutions. I think my only complaint is that you don't do as many of these vid's as I would like, (chuckle), though I have to confess I'm more than content to take whatever you can throw at us. I often feel overwhelmed by the beneficence of folks like yourself who donate so much time in order to give the rest of us so much information and I thank you for that. I know this is becoming an often over used phrase but, this is what the interweb thingy should be about, best quality info dissemination and you get the highest BQID quotient of 10, on a logarithmic scale of course!!!! Take it easy youth, keep doin' what it is you do, best regards Matt.
Thanks Matt that really means a lot! I wish I had more free time to make videos, but for the foreseeable future 1-2 a month is probably going to be my limit. Fear not, however, as I have some exciting plans!
As an American who watches a lot of BBC documentaries, I have to say you have that “British narrator voice” down cold. Like David Attenborough. Attenborough could make a compelling narrative out of an elephant scratching his ass on a tree. You just did the same for MOSFETS.
@@electrarc240 If I watched your video 40 years ago when mosfets were in their early days, and had way worse parasitics, this video would have saved me a lot of frustration.
Finally someone explains MOSFET in a way that I can relate to and understand, and hence highly appreciate. I had a rough idea at first how it works, but now I think I know enough to be dangerous 😈😅
I appreciate how you broke down the key differences between MOSFETs and BJTs. The explanation of MOSFETs acting more like capacitors between their terminals, particularly the gate-source capacitance (Cgs), was spot on. It's crucial to understand that while MOSFETs have very low static current at the gate-source junction, the current can increase significantly with a high-frequency signal due to the drop in impedance. This is a vital consideration when designing circuits with dynamic signals on the gate. Also, your comparison of MOSFETs as voltage-controlled current sources (VCCS) versus BJTs as current-controlled current sources (CCCS) helps clarify their different operating principles.
It feels like all the hard lessons, I've had to learn about mosfet, and how they work, and the things people failed to tell me, all those years ago, have been condensed into one video. Mabe other people won't need 30 years of learning by trial and error. I love the simple analogies. I often make a "MOS-diode" because it drops less voltage. You simply connect the gate and source together. I also appreciate to time and effort it takes to edit these videos🤔😉. If you only ever watch a youtube video, you will never never know the pain it takes to make one. Thank you 👍
You explain mosfets so thoroughly that I can comprehend exactly what is happening and why... You are going to change the world if you keep teaching this effectively.. GOOD JOB ElectrArc240. Keep on keeping on.. Thank you so much.
On body diodes: "every MOSFET has one, and it's nothing to be ashamed of" That unlocked a deeply repressed memory from primary school - I have no idea what was being taught at the time.
Yeah, in my early days I utterly hated the body diode, but now, not a big deal. Some will say it is useful in some circuits, but that is VERY RARE because the internal body diode is crappy compared to an external Schottky.
I once made a crude speed controller for an rc car out of a servo board driving a stack of parallel mosfets to handle the current draw of the motor. This video had so much depth!
I am going to have to watch this a few more times to soak it up, great work! My mind gets pissed off at the fact they names it a gate and I always think ground when I see the G. Lol
it must be great to be an EE with all this awesome new stuff coming out. i would wanna throw together an inverter with those nexperias instantly. what amazing stuff
I, for one, think that the use of real physical pcb’s and real physical component examples are an excellent way to demonstrate what was being explained here, as opposed to an animation. More real, being connected to real power from very real power supplies. This video contains very important and useful information. Information that I came to realize the importance of a few years back when I decided to design and build my own FET switched spot-welder for building battery packs because I, being the idealist that I sometimes am, was not satisfied with the two extremes regarding price and quality of pcb-based spot welder offerings that seemed to be the only choice at the time. I liked the price of the $20-$30 pcb’s from ebay, but I was not a fan of design flaws that they seemingly all copied from a few initial designs. Flaws which caused the smoke to be let out within a very short use life. Fun fact, if you learn everything contained in thus video about power mosfets, you have all the information you need to build an effective and functional mosfet-based spot welder. Some of the losses covered in this video become very apparent when switching several hundred amps of current, even if it is just on and then off as a solid-state switch. The linear region. Switching the gate capacitance miller-plateau as quickly as possible. Gate resistance. Gate-source voltage. Voltage spikes from flyback inductance. These were all extremely important factors to consider in designing a fet-based spot welder. Another thing: If you learned everything shown in this video, you now have all the knowledge needed to make a few simple modifications to those $20 spot weld pcb’s to make them as reliable as a $300-$400 pcb-based spot welder, and to modify them to handle 3x their rated current spec for welding copper strip, even, instead of the somewhat convenient yet not-so-conductive nickel strip.
Another great video! I'am the commenter in the previous SMPS video of yours. I ended up just connect the negative to the earth/ground lead. Our house actually don't have earth connection on the outlets. The earthing is just 1.5 meters of rebar into the soil, and I guess it works since my power amplifier is not hissing anymore. Oh, the power supply is Meanwell LRS-350
Like OTHERS in this comment section, I already had a 'better than average' understanding (i.e. Not perfect, but not abysmal either) of all the basics. This video was STILL brilliant despite my (limited?) prior knowledge on the subject... Well done sir!
11:38 Saturation is real. I just spent some time playing with a power MOSFET and a 12 volt turn signal light bulb. With 12 volts source to drain voltage and 12 volts on the gate, the device stays so cool that it does not need a heat sink. The light is getting 2 amps of current and 24 watts of power, but even after several minutes the transistor does not get hot. When I reduce the gate voltage to 4.5 volts to dim the bulb (about 1 amp of current), the transistor heats up quickly. Just one minute in saturation gets the heat sink so hot that I can barely touch it. Thank you for the video!
You young (to me) man are a great teacher, found your channel by chance, now subscribing who wouldn't interested in electronics. Looking forward to watching your other videos.
You were obviously very well-prepared, and your explanations were very clear and well-structured. I knew most of this, but it is refreshing to hear someone who knows how to put the cookies on the bottom shelf. As Richard Feynman says, if you can't explain it to a fifth-grader, you don't know the material well enough (not an exact quote...). I expect you also learned a bit about the devices when preparing this presentation. Well Done.
I'm an electronics engineer that defected to software camp... That was a very clear and engaging presentation. Loved it! The pace, the voice, the material and delivery! Thanks!
Good afternoon, engineer, I love your videos, they are really very illustrative and very good tools that you use. I congratulate you from Mexicali, Baja California, Mexico, 🎩🇬🇧🇲🇽
@@electrarc240 It was clear reason to me . That changes nothing to the content , whih is perfect . Most important thing is the way , how smoothly You sharing Your knowledge . I'm an ear , than eye . Sound engineer and electronic technician with above 30 years of practice . First thing , when Im servicing elecronics is visual and + often I make some photos . Regards from Poland !
2:56 Very important distinction: simply "taking away" the voltage does not turn a MOSFET off; the gate needs to be *forced* inactive. A relay has a spring to turn it off, but a MOSFET has no equivalent.
I specifically used the phrase "take away" to imply that, but as I hadn't yet introduced the concept of input capacitance I didn't want to say any more than that at that stage
I've taught this sort of stuff and like your approach - if I hadn't retired I'd be using it in some way. Really good that you're overlaying your relay with the schematic however it took me a while to understand your purple wires. Initially I thought they both came from your lamp and you were connecting it in parallel with the relay. It would have been clearer if at 2:44 (and later) your 2nd PSU negative was a black wire and a red wire was visible connected to the high side of the lamp. I particularly loved your tap analogy for the saturation current and you answered questions about parasitics I've long been unable to find answers to!
Nice explanation! Visual content significantly increase understanding. Thanks! Cheers from Ukraine. I have master's degree in radiophysics and electronics.
Excellent video! Finally some clear explanations that a noob like me can use to understand how some MCU's and MOSFETS got damaged in the experiments. Thank you for sharing!
I can remember making circuits to light bulbs, I never really grasped electronics but I did take on board Computing with a ZX 81 then onwards. My friend got a Commodore and we used to sit hours, transferring programmes from magazines to the computer. Same thing happened with this, I had mental blockage to understand words I never came across at School. Then, Motorcycles came into my life, there were times when working on them that you used to have to fault find electrics, again it was a real headache trying to trace through wiring, what and where things were failing. The moral of this story is, sometimes you have to learn your limits, mine was circuits making bulbs turn on and off lol.
I watched your video. I heard you say words that, by themselves, I understood, but in the combination you used, was all gibberish. I wish I could understand just a fraction of the information you provided, but alas, the brain is full. I don't even know what MOSFETS are used for. I'm sure someone got something out of this video, it was very well produced and I'm sure someone understood your explanations. Congrats.
Such an awesome and better way of explaining some of these concepts than all the other videos i've been watching recently on MOSFETs! One thing which wasn't covered is "avalanche, or at least i dont think it was covered but i'm still learning all this so maybe it was but goes by another term or only applies for P-channel or something? Would be very interested in a video in this style covering perhaps some practical examples or demonstrations of the "gotchyas" or problematic things touched on here.. for example at 20:50 you mention ringing which i'm aware of and think i understand correctly but perhaps would understand even better with this style of explaining/demonstrating. Anyhoo, really enjoyed it and hope to see more videos from you like this!! It's compatible with the way my brain works and learn things 😆
4:40 not all MOSFETs have a body diode, at least not as shown here. It's an effect of connecting the body terminal to the source or drain, which is what happens in 3-terminal MOSFETs, but you can get MOSFETs where all four terminals are available separately.
For the moment, I saw 3-4 of your vidéos, they were "what is XXX and how that work" (an expemple), and that remind an old series french that I watch a long times ago named "c'est pas sorcier". So thx for this vidéos.
Waiting for you to make videos on impedance matching . To this day i didnt fully understand what it does , why does this concept even exist , but i'm sure with your teaching skills i'll be able to fully understand it
This tutorial is so chock full of information that I'm going to have to save it to a playlist. BJT's are much easier to understand but I want to use mosfets and triacs to drive power electronics.
Yeah I started on BJTs but they are so outdated now it's harder and harder to justify not switching to FETs. Though I bet this video has given quite a few excuses haha
@@electrarc240 Thanks for replying! I hope you consider doing a tutorial on charge pumps. It would be nice to have the knowledge to build n-channel bldc motor drivers. Just a thought but thanks so much for sharing your expertise.
@@awaitingthetrumpetcall4529 Yeah charge pumps are an interesting thing I'll probably cover a bit in an upcoming video where I've designed a 50W DCDC converter for some demos. If your budget can stretch isolated DCDCs for each high-side FET (ideally all six) is a much simpler way to do things. That's what I'm used to cause charge pumps aren't really a thing on 800V+ SiC inverters lol. One of these funny cases where things are most complex on low-cost low-end products and get simpler at the high-end. Also a bit of a bulky solution for a small BLDC driver if size is of concern to you
@@awaitingthetrumpetcall4529 Check out my video on my three-phase inverter to see an example of that. Maybe don't copy anything else from that though 😬😅. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BHaP36z9Rk0.htmlsi=7KlJPS_ZUdWr8OD_
