Designing Power MOSFET Circuits - Circuit Tips and Tricks

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Designing Power MOSFET Circuits - Circuit Tips and Tricks
MOSFET circuit design and selection is a commonly requested topic for me to cover. There are a lot of uses for MOSFETs, as a result, they have become more commonplace than standard BJT or NPN transistors, especially in high-power applications. I will cover information and equations needed to design useful circuits without getting "down in the weeds" with complicated derivations
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КОМЕНТАРІ: 519

@Graham_Wideman 3 роки тому

Problem! It's great that you're making videos like this, but I think the power calculation is a bit off. if you're going to deliberately slow the on-off and off-on transitions, then those transition times are durations when the MOSFET will have to conduct significant current while exhibiting significant resistance. This can easily dominate the heat output.

@MicroTypeEngineering 3 роки тому

Yes, you're right. I had to limit what went in the video, and was focusing mainly on high-power low switching speeds drives. But yes, I wish I would have at least mentioned the losses during switching.

@Graham_Wideman 3 роки тому

@@MicroTypeEngineering Thanks for replying. I'll just add that I think what happens during turn-on/turn-off is especially crucial to mention, because an unaware designer could be lulled into over-optimism by the astoundingly low on resistance that some of these devices have. That low resistance does indeed mean that your sample device can carry very high current, especially given suitable heatsink. But factor in frequent switching, and the numbers blow up, perhaps surprisingly for some.

@JGott0001 3 роки тому

I'm glad you two brought this up. Thank you for the video, MTE!

@dwalden74 3 роки тому

So should we reduce the gate resistance to speed up the on-off transitions?

@Graham_Wideman 3 роки тому

@@dwalden74 Right, you would reduce the gate resistance according to the calculations that MTE did in the last 5 minutes of the video. That's assuming the gate driver chip can handle the current pulse and isn't the limiting factor. But first, you would first want to assess how much heat is dissipated during those transitions to see how fast you need the transitions to be. If you are switching infrequently, then slow transitions are not much of a concern. But if you're switching frequently, then they can easily dominate the heat output. To assess the heat output per transition, conceptually you would need the gate waveform (VGS vs t), then the corresponding RDS (drain-source resistance) vs VGS, so you arrive at an RDS vs t. That's pretty tedious, so instead model it in Spice (for example). The Spice sim can directly plot the power dissipated per transition (just VDS x IDS). And run a range of parameter values, as VGS vs RDS is not a tightly controlled parameter.

@Roody Рік тому

Just the first 5 minutes, and I can totally say THIS is the way to explain things. Clear, simple, direct, practical examples. I've seen tons of videos about the same topic, and none of them were useful at all. Man, you deserve credit. Thank you for the vid.

@wouldntyouliketoknow9891 2 роки тому

"Theres not a whole lot of in between" - I have observed this on many topics. It is the curse of the internet. So much information, so little relevant information.

@og.StudMuffin 18 днів тому

Wow.. you make things so much easier to understand. You dont assume we know anything at all and its great. Everything you say if it isnt obvious, you breifly explain what you meant in laymans terms. Thank you!

@Blandified 3 роки тому

This is incredible, thanks so much! I especially love how you explain WHY you do certain things. A lot of videos say "oh just do this, put this resistor here" then they move on. But you explain WHY certain things go there. I love it cause it helps me learn!

@MicroTypeEngineering 3 роки тому

Glad it was helpful!

@jonathanm9436 3 роки тому

Agreed - the "why" is so often missing. This has been a marvellous video.

@KholyScript 3 роки тому

I've never seen a video that holds all the information needed in less than half an hour! Right into the point like an arrow! Well done.

@MicroTypeEngineering 3 роки тому

Thanks, glad you enjoyed!

@houtmann774 Місяць тому

A concise, to the point explanation in a language the 'mortal' being can understand without the 'gobbledygook' and 'dreaded' calculus. Great stuff, keep it up!

@damny0utoobe 3 роки тому

Perfectly practical introduction into using a mosfet with MCUs.

@MicroTypeEngineering 3 роки тому

Glad you liked it!

@jedfrank9597 2 роки тому

Thank you for teaching that so well. This is the first bit of info I've come across that actually helps me make an informed decision on which mosfet to get. Thank you for taking the time to make this video.

@bimmerboard 3 роки тому

I have a degree in EE, but I never had such a clear explanation from any of my professors back in school. Well done!

@tonyonofrio1147 3 роки тому

@@jamescollier3 The circuit in this video is using the mosfet at it's most simplest function, as switch. So normally you would wire your "load" (led, motor, etc) in series with the switch (mosfet). Mosfets are popular as switches since they dissipate very little power compared to transistor switches. The video you linked to is using the mosfet as an (analogue) amplifier. Without going into the many different amplifier configurations (some which have the speaker in series with the mosfet) the results, conditions, and calculations are different.

@wills3212 3 роки тому

Perhaps the best instructional video for mosfets really clear thank you

@barry7608 3 роки тому

Extremely well explained thanks, I still have a long way to go but with tutorials like this half the battle is won

@BusyElectrons 4 роки тому

Excellent overview! Thank you for doing this.

@cs_fl5048 3 роки тому

I know virtually nothing about any of this, but I watch a lot of tear down channels as I find it very interesting. This video made so many things that those gloss over so clear... such as why there are little circuits with resisters going around the "real" circuits, etc. THANKS!

@iot_enthusiast 3 роки тому

Thoroughly enjoyed the crystal clear explanation!

@Ammothief41 3 роки тому

Awesome. Wish I had watched this a few years ago, I'm sure it'll be useful to anyone getting into electronics.

@Jonmal0ne 3 роки тому

Clear, concise, pragmatic. Love it mate. I learned a lot thanks to you. :)

@richardandrews573 Рік тому

So I needed to refresh myself with a single concise tut on MOSFET's and I found it. Bravo.

@warrenmondon3375 9 місяців тому

WOW. Great job...I learnt without frowning and scrunching up my face. The information just went straight in. I will be watching ALL of your videos. Thank you.

@truthorhappiness 3 роки тому

This has been the most helpful video on MOSFET's I've seen yet. Thank you!

@MicroTypeEngineering 3 роки тому

Wow, thanks!

@MadScientist267 3 роки тому

I completely agree. Too many videos rely on music, obnoxious antics, weird visual effects, and the like. A simple factual presentation that covers the crucial aspects with explanations is an increasingly rare thing, and definitely appreciated.

@Taylor_5724 3 роки тому

Yeah I agree this was extremely helpful

@sampathsubasinghe929 7 місяців тому

Great explanation on driving MOSFETs. Thanks !

@bryanst.martin7134 3 роки тому

I've been doin this a while, but sir, this was clearly and concisely explained. Kudos. Subbed.

@stanspb763 3 роки тому

This showed up in recommended channels....how did it know I was working on a large smps for a power amp with blown MOSFETS at that moment. It was a design I did and surely the UKposts masterminds were trying to tell me something. Very well explained and the production values of your videos are welcome indeed. Thank you. Why only 6k subs? It is 6k +1 now.

@loadingUserID... 3 роки тому

Very well explained. You keep it practical. Nice job!

@hollymedici2936 Рік тому

you are the only one that had actual values for the resistors big help thank you

@SuperCookieGaming_ Рік тому

this is a wonderful explanation! the simple videos you mentioned make it seem so easy to drive but the other videos make it so complicated. you managed to find whats important and relayed that info in a clear and concise way. I am designing a 9v battery to usb charger and i wanted to add undervolting protection. i found a very low power comparator that has an internal reference that makes it easy. the problem is my buck converter doesn’t have an enable pin. so i have to use something to turn the circuit on and off. i didn’t want to waste power driving a bjt but mosfets seem so complicated. now i understand what to do.

@LOGICOMA 3 роки тому

I've watched this multiple times, and it has helped so much! They explain components and pcb design tips really well! Thanks so much!

@MicroTypeEngineering 3 роки тому

You're very welcome!

@marv4895 2 роки тому

i would love to see more educational and practical videos like this from you

@virajytube 4 роки тому

This video is enough for every MOSFET designer. I appreciate for your efforts. Please, make a video on intricate-accurate MOSFET calculations.

@scottneels2628 Місяць тому

Thanks for this, it's exactly the level of detail I needed, and from your explanation I can appreciate when and why there are cases where far more detailed selection/calculations would be required. i suspect that for my purposes I'll probably never need more than these basic selection considerations and quick safe limit proximity checks.

@simonndungu1196 4 роки тому

I am a huge fan of your design tips

@mth32871 2 роки тому

Now that was an excellent explanation! This is probably one of the clearest and and most thoroughly explained videos about any electronics topics that I have ever seen (and there are quite a few great ones out there). Very well done. Thank you!

@MicroTypeEngineering 2 роки тому

Wow, thanks!

@ihtsarl9115 2 роки тому

Thank you for this tutorial on Mosfets. Posting a further video on IGBTs would be helpful especially because according to my experience IGBTs are more difficult to work with.

@willbill808 2 роки тому

I never thought about that gate inrush current before! And here I was with just a 10K pull down for my Arduino.

@deltabravo2810 3 роки тому

Thanks for the explanation, Now I understand working principal, the design parameters and calculations.

@the-beneficiary1809 Рік тому

I really appreciate you taking the time to thoroughly explain Mosfets and how they work in conjuction with the MOSFET Drivers. As a controls engineer I can say this was very well explained and simple to undertsand. Trying to research everything i need so I can design a BLDC controller for a special project I have jumped into to keep my self busy. Thanks Brother.

@spawnofdawnacle 3 роки тому

this is a fine presentation. i feel lucky to have found your channel. thanks.

@dianbasit9624 Рік тому

Excellent explanation and especially you give the reason for using the resistors in gate of mos transistors. Thanks for great and concise explanation.

@samk2630 3 роки тому

The video I’ve been hunting for too long. Thank you, earned a sub!

@pcbworks Рік тому

I love the way you speak and explain things. Thank you

@Frank_McIsaac 10 місяців тому

Great video! Your explanation was so clear. Nice work!

@georgemarkuly8180 2 роки тому

Excellent pragmatic presentation. Especially important discussion of gate resistors seldom addressed by many videos.

@tewodrosgirma3019 2 роки тому

I am glad I watch this video, it's amazing. For a complete explanation about the power losses, it would be better to include the switching losses. Thank you very much for such outstanding explanations.

@shvideo1 3 роки тому

Very useful video on MOSFET. Thank you for covering the datasheet parameters and their meaning. Thoroughly enjoyed it. Thank you.

@MicroTypeEngineering 3 роки тому

Glad it was helpful!

@killer2point057 4 місяці тому

Great explanation. Thank you for your time.

@iblesbosuok 3 роки тому

Hats off for well structured and crystal clear explanation.

@midronome Рік тому

Nice content, thank you! Love the format, simple and calm explanation - that really changes from those crazy super-fast videos out there on UKposts ;) Cheers Simon

@nigelmurraysmith5498 3 місяці тому

Clear and refreshing pertinent rational thinking process

@lukasstieglitz2941 2 роки тому

very well explained. thank you!

@MethodMan- 8 місяців тому

This was really helpful, thank you very much!

@eugenenault4935 Рік тому

Most in-depth mosfet circuit explanation on UKposts . Great job. Thanks

@MicroTypeEngineering Рік тому

You are welcome!

@a1nelson 4 роки тому

Easily, by far, the best guide to real-world use of MOSFETs on UKposts. Not a home run - a grand slam. It absolutely accomplished the goals stated at the start: genuinely useful, while steering clear of the weeds that others let their viewers/students get lost in. Definitely sets the new high-water mark for the MTE channel. Looking forward to whatever comes next! Thanks much.

@MicroTypeEngineering 4 роки тому

Wow, I appreciate the comment :) Yeah, I don't know how I can follow this one up haha!

@ihtsarl9115 2 роки тому

Thanks for this Tutorial I am grateful for taking your precious time to make this video.

@KF-bj3ce 3 роки тому

Great explanation specially the parts where you refer to the tech data sheets.

@danlscan Рік тому

Thanks! Just the right amount of detail.

@zonnig46 3 роки тому

I learned so much about the mosfet. Thanks a lot for this video. Gtz from Amsterdam, The Netherlands.

@WayneMcNab 2 роки тому

Excellent. You commented on increasing the gate resistor. The thing to watch is that by doing this, you increase the charge time and the amount of time the divine is in linear mode. During this time it is dissipating much more power. If the gate resistor is too high, it will increase the delta T.

@karlOFuchs 2 роки тому

This was awesome. Thank you for creating this video.

@afonsomanuel1585 6 місяців тому

This man is gold, great work.

@Brian-mf3ry 2 роки тому

This is literally what I needed. Thank you!

@user-pe3pn4lk7h 9 місяців тому

Thanks for the awesome video! This is exactly the kind of content there is too little of as you mentioned at the beginning!

@dancoz5477 9 місяців тому

Bravo monsieur. Keep the good work going. Your prononciation is clear and sufficiently slow so people like me (?) can understand and follow you. I taught at the university level in Canada and I would of liked to have your ease and pedagogic talent of communication during those years.

@ScienceShack 7 місяців тому

Wow - this is fantastic. So well presented and really useful even for those of us who have been using mosfets for years. New sub for sure :)

@venkir1408 Рік тому

Thank you so much for such a great explanation, I never had this clear idea before. really useful. 💯

@eugen995 3 роки тому

Very beautiful explanation sustained by a clear and slow speed language! Thank you!

@MicroTypeEngineering 3 роки тому

Glad you liked it

@SimplySpace 2 роки тому

Instant subscribe. Huge help, thank you!

@mitz8892 4 роки тому

Great explanation !! Thanks a lot.

@snehamoypatra9786 2 роки тому

Your contribution to this field is really unmatched.

@MicroTypeEngineering 2 роки тому

I appreciate the words 😊

@marklowe7431 2 роки тому

Super well explained. Thanks.

@Cutycats9 3 роки тому

Thanks a lot friend keep up we are with you forever

@69MazdaR100 3 роки тому

Great video with excellent explanation. Learnt more from this video than the 20 previous ones combined, subscribed!

@MicroTypeEngineering 3 роки тому

Awesome, thank you!

@joshbarnard3003 Рік тому

Thank you for making this video and explaining things how you do. I was having a problem with ringing in the circuit and I was thinking i was going to have to add a RCD clamp and snubber circuit, but adding a resistor to the gate solved the whole issue! I was kind of confused why it was ringing since my load is basically resistive. Anyway, thanks again!

@minazulkhan8287 2 роки тому

I m working as electronic engineer . This video was very informative .Thanks .Expects more videos

@CCDobrescu 3 роки тому

Wow excellent explanation! Great job!

@bowesterlund3719 3 роки тому

Super happy I found this channel! Will binge every vid soon I think

@MicroTypeEngineering 3 роки тому

Welcome aboard! Enjoy :)

@user-dx8fv9ji6b Місяць тому

This is an absolutely superb presentation. This mechanical engineer is now in with a fighting chance of building a simple dc switch which demands effectively zero gate current once energised. Thank you for improving my education with no pain.

@sivaapss0015 3 роки тому

Finally and finally i got what I searched for a very Long time

@Estudio322 3 роки тому

Im so thankfull to have found your channel

@michaelhawthorne8696 4 місяці тому

Nice bit of theory Liked and subbed ! 👌

@jatag100 2 роки тому

Great video, thorough and clear! Thanks!!

@10e999 4 роки тому

As always; excellent.

@gkdresden 4 місяці тому

This is really a handy way to do rough calculations around a power MOSFET. I personally calculate with half of the gate current to get more realistic switching times. Under more critical timing conditions I also consider the internal gate resistance, which is typically in the order of 1 to 10 Ohm. So in some cases you don't need an additional gate resistor or you have to avoid it to fulfill your switching requirements.

@k9kj Рік тому

This video was amazing! Just what i was looking for

@stuchump 2 роки тому

wonderfully explained. you should have more subs

@ramirosuarez9537 Рік тому

Amazing! Many thanks.

@jessea2489 3 роки тому

great stuff! been learning how to repair electronics mainly car amps. I have mastered the art of blowing them up so i figured it is time to learn how to fix'um and sense it's just for fun, i am getting my degree here on UKposts. so i gotta say i have watched a bunch of electronics videos most of witch if i didn't know better i would of sworn they where in a different langue then English. but i also would have to say most of this video, if not all of i understood an learned a bunch. i appreciate you sharing your knowledge an more importantly, to me anyways. in a way you don't have to be a electrical engineer to understand so thanks an cant wait for another.

@tarunarya1780 11 місяців тому

I have watched lots of videos on mosfets and yours is the most succinct and easily understandable with just about everything you need on one page that you can see during the explanation. You crystalized quite a few things for me. The only thing that was not mentioned was about use of zener diodes to pull up voltages but you may cover these in another video, and possible use of a transistor to be triggered to charge up the gate capacitor.. The gate driver IC I guess is most useful for driving higher frequency as it allows higher currents for charging it. I was not sure why the gate driver is better than use of these. Is it because it simplifies the pcb layout, as you still need other components? I was trying to get to grips with them for making an h bridges for an initially rc controlled (pre automated) lawnmower with brushless motor 40v/(?100a from an existing possibly failed esc) and dc brushed wheelchair motors.24v 250-340w. Your video will helped look to do this rather than buying expensive driver escs such as the sabretooth 2x60 as well as make a lawnmower esc to fix the lawnmower which uses 60v 100a mosfets inside he box.

@mithiraudugama800 2 роки тому

You did exactly what you said, this is super helpful. Thank you.

@MicroTypeEngineering 2 роки тому

You're so welcome!

@raytry69 17 днів тому

You're such a good teacher.

@VeryMuchBlessed 3 роки тому

Very good instructive video. Information I've been searching for in trying to improve my circuits. Thanks much for making this.

@MicroTypeEngineering 3 роки тому

Great to hear!

@qaziqazi9727 2 роки тому

Well explained. Thanks sir

@aum55533 2 роки тому

Awesome!!! great explanation, please make a vide for advanced calculations also.

@VeryMuchBlessed 3 роки тому

Just saw the comment below on hooking Mosfets up in parallel. Circuit would consist of two,three, or more Mosfets with all Gates joined, all Drains joined, and all Sources joined, apparently for driving really HUGE loads that one Mosfet could not handle. One UKposts video regarding this is called "Issues on Connecting MOSFETs in Parallel" and addresses some of the problems. It seems that the electric vehicles would have to have multiple banks of Mosfets just to propel the vehicles down the road. Would like to hear your thoughts on this. Thanks again. Great videos.

@MicroTypeEngineering 3 роки тому

I don't have any direct experience with FETs in parallel, but typically the reason people shy away from parallel components is that they won't react the same way to the current across them. In some use-cases (fuses), parallel components are OK, since the resistances even out due to heat. But FETs can have their resistances decrease with heat, causing a runaway condition. (I know Vgs decreases with heat, not sure about Rds off the top of my head.)

@rogerkerr5745 3 роки тому

awesome, great presentation!

@davidandrews8566 4 роки тому

Greetings from the UK. This was a most interesting and informative video thank you. I will now be subscribing to your channel

@MicroTypeEngineering 3 роки тому

Awesome, thank you!

@abdelazizelbekkar6567 3 роки тому

Thank you very much. very clear and instructive video!

@J_Bazzle 3 роки тому

I know this is an old video but you are the first ever educational channel I have subscribed too cause I feel like learning from this channel is actually interesting and informative.

@borisfilipovic5253 2 роки тому

Excellent job, bro. Are there oscillators that work on about 150MHz? What is max frequency of your gate driver circuit?

@Roy_Tellason 3 роки тому

One other consideration with regard to the gate resistor is the situation where the MOSFET fails, typically shorted. In that scenario you have a pretty good chance of applying Vdd to the microcontroller pin that's driving the circuit, with usually unpleasant results.

@WilliamHinojosa 3 роки тому

Excellent video mate, keep them comming, very well explained. Subscribed!

@MicroTypeEngineering 3 роки тому

Thanks for the sub!

@notmuch_23 2 роки тому

This is nice to know if I want to use the high-current MOSFETs I have for modding flywheel dart blasters with a microcontroller for, say, a select-fire system.