Here is why MOSFET drivers are sometimes essential! || MOSFET Driver Part 1 (Driver, Bootstrapping)

[@greatscottlab]

Part 2: kzbin.info/www/bejne/eGiooqWcZ7Jgf9k

[@aatifshah8476]

Dear sir i just subscribe to ur channel after this videos will u plz teach us the how to design circuit how to choose what calculation formulae require... to trace the whole circuit .

[@قناةأصواتالطبيعة-س8ز]

Thank you for your amazing video as always. I had a short-circuit in my brain here 4:48, though. What were you doing? I really have no clue what's happening there.

[@revilixjohnsen9496]

Ok sorry im not very talentet in Curcuit stuff but... Is the Condensator not pulling the Drain under the Gate Voltage in stead of adding up the Supply and the Condensator? I realy tryed to Rap my head around it. But i cant see how it schould pull the Voltage over its supply. Bevause 2x 12 Volte parallel are still 12V just in Series they get 24V. So i think the Condensator is "Chargin Negativ" and "Pulling Charge" away from the drain to make the Voltage differenz. Caus it cant charge over its supply.

[@engjds]

Good video, was using it to refresh my knowledge, one point, thermal runaway can be eliminated using a source resistor, so as 'I.s' increase, the voltage across the resistor increases reducing Vgs - just a form of negative feedback, can also be used on bipolars.

[@engjds]

PS: another way, is to generate a seperate power rail above the drain voltage-for those thinking of doing this.

[@johnmcclain3887]

I am so glad so many people like yourself are out there, getting on youtube, and expanding their futures, while teaching. I'm an old fart, I've been working in this field more than fifty years, but you've taught me more than a thing or two, "surface mount, liquid solder, oven soldering", what's this world coming to? Very nice demonstration, thank you.

[@cornoadmin]

It bothers me that you always scrub the highlighter until it smears. Sorry, I couldn't hold it back any longer.

[@alexn78666]

..... I CAN'T EITHER! Finally somebody said it. That and underlining things until that pen is definitely bleeding through the page..

[@dhammikak]

I thought it is only me. it's soooo annoying to see that and writing on the same letter twice.

[@xamax4]

my daughter does the same thing, she is 3y old.

[@gene_Code]

Yea like wait the to dry first before highlighting them!! omg!

[@jvon3885]

@@gene_Code sorry but your sentence is.....let's say, out of order. Kinda the same annoyance.....lol.

[@nate796]

If you made a full blown course of how to get started in constructing technology I’d pay for it. I love these videos would love to learn the basics so I could do projects like this.

[@EternalExistence]

What can I say except give him an award.

[@greatscottlab]

Thanks mate :-)

[@EternalExistence]

@@greatscottlab You are most welcome

[@rxcreativity8441]

Make a fm transmitter

[@panicfarm9874]

Salt bae isn't a good cook and only a butcher

[@hmm3544]

@@greatscottlab can you help me in the 'buck boost circiut' code. in my area attiny is not available ım limited to nano and registers in code not compatible

[@anl2468]

Dude you just resumed my B.S. Electrical Engineerging thesis on like 13 minutes. WTF Just awesome.

[@iNezerroth]

Bullshit electrical engineering? I'm also good at it.

[@alexandersolon6548]

what was your thesis about?

[@anl2468]

@@iNezerroth Basically feels like it

[@anl2468]

@@alexandersolon6548 I assembled a three phase inverter to test different digital control schemes, and evaluate how it affects the output harmonics. So this video summarize the all chapter where i explanied the mosfet's response and why you need the driver

[@alexandersolon6548]

@@anl2468 can i have a link to the paper? i would like to read it.

[@jayk8594]

The slowly blackening tip of the yellow highlighter gives me flashbacks to college.

[@Asu01]

Another reason to use MOSFET driver: cross-conduction prevention that could prevent your Metal Oxide Silicon Field Effect Transistor into becoming Magically Obliterated, Smoke n' Fire Emitting Transistor in a bridge configuration.

[@tatzecom]

b-bridge? As in... FULL BRIDGE RECTIFIER?

[@greatscottlab]

Yep. True

[@PrajjalakChattopadhyay]

Exactly! H-bridge drivers have dead time for that...

[@fabriziobrutti1205]

@@greatscottlab Hi mate... When is it coming the part 2? 👍

[@tonysofla]

Most H-Bridge already have driver and cross-detection or so-called dead-time, if you need the power by using 4 (or 6 for brushless) stand-alone MOSFET's, you should not just use mcu-gpio to drive them that is for sure.

[@sidewinderam9m]

If you had 100 videos about driving MOSFET gates, I would probably binge what all of them today. This is great, thank you.

[@nealmaxwell790]

I have an exam on mosfets in two days. You have no idea how much this helped me

[@DrGreenGiant]

Genuinely the best explanation of MOSFETs and how to drive them I've ever seen. The only thing missing, which can trip people up, is depletion vs enhancement mode for both P and N channel

[@Ritzz45]

You know what, there is something therapeutic and calming about the way you speak. I've been subscribed for years and just had a moment.

[@Bhavesh_g20]

I started viewing your video nearly 4 years ago when I didnt knew anything about electronics and now I know things about electronics still I am enjoying how you explain

[@HoXDipannew]

BYE THE WAY I AM ALSO MAKING ARDUINO PROJECTS PLEASE TAKE A LOOK :)

[@kleindavid9416]

I am blown away of how professional this is...

[@wesleymays1931]

"The *field* of power electronics" IC what you did there Scott :) Edit: Damn, thread ended. Was hoping we'd see more electronics puns.

[@greatscottlab]

;-)

[@SopanKotbagi]

uhh, that was a pun? nah

[@kellyjackson7889]

I Gauss yer trying to be funny.Try to resist the urge to use puns or be inducted into the hall of lame.

[@kellyjackson7889]

@@tinygriffy Really? I'm genuinely Schottk'd!

[@cyantwo936]

Damn, made me lol

[@manojkumarsubramaniam7122]

I work in a start-up environment where new engineers think I over complicate stuff, without properly looking into specifications. Your video will be useful for me to pass them to get educated

[@Fix_It_Again_Tony]

Engineering is all in the details.

[@rohan_4dr]

This is exactly what I was looking for. Really Great scott!!

[@greatscottlab]

Great to hear!

[@fabriziobrutti1205]

@@greatscottlab Hi mate... When is it coming the part 2? 👍

[@scottmorgan5370]

I have no idea what you're talking about, but I do like your videos. Job well done...

[@thesewalkamongstus8367]

Your ability to deMystify some aspects of electronic engineering is of great credit to you, You have helped me so very much as a "Mature" student (I am 62 and still learning.) Many thanks and keep up the good work !!

[@greatscottlab]

Glad to help

[@D-Khaz]

I’d love to see you discuss the consequences of using a 3.3v PWM output as provided by an ESP controller. Currently I have some designs where I’m providing a 15vdc gate driver voltage to facilitate good MOSFET switching, but that’s now a second power supply on the pcb (in addition to the 5vdc one to drive the ESP). The MOSFETs are driving 24vdc LEDs.

[@blanana_m]

Wonderful Video! I didn't know about mosfet drivers before this video but now I know what to do with them, Thanks!

[@greatscottlab]

Glad to help!

[@zvonkoskija8036]

That moment when you find out what to do with mosfet...i remember it very well That was a moment i started to prepare myself for real electronic jobs, old yugoslavian repair equipment, mostly chinese parts and basic knowlege. Today i still work with those tools and equipment but i smoke weed

[@anuragbarhoriya3284]

While Iam watching your video, a music video came where two teenage boy and girl singing rum pum pum song please give the name of artist or link if you can or any one.

[@rxcreativity8441]

@@greatscottlab make a fm transmitter

[@XanthiumIndustries]

we have a youtube channel that deals with Arduino,ATmega328P,Java,Serial programming ,robotics. So if you like these stuff do Subscribe. Sorry for annoying

[@oceans1291]

I've built various circuits based on MOSFETs but all the time Optocoupler based circuits works best for me and also would love to share that it's the only cheap, hassle-free and efficient way to drive the MOSFETs 😄

[@africanelectron751]

This video helped me solve a problem on a product design that came from an outsourced electronics engineer.

[@rogerbeck3018]

I love the detail you provide - I do not understand on the first viewing, but that is the strength of online, view it more than once

[@isettech]

For some of those applications, you can use a MOSFET driver directly to drive the LED Load. The ones for example in my inverter are rated for 9 Amps and actively drive high and low, which is useful if you want to encode data on a fiber or laser diode.

[@movax20h]

Miller capacitance, the one you are talking at 6:30, is why we can't have nice things in the world. It really makes interesting engineering challenge, and is unavoidable. I once was designing high efficiency inverter, and instead of just using 4 MOSFETs, I ended up with 4 MOSFETS plus extra 48 transistors (FETs and BJTs), plus a 16 channel DSP driving scheme. Crazy, but it worked beautiful. Required a lot of simulations, including parasitics. Using driver ICs is probably better tho, both from complexity perspective, isolation, and performance (ICs can bring loop area smaller, and and reduce inductance). Also 4-pin FETs are getting popular, especially the SiC and GaN ones, where there is a separate source pin, just for driving. The pin has own path to the package for source, so there is no voltage drop when there is current flowing, and it has lower inductance, all helping with turnoff time and voltage clamping.

[@Fix_It_Again_Tony]

Very well done videos. You have a natural talent for teaching. You lay out the concepts in a logical way which makes them easy to understand. I have a formal education in electronics, but informal instruction like this through KZbin is really amazing for the hobbyist without a formal education. You have earned a new subscriber. I've used plenty of MOSFETs in a variety of circuits in the past, but even professionals seldom just know how to do these things from memory. Unless you build the same circuits all the time it is often helpful to study some references before designing anything. I think videos like this are even useful for professional EEs who want to brush up on the concepts before diving into a design. I just bought a broken plasma cutter. It works just like a big off-line SMPS by rectifying the 240 VAC in to 350 VDC, then switching the 350 VDC with a variable current limit and rectifying the resulting AC to develop the 10-60A needed for cutting up to 3/4" (19 mm) steel like the proverbial hot knife through butter. On the switching board are 16 FETs arranged in four groups of four in an H-bridge. I can see two rather large torodial gate drive transformers on the board. I am looking forward to the next video to make sure the technical details of using gate drive transformers are fresh in my mind.

[@usmanmehmood55]

Great video. I have been using MOSFET drivers in my designs for quite some time now, without really knowing (or caring, tbh) about their inner working. Thanks to you, I can now make better component selections and designs. :)

[@mohammedyasarshaikh4090]

help me to control a DC motor please, I am using IRF3205, and the 12V geared DC motor is not turning off...

[@CTCTraining1]

Huge thanks for including your workings in the videos ... so often folk try to cover such topics and just hand-wave the selection of component values. Big takeaway... if in doubt, add more MOSFETs!

[@ChristieNel]

Gosh, I've blown up a lot of components learning about FETs. There's a lot to get your head around. It gets even more exciting when you have inductive loads. Gate drivers and bridges definitely are very useful.

[@mohammedyasarshaikh4090]

help me to control a DC motor please, I am using IRF3205, and the 12V geared DC motor is not turning off...Thanks

This is the best video you've made for months! I'm very excited about part 2.

[@kesor6]

I couldn't understand half of it ... but got the gist. Can't wait for Part II to hit that Like again!

[@victordesanderobledo4522]

13:15 "But, of cousre, you don't know everything yet" It's me, in every aspect of my life. Especially when I think I know what I'm doing.

[@ChrisWilliams-pu8pj]

Enjoy the detail you put into your videos...even if I don't always understand what is going on. Thank you!

[@GGBGameplays]

This thing about driving MOSFETs gave me a lot of headaches to undertand when I was developing my first voltage inverter 1 year ago. I wish I could have watched this video back then, it would be a great help. Anyway, great video as always, even not not being a good english speaker, I learn a lot with your videos, it's also a good way to train my listening.

[@HoXDipannew]

BYE THE WAY I AM ALSO MAKING ARDUINO PROJECTS PLEASE TAKE A LOOK :)

[@mattwillis3219]

Amazing work GreatScott!, this is yet another example of a series of your invaluable electronics learning resources.

[@diggleboy]

Great breakdown of one of the world's most popular devices and circuitry. This is used in practically every switch mode power supply out there, including laptop power supplies and desktop PC power supplies, just to name a few. Power electronics including switch mode power circuits will become even more popular with electrification of vehicles. Let's all get ready for dangerous high voltage digital circuits! Yes!

[@vinayakonimani7628]

I never understand your vdos (except a few), but I appreciate your knowledge!! Hats off!!

[@ACMHK11]

Please tell me I'm not the only one who lmao at needing the breakout board. "It only comes in smd." 10:20 PogChamp on getting it down to 70 ns.

[@sam-po2mf]

I wish I could do more of practical, you really set good example with calculation it also helping me with theory and calculation

[@yashsaini3410]

Electroboom is uploading frequently and great Scott too

[@Thamli]

Germany is in hard lockdown again, so not much to do besides making videos, I guess

[@greatscottlab]

I try ;-) One more episode next week and then I will take a longer break.

[@trikinuke]

Check 2 another smart guys youtube channels, 'DIY Perks' and 'Sorin - DIY Electrical Nerd'

[@rohanpawar1603]

u are right brp

[@ultimatebaadshah7013]

@@greatscottlab please cover all MOSFET topic. And Thank you for your efforts.

[@thomascornelissen5858]

Great timing on this subject. I was planning to look into the usage of gate drivers tomorrow.

[@kabandajamir9844]

The world's best teacher

[@WistrelChianti]

So glad I came back and watched this again. Was defo worth the 2nd viewing.

[@terencezjw]

He explain way better then my lecture in school a thousand thumb up for u Scott.

[@yeyee2418]

i've been always confused with the term bootstrapping, now you explained it clearly with the floating ground. great video as always sir!

[@greatscottlab]

Glad it helped!

[@patchnplay]

Really like your in-depth videos on subjects like this one. Saves me lots of time wondering why the magic smoke escaped from my MOSFETs ;-). Looking forward to part 2!

[@RedDeckRedemption]

My HVAC electrical teacher's favorite line; "once the smoke comes out, you can't put the smoke back in" (usually referring to transformers, as several dudes hooked them up backwards 😂)

[@electronicstv5884]

Genau dieses Video hat uns am Samstag in unserer Miltenbecher-AG gefehlt😅 da wussten wir nicht, wie wir unseren Motor steuern sollen...👌

[@Johennessy]

Wieviel Arbeit in dem Video steckt. Krass. Mega, dass du das machst! Bin von Anfang an dabei ;)

[@Delali]

this is very informative Mr. Scott. Really appreciate you taking the time to explain the various pros and cons.

[@greatscottlab]

Glad it was helpful!

[@Delali]

@@greatscottlab which high side low side mosfet driver would you recommend for a DIY inverter circuit?

[@modelrogers.19]

Happy new years, greatscott. Thanks for bringing us all along! I appreciate you!

[@ShahidulsPerspective]

🎯 Key Takeaways for quick navigation: 00:01 🤖 Introduction to MOSFETs in power electronics: 02:13 💡 Practical example: Switching a high-power LED with a MOSFET: 04:57 🔄 Using an Arduino microcontroller to control a MOSFET: 08:09 🔌 Challenges with low-frequency microcontroller MOSFET driving: 10:01 ⚙️ Introduction to MOSFET drivers and MOSFET driver ICs: 11:49 🔌 Bootstrapping for gate voltage in half-bridge circuits: 13:11 🎓 Conclusion and teaser for Part 2: Made with HARPA AI

[@Saint_Oscar]

THANK YOU!!! I've been wondering this for years but always forgot to look into it!

[@sauritinfo2248]

You deliver the right video at right time......

[@bratkartoffel161]

A short summary at the end of such highly information dense video would be great! Keep up the awesome work!

[@HoXDipannew]

BYE THE WAY I AM ALSO MAKING ARDUINO PROJECTS PLEASE TAKE A LOOK :)

[@gavendb]

why is it that i enjoy the pictures you draw as much as the content?

[@quantumlab9130]

Thank you, I was just about to start working on a Tesla coil project and now I know why some designs use mosfet drives and some don’t.

[@MartinPHellwig]

Hey you got Würth as a sponsor, that is a good call from them! I certainly will check their products out!

[@Lionel_Walder]

Comme "Gadget Reboot" des vidéos super claires jusqu'au fond du détail 👍

[@RobRoschewsk]

Professor, will this be on the midterm? This triggered my PTSD from college

[@mansirrabiu7412]

😂

[@inayathussain9236]

This video Could have helped me a lot in my university project. I remember i faced issues just because i wasn't using a gate driver. That time electronoobs video on boost convertor helped me to figure out the issue

[@WistrelChianti]

Such a good explanation with the worked example showing the charge times and average current draw. Correct me if I'm wrong, but my main alarm bells take home from this is that, if using a microcontroller to occasionally switch a mosfet, the resistor on the gate input probably isn't necessary, as the amount of time in a significant over current state is so miniscule, nothing will ever have time to get hot enough to melty melty. However if I'm fast switching a mosfet from microcontroller and the frequency is starting to interfere with the amount of time it takes to actually turn the thing on, I'm essentially spending all of my time *averaging* an over current situation... so in this case I really should be using a resistor (or indeed a dedicated driver).

[@WistrelChianti]

noting of course that average isn't continuous, so it isn't even as bad as suggested but, if the over current is significant, then this makes things worse. I guess a reasonable analogy would be that no one ever died from a static electricity shock... but if we received them at high frequency over a sustained period... we'd be pretty unhappy bunnys.

[@prisedeterre1356]

Very nice , I now understand why I keep blowing up stuff every time I use a MOSFET

[@JohnSmith-gm4fj]

Getting a real Marco Reps vibe here! Great stuff, thank you!!!

[@marc-andreservant201]

Bootstrapping with a diode and capacitor is a great hack. Just make sure your duty cycle doesn't stay at 100% long enough to discharge the capacitor to a voltage that will no longer turn on the MOSFET. For some applications (AC to DC inverter, buck converter with undervoltage protection, etc.) this is a perfectly suitable option.

[@mohammedyasarshaikh4090]

Help me to control a DC motor please, I am using IRF3205, and the 12V geared DC motor is not turning off...Thanks

[@marc-andreservant201]

@@mohammedyasarshaikh4090 Maybe you have connected the MOSFET backwards? If the drain and source are swapped, it will act like a diode instead. If you've checked that, use a multimeter to measure the gate voltage of the MOSFET and make sure your microcontroller is actually commanding the motor to turn off.

[@jamesboby2206]

Great video!! Love the new music. I appreciate the consistency and quality of your videos too. Keep em coming!!!

[@SohailKhan-nn1cx]

Finally some different sponser!!😂

[@jacoscholtz2716]

Thanks so much for your videos. I am a fan. Working my way towards PWM treadmill motor driver and this might help. Waiting for Part 2!

[@jassimjaved3309]

Very Nice and informative video greatscott! These are an absolute gem for engineering students! And they help tremendously in making projects. Thank you for sharing your knowledge with us!

[@thehearth8773]

In your intro, you imply that Vth is enough to fully turn on a MOSFET, which is a misconception that far too many people seem to get. Vth is only enough to barely start conducting, and you need to go a few volts beyond Vth in order to reach the minimum Rdson.

[@moonmatthew]

Yey! Another great video! Watching from state below yours! (Czech Republic)

[@greatscottlab]

Awesome! Thank you!

[@BitwiseMobile]

4:40 Thermal runaway is always fun. I remember one time in lab I accidentally hooked up a BJT wrong and it exploded in my face. We were wearing PPE, so my eye was saved, but a large chunk pinged right off my safety glasses. I probably would have been injured if not for the safety glasses. Remember kids wear your PPE :).

[@mohammedyasarshaikh4090]

Help me to control a DC motor please, I am using IRF3205, and the 12V geared DC motor is not turning off...Thanks

[@markmcgoveran6811]

I love it and I'm going to attempt to use the simple switching system with a little bit of tank circuit and see how it works

[@pete3897]

I'm really looking forward to part two in the serious :)

[@TheOriginalCoda]

Has nobody told him yet?

[@keithking1985]

TIP: When you are filming the scope screen you should keep the camera horizontal, it is easier for us to see the info on the screen. P.S. loved the video and must remember to order some drivers on my next parts buy...

[@markys441]

Great explanation! I knew a bit about MOSFET drivers, but still, I've learned something new from this video :) I'm currently experimenting with gate drive transformers, and I think it is an excellent topic for a video because many people don't know how and why to use them. If there is one thing that would fit here, that is a video about snubber networks :) Thanks for the awesome video and explanation.

[@greatscottlab]

Thanks for the feedback👍

[@franzhagemuller6413]

I would also appreciate a Video about snubber networks

[@BenjaminAster]

Why 1 week ago?

[@EternalExistence]

@@BenjaminAster it is part of his name

[@aps7637]

@@BenjaminAster patreons and members have early access to videos

[@MilkBeastDelExcremente]

Great video! Recently i was struggling to build my own high power H-bridge for controlling dc motors. I can see that your favourite MOSFET's are easily capable of such application. It would be a nice challenge for you to build such an H bridge and i'm sure there are a lot more makers who would really appreciate your help :D

[@mohammedyasarshaikh4090]

Did you created H bridge?

[@paulanthonybridge5741]

You could rasily replace the mosfets in your H-bridge with an indestructible magnetic amplifier. It came before the transistor but is, little known to many, still used in high-power applications.

[@SinisterBlackShadow]

Great video! There were a few things I was missing apparently when I drive MOSFETS. Thanks for the information!

[@joemulhern]

At 8:37, your resistor setup could be improved. With your current setup you’re creating a voltage divider. You should put the shunt before the series resistor instead to get the same benefits with no voltage division.

[@dalenassar9152]

How can it make a difference if they are in parallel?

[@electronic7979]

Very helpful video. I liked it

[@sanfinity_]

Have a wonderfull chrismas and a happy newyear Great Scout🎉

[@greatscottlab]

Same to you!

[@Gamezone-sd3er]

Thanks for this video now I gained a lot knowledge from your videos 👍

[@greatscottlab]

Glad to hear it!

[@Gamezone-sd3er]

@@tinygriffy yupp 😁

[@dariodalcin5177]

Finally the video we have all been waiting for

[@Brasil28]

2:27 min mark: P= 6 ohms times 0.32 amps. I think you meant P= 1.88V times 0.32A= 0.62 W. Excellent video, I watched it 3x!

[@Aramich101]

what are the odds.. i was just looking up how to control DC motors with a mosfet last night! thanks for the vid !

[@HoXDipannew]

BYE THE WAY I AM ALSO MAKING ARDUINO PROJECTS PLEASE TAKE A LOOK :)

[@mandelbro777]

great explanation video best I've seen, and you've surveyed all the major issues one is confronted with using MOSFET's

[@atharvakulkarni523]

dude awesome! also ur handwriting is a gem!

[@rutaElectronics]

this video is so so isefu and entertaining that i wish you finished the so called part 2 in this same video

[@millomaker]

Thank you so much for this video, I understand better now 😉

[@HoXDipannew]

BYE THE WAY I AM ALSO MAKING ARDUINO PROJECTS PLEASE TAKE A LOOK :)

[@millomaker]

@@HoXDipannew Please don't use so much flame emoji in your title 😫 There is a uge mistake

[@HoXDipannew]

@@millomakerOo I got a point I must change

[@HoXDipannew]

@@millomaker thank you for a good suggestion

[@isktuna7077]

Now this made me forget all I thought I knew about mosfets

[@trr3576]

When i watched your videos the first time i thought electronics engineering is what i want..... Now i am in third year Bcs electronics engineering just solving equations over and over :) It is not like the videos

[@Fix_It_Again_Tony]

School is no fun. Work is much more rewarding, but you need a degree for the best engineering jobs. Stick with it. EE is a great field that will not be in decline for many, many decades.

[@trr3576]

@@Fix_It_Again_Tony I am very glad I am studying EE but I did not expect the university to be like this I was very exited but end up with studying to collect marks 💔

[@kiromaisus]

Very clear content. Informative for the beginners. Keep going.

[@JorgeDriver]

Great videos as always! Danke für die tolle Videos, ich lerne viel!

[@MrBOB-hj8jq]

You truly are great Scott, cause this video was great!

[@greatscottlab]

Thank you :-)

[@sunitasharma2536]

Really a electronics lover want this.nice👍.I learner something ❤️😘.love from India😘

[@SevenLeo7777]

If electroboom deserve 10 million greatscott deserve 100 million views🤣

[@PhilipHubbe]

Great video! I watched it twice.

[@reinokotze]

I need part 2, this is the 3rd time watching this vid

[@EDGARDOUX1701]

Great, can't wait for part 2 Scott. Thank you.

[@leozendo3500]

Go a little deeper into bootstrapping and floating ground driving without gate transformer? This feels like a very useful topic