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

13. 12. 2020
342 449 zhlédnutí

Part 2:
Do you want to know more about the Würth Elektronik components? Then click here:
Previous video:
Electronic Basics #23: Transistor (MOSFET) as a Switch:
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In this video we will be having a closer look on how to drive MOSFETs. That means I will show you different examples on how to turn on/off a MOSFET with a microcontroller. We will investigate why and how much gate current is flowing and how the gate capacitance pretty much forces us to use a MOSFET driver at some point. Along the way you will also learn about what bootstrapping is and when to use it and you will hear a tiny bit about a gate-drive transformer. Let's get started!
Websites which were shown during the video:,as%20shown%20by%20Equation%204.&text=Switch%2DMOSFET%20gate%20losses%20can,and%20turn%2Doff%20gate%20losses.
Thanks to the Würth Elektronik eiSos Group for supporting this video.
2011 Lookalike by Bartlebeats
Killing Time, Kevin MacLeod

  • Part 2:

    GreatScott!GreatScott!Před měsícem
  • Quality Content 😊

    Rameshwar GadekarRameshwar GadekarPřed 3 dny
  • Nice one.

    Rameshwar GadekarRameshwar GadekarPřed 3 dny
  • I like how he is soldering while it's running 😅

    F TF TPřed 4 dny
  • 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.

    John McClainJohn McClainPřed 8 dny
  • I notice you use the oscilloscope to measure the time for the MOSFET to activate in ranges of 300 ns or less. I guess this will mean that you need a quite expensive oscilloscope with a fast samplerate just to determine if you need a resistor for protection of a microcontroller. True, or am I missing something?

    Even LundEven LundPřed 11 dny
  • zu sehen wie du mit einem Schraubenzieher in der Nähe jedes Bildschrims und auch vor dem eines so teuren Oszis entlangfuchtelst mach mich immer ganz kirre😂👌

    Tiro 1999Tiro 1999Před 15 dny
  • hi...PLEASE HELP, I have a TC4429 Driver chip and a IRF4905 P channel mosfet. I want to make a High side PWM drive. (it must be a high side driver as the negative of the load is PERMANENTLY connected to the Battery's Negative.) I have put a 10k resistor from gate to positive, if i run the TC4429 on 12V. and the load is a 12v load.... no problem it works fine. However I want a 24V output and when i connect the mosfet to 24v then the TC4429 is still run on 12v, i think it does not provide sufficient voltage to the gate.... is that right and how do i solve that. I'd really appreciate any help.

    Ian MooreIan MoorePřed 17 dny
  • Posso usar o ULN2803 como driver para mosfet?

    Fernando BSFernando BSPřed 19 dny
  • Great video!!!! Could you make a video showing a mosfet driver for high voltage power mosfet on a spot welder. One using 18 or more mosfets. I have searched and there are no videos that show this

    David BahrDavid BahrPřed 25 dny
  • Question: Why do you need numerous BJT transistors in his example mosfet gate driver schematic (not the IC)? Wouldn't 1 suffice to switch an external power source to the Mosfet Gate, charging it and switching it more quickly?

    RoscoeTheDogRoscoeTheDogPřed 27 dny
  • Can i use a mosfet to turn on a led strip conected with a arcade joystick when i press everytime the button of the arcade joystick the joysticl have 10 so im gonna need 10 mosfets right 1 for every botton??

    ImValentinImValentinPřed 29 dny
  • 5 voltios ÷200 omh =56 miliamper? No entiendo Creo que debe ser 25 miliamperes. Si son 25 miliamperes, creo que deberían ser 21 nanoculons, no soy experto, corrigeme si me equivoco

    Sergio Daniel AlarconSergio Daniel AlarconPřed měsícem
  • nice

    Creative E projectCreative E projectPřed měsícem
  • Hi Scott a quick question, Im building a SSTC and im powering my driver circuit with 12VDC and I try to measure the output right after the mosfet drivers and I only have 1mV of voltage in the output By the way when I meassure in the pins I have the 12V. Why would that be? PS: I have wire it all correctly according to the datasheet and my frequency is coming out ok as well

    Hugo BentoHugo BentoPřed měsícem
  • Good explanation 👍👍👍👍

    Uthman JtaUthman JtaPřed měsícem
  • Waiting for part 2

    Jack PeterJack PeterPřed měsícem
    • Coming this week

      GreatScott!GreatScott!Před měsícem
  • Absolutely love your description, I watched this about 3 times already, and would still watch it again ! , thank you very much Scott

    Heider SatiHeider SatiPřed měsícem
  • MOSFETs should be kept in antistatic bags or conductive foam ... not rattling around in a plastic box. They should also be handled properly. You can easily blow the gate oxide by mistreating them.

    Graham HolmesGraham HolmesPřed měsícem
  • my brain isn't healthy enough to get into the zone ( me/cfs aka long covid ) but I just wanna say that I always found these videos to be very Zen, whereas many electronics videos can be frustratingly confusing.

    ash0787ash0787Před měsícem
  • Brave 👏🏾👏🏾👏🏾👏🏾👏🏾

    Osvaldo NetoOsvaldo NetoPřed měsícem
  • What the heck did I just not learn?

    YuppiYuppiPřed měsícem
  • Great Scott!

    Mayuresh ArankalleMayuresh ArankallePřed měsícem
  • Your OCD with writing instruments drives me nuts... but you are genius!!!

    Bruce L.Bruce L.Před měsícem
  • Your pronunciation of the English word "series" sounds like "serious" to me. A better pronunciation is like: [SEE-reez]. Keep creating great content!

    Terry SmithwickTerry SmithwickPřed měsícem
  • You're Blinking Awesome!

    Hal AsimovHal AsimovPřed měsícem
  • Could you have just used a non smd MOSFET drivers like IR2127S to make it easier?

    FieryFireFieryFirePřed měsícem
  • Wish I would have started this when I was younger......I'm lost......What's the best beginning kit????? Would it be the raspberry pi or........????????thanx in advance

    The EdgeThe EdgePřed měsícem
  • Very interesting video ! Thank you once again

    tigox bratatigox brataPřed měsícem
  • Would a driver IC be needed if runing pwm out of an arduino at 1khz?

    big_mzbig_mzPřed měsícem
  • Hello, I'm planning to make a H bridge with 16 mosfets in parallel to share currents. what should i know first before making one?

    Putra AdriansyahPutra AdriansyahPřed měsícem
  • Are IGBTs driven the same way ?

    shodanxxshodanxxPřed měsícem
  • I believe it's Metal Oxide SUBSTRATE Field Effect Transistor

    Icaros SavvidesIcaros SavvidesPřed měsícem
    • No. Literally the first post when doing a google search.

      GreatScott!GreatScott!Před měsícem
  • ....... here’s me thinking that I could just use a IRLZ44N for everything and relax. My dreams are rubbed out with the highlighter pen as I am forced into the dark corners of the data sheet. The vid then finishes with “..... you don’t know half of it yet” from the man who picks up the fet by the legs with his fingers!

    whitefields5595whitefields5595Před měsícem
  • You write numbers like a German. Are you German?

    bobingaboutbobingaboutPřed měsícem
  • Sometimes I think I'm kinda smart. This isn't one of those times. No idea what's going on.

    ummduhgmailummduhgmailPřed měsícem
  • Thank You!

    HuRuStavHuRuStavPřed měsícem
  • Dear Great Scott, pls.explain mosfet turn on using the transformer.

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

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

    reino kotzereino kotzePřed měsícem
  • You use "C". You are a criminal.

    MichaelKingsfordGrayMichaelKingsfordGrayPřed měsícem
  • For diy, a soic (1.27mm pitch) would not need a stencil, and they make one: NCP5901BDR2G

    Tony PTony PPřed měsícem
  • Any suggestion for an alternative to the LMG1210 that comes in a slightly bigger package? SMD is fine but - I fear that's too tiny for me.

    Torsten CurdtTorsten CurdtPřed měsícem
  • THANK YOU!!! I've been wondering this for years but always forgot to look into it!

    Ryan S.Ryan S.Před měsícem
  • i understood nothing but enjoyed it thoroughly

    TheAMGReviewersTheAMGReviewersPřed měsícem
  • Please were is part 2?

    Ifeanyi GhandiIfeanyi GhandiPřed měsícem
  • that explained why my friends Arduino Nano keeps dying after a few months

    Nguyễn Anh TàiNguyễn Anh TàiPřed měsícem
  • The fact that he solders components together instead of using the breadboard to connect them bothers me more than it should

    Stan HunnekensStan HunnekensPřed měsícem
  • JLCPCB : hummmm....scott! Don't be double-faced!

    BOBYBOBYPřed měsícem
  • Bro you have a breadboard why do you do so much soldering? Great video explanation by the way

    Rodrigo Martín del CampoRodrigo Martín del CampoPřed měsícem
  • 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.

    ACE1027ACE1027Před 2 měsíci
  • Thanks for sharing good electronic knowledge with us.. GreatScott👍👍

    kepala2desakepala2desaPřed 2 měsíci
  • Good handwriting 😀

    sanath kumarsanath kumarPřed 2 měsíci
  • They are always necessary....

  • over complicated explanation...+ There are a lot of mosfet drivers that u can use far more easily.... at the end do not give a real answer ...

    Real TeslaReal TeslaPřed 2 měsíci
  • What other semiconductor is more efficient than MOSFETS ???? Thanks

    Victory FirstVictory FirstPřed 2 měsíci
  • 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.

    the Hearththe HearthPřed 2 měsíci
  • Good job master..

    Yuris elektroYuris elektroPřed 2 měsíci
  • So the mosfet drivers are so bad

    Yuvan santhosh techYuvan santhosh techPřed 2 měsíci
  • You touched the gate and then the led went on... It would be good to highlight the danger of esd when handling mosfet. If the gate voltage exceeds the permitted gate voltage the mosfet is damaged and one can search the faults for a long time.... This is why one should use proper esd protection all the time. Static electricity on the plastic or on the body can Ruin weeks of work...

    Thorsten WilmerThorsten WilmerPřed 2 měsíci
  • How can I calculate maximum switching frequency of a mosfet driver

    Vishnu P.S.Vishnu P.S.Před 2 měsíci
  • Amazing video!! What if i want to switch on/off an 110v minisplit a/c??? Any mosfet or triac capable of control it?

    ryck fretzryck fretzPřed 2 měsíci
  • I'm new to circuits, what is better mosfet or transistor when switching a highvoltage motor on and off digitally? motor 250mah 6-12V tried transistor as switch vc 100maH 50V external power 9v it burned lol and almost bricked my arduino board

    Paulo Jose CastroPaulo Jose CastroPřed 2 měsíci
  • you can try with a mosfet logic level

    Crash NebulaCrash NebulaPřed 2 měsíci
  • Amazing work GreatScott!, this is yet another example of a series of your invaluable electronics learning resources.

    Matt WillisMatt WillisPřed 2 měsíci
  • Nice video! ... When is it coming the part 2? 👍

    Fabrizio BruttiFabrizio BruttiPřed 2 měsíci
  • I have this issue that has been bugging me since school. As I understand it, PWM sends a pulse train of 500Hz. So you have two transitions every 2 ms. What happens inside an H brigde when the upper and lower mosfet during transition? Is there a risk of both of them conducting at the same time?

    JasonRobards2JasonRobards2Před 2 měsíci
  • 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

    Roger BeckRoger BeckPřed 2 měsíci
  • And here I am, trying to get a mosfet to do exactly the opposite to limit the start-up current of a spindle motor.

    Werner ViehhauserWerner ViehhauserPřed 2 měsíci
  • these days, instead of using bootstrapping circuit to drive upper MOSFET, one can use optically isolated gate drive IC such as TLP250 (or equivalent). This Method is much easier but requires to have more isolated supply ( but this can be easily done using isolated DC-DC converter)

    Sanmveg SSanmveg SPřed 2 měsíci
  • Even though i am 11 years old but still i understand all of your stuff☺

    CRAZY mAnCRAZY mAnPřed 2 měsíci
  • Awesome video! I will look at data sheet to understand more technical information about electronic components.

    Michael WadeMichael WadePřed 2 měsíci
  • 47 amps through that one little pin. . . on a system that will have 8 gauge or so wire everywhere. . . seems so strange they don't have beefier pins.

    Snap-offSnap-offPřed 2 měsíci
  • Thank you so much for this video , it is great ! , Do you know if it is possible to make a PWM control using a MOSFET ? Can you do a video about it ?

    Sebastian DelgadoSebastian DelgadoPřed 2 měsíci
  • Bootstraping is Vcc + Vcap 😁😁

    Khyarul ArhamKhyarul ArhamPřed 2 měsíci
  • Discharge resistor should be placed BEFORE current limiting one, otherwise you're creating a voltage divider on Gate pin.

    Yuri KirsanovYuri KirsanovPřed 2 měsíci
  • 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!

    Brasil28Brasil28Před 2 měsíci
  • thankyou for that explanation sir.. godbless

    BASIC Projects AZSBASIC Projects AZSPřed 2 měsíci
  • Text hide diagram without text Its better and more clear

    احمد حسناحمد حسنPřed 2 měsíci
  • Superb video! many thanks.

    Ian MooreIan MoorePřed 3 měsíci
  • He explain way better then my lecture in school a thousand thumb up for u Scott.

    Zheng Jia Wei TerenceZheng Jia Wei TerencePřed 3 měsíci
  • noob question: I found this with ridiculously high specs 3A, 600V: FAN7392. How is this one different from the z44, used on this channel?

    user73o1u 81716user73o1u 81716Před 3 měsíci
  • would be cool to know about shocking pen (prank pens) circuits in connection with flyback transformers

    user73o1u 81716user73o1u 81716Před 3 měsíci
  • 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.

    movax20hmovax20hPřed 3 měsíci
  • IR2104 mosfet driver was easy for Mosfet high switching applications.why not you try, that

  • Did not understand, but was interesting :)

    Остап КомплікевичОстап КомплікевичPřed 3 měsíci
  • Happy new years, greatscott. Thanks for bringing us all along! I appreciate you!

    Noah LefebvreNoah LefebvrePřed 3 měsíci
  • This is why I use a button to turn on a led.

    PhobosPhobosPřed 3 měsíci
  • This was exactly the video I needed! Thanks :)

    Julian LechnerJulian LechnerPřed 3 měsíci
  • Halo friends, IRFP2907 is an N-channel mosfet, so... I need one more as its P-chanel mosfet, whats number it is for P-chanel ??? or it may be another IRF mosfet pair that is above 75 volts / 200 Amper, Ok... thanks

  • It used to Stand for ‘metal oxide SILICON ...’ ... I wonder when That got changed

    antigen4antigen4Před 3 měsíci
    • Never. These are used as synonymes. But I personally prefer "silicon".

      Notorius MaximusNotorius MaximusPřed 3 měsíci
  • we need a video on snubber circuits that are used within mosfet output sections to prevent high voltage overshoot and ringing when driving inductive loads like in SMPS applications

    TechnologicTechnologicPřed 3 měsíci
  • Curious. Your accent was easier for me to understand in your older video "How to Solder properly || Through-hole (THT) & Surface-mount (SMD)"

    Ben RBen RPřed 3 měsíci
  • sir, i have a plan to make arduino pwm, since the main voltage is 18650 battery, so the voltage will decrease. how i put voltage feedback for pwm ? i failed many time to do that, since no pwm use voltage feedback, except for buck or boost converter....

    henki 1986henki 1986Před 3 měsíci
  • 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!

    Gert VermeerschGert VermeerschPřed 3 měsíci
  • Hey Scott! From the United States here in Texas! Can you build a Radio Circuit? I've seen your video on the crude FM radio and the walkie talkies but I want to see you give a full on AM Transceiver like a ham radio. Solid State or through Tubes. I want to see if you can do it and challenge you.

    3V03V0Před 3 měsíci
  • Hello, I apologize if this is a bad question. At 2:38 are you applying gate voltage to the mosfet with your fingertip?

    bizeigelbizeigelPřed 3 měsíci
  • thxs for your video learning...can you make video for testing and information about the SEMIKRON SEMITRNS M SKKR400/0.2-BVR thank you Sir...

    ricardo felizcoricardo felizcoPřed 3 měsíci
  • What about MOSFET driving using charge pump. ?is benifited over drivers ic?

    Avinash PudaleAvinash PudalePřed 3 měsíci
  • i think you should really give a shot at ZVS a circuit

    littleMaklittleMakPřed 3 měsíci