Switch mode power supply tutorial: DC-DC buck converters

Рет қаралды 973,683

9 жыл бұрын

I explain buck converters (a type of switch mode power supply) and how to build a 5V 5A power supply using an LM2678.
Website: www.afrotechmods.com/
Parts:
octopart.com/bom-lookup/781DMaFT
Schematic:
i.imgur.com/iwWnvXv.jpg

Пікірлер: 694

@Afrotechmods 6 жыл бұрын

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@vsftpd 4 жыл бұрын

I like Afrotechmods narration feels like watching documentaries not lectures :-)

@democracyforall 3 жыл бұрын

The best person often does not get the best views or hearers. I got an engineering degree but all electrical old stuff not much electronic, your channel is the best of all. Electroboom is good but you are a great teacher.

@TexasInstruments 8 жыл бұрын

Great video on how to build a DC/DC switch mode power supply. And, thanks for featuring TI's SIMPLE SWITCHER buck converter.

@Afrotechmods 8 жыл бұрын

+Texas Instruments Glad you liked it. Been using your products for years!

@SudarakaMallawaArachchi 8 жыл бұрын

+Texas Instruments I have studied and gone to several lectures on this area, but this 10 minute videos summed it up really nicely :D Kudos +Afrotechmods... keep up the good work :)

@teadrinkingilluminati9173 8 жыл бұрын

+Texas Instruments i didnt expect that...

@scotthow2933 7 жыл бұрын

I wished Ti would have more reference designs for us newbies on their chips. I mean more reference on variable outputs using digital pots and linear pots would be nice. More references on pass power transistors for more current output too. I always throw together a lm317 circuit for 15 amps or more to test audio amplifiers. I could figure this out but would rather not blow out $200 worth of parts before I get close. And as far as I can see, none of their simple switchers, high amp series chips have any reference for soft start circuits. What's the first thing a newbie going to build? A high amp variable voltage power supply . Make it easier for them and get them hooked on your products and they'll use them for life at what ever company they're working for....

@EETechs 6 жыл бұрын

It's sad that none of you guys will do a tutorial video on how to solve feedback loops for compensation networks in switch mode power supplies. You guys always take the easy way out with using devices that have the compensation networks in place. Is it really that hard for people to understand it or is the math too advance that you might scare away people?

@sanferrera 8 жыл бұрын

Just when I started to get very, very nervous, Arnold came and saved me.

@jhubertful 6 жыл бұрын

lol same

@greatscottlab 9 жыл бұрын

Arnold interrupted the best part. Such a buzzkill !

@Afrotechmods 9 жыл бұрын

Arnold sure loves killing things.

@mdarifurrahman5674 6 жыл бұрын

honestly I almost fell off laughing when Arnold interrupted...lololol big thumbs up

@ChristopherJones-ck2zh 6 жыл бұрын

And a suitable slope comp- SHUT UPPPPP! Really Arnold, you are a buzzkill.

@aheckers 6 жыл бұрын

What...?

@martinkuliza 5 жыл бұрын

@@aheckers Basically everyone was saying, You're a buzzkill.............STOP BEING A BUZZKILL

@minkorrh 2 жыл бұрын

It's good that these videos are available and teaching people. I really appreciate the time it takes for yourself and other engineers like Dave at EEV blog, Mr Carlson, Great Scott, and everyone else creating these videos explaining electronic theory.

@Afrotechmods 2 жыл бұрын

Glad you like them!

@RimstarOrg 9 жыл бұрын

Nicely done! I like that you also give explanations for why each component is there. Thanks for these.

@DIYPerks 9 жыл бұрын

Great stuff! I'm learning a lot from your videos. Keep up the excellent work! Loved how you broke it up with occasional jokes, hehe.

@filenotfound__3871 3 жыл бұрын

Not expected to see you here :D

@LightmingGamer 3 жыл бұрын

Oooo u r real ....

@Yahweh_Is_Great 7 жыл бұрын

man i can't stress enough how helpful this was, i've been looking into buck converters for awhile now to step down a solar panel and increase my current to a demanding load. I was on the verge of making my own converter with a self-programmed controller b/c i couldn't find an IC on mouser lol your explanation and guidance to TI's simple switcher saved me a LOT of time...Thank you

@dtm876 9 жыл бұрын

There are some pretty expensive books and people with extensive credentials that can't explain this as simple as you have. Thank you. :)

@ElectronFunCom 9 жыл бұрын

This video is great! Because of you I started experimenting with buck converters. I found out that buying individual parts to build your own buck converter may be more expensive than buying an assembled device. I don't mean wholesale quantities, just 2-3 items for my projects.

@edgars007 9 жыл бұрын

Although I know what you are talking about, I still want to see all your videos from beginning till the end! Great teaching man! I think Arnold is proud of you

@Shroommduke 9 жыл бұрын

NOW I get it! sorta. Where can I get a "crack-head mashing a mechanical switch" and what's it's service life?

@jorgewashington2981 8 жыл бұрын

In my neighborhood. They are everywhere and pretty cheap.

@Shroommduke 8 жыл бұрын

Yea but how long do they last and how reliable are they, and will i have to hide my valuables

@jorgewashington2981 8 жыл бұрын

Yup. They'll pawn your Fluke multimeter for $20.

@Shroommduke 8 жыл бұрын

LOL Crack-heads, real life zombies!

@jorgewashington2981 8 жыл бұрын

Lmao!

@317andrew317 8 жыл бұрын

LOL I literally had my mouse on the back button as soon as Arnold came on, impeccable timing. That was the most hilarious moment of my week, thank you! Your videos are fantastic! 4:06

@jonathanhaynes9950 4 жыл бұрын

I always enjoy your stuff. And you keep it basic without dumbing it down. Excellent.

@seasonedtoker 2 жыл бұрын

Afro always has the explanation that suits my understanding

@PCSolutions94 9 жыл бұрын

Great tutorial! I'm currently trying to debug a couple of server smps's. Very complicated technology, seems like many components are prone to failure. Your explanation was very helpful. Keep it up!

@MyKhalidkhalid 8 жыл бұрын

Man you are a legend. I have benefited alot from your tutorials because they are clear, informative and concise. Thank you very much

@timearly5226 5 жыл бұрын

Thanks for the practical design information that is often left out in college and many text books!

@jointdoggg 5 жыл бұрын

hands down, the best buck converter video on YT. THANKS!

@damiendivittorio6973 8 жыл бұрын

Love your videos man! When you started in on the feedback loop I thought my head was gonna explode! thanks for the alternative. I want to understand all that someday...

@Spacekriek 9 жыл бұрын

Excellent presentation ! Just remember to add "X 100" when you compute efficiency.

@OriginalFreeThinker 8 жыл бұрын

Top Man! Anyone can make a video on buck converters but there aren't many who can do it so well as yourself. Well done and thanks for uploading this excellent video

@PhDFernandoCoach 6 жыл бұрын

Simple, concise and clear. Thank you for sharing this valuable information!

@phazeman2022 8 жыл бұрын

LOVE IT!!! Too many 'informational" videos that talk about how their cousin taught them when they were 5, how how their dog needs to go for a walk....For an hour. You stay on topic. Thanks. Subscribe.....

@MaxGoddur 5 жыл бұрын

Your videos are spot on. Clear and to the point. Thank you just started following you.

@KSITREVS 9 жыл бұрын

I havent seen a video from this channel in a while and they are 10x as better!

@Afrotechmods 9 жыл бұрын

Thanks! There have been a few uploads this year. Check them out!

@matthewkevinkumar2969 6 жыл бұрын

Man ! U r the best ! U totally rock man...I am a noob and just by watching ur videos I can understand many many things about basic electronics. You explain stuff so easily.. You are the best teacher in KZfaq .... Continue to make more videos bro ...!!! Hats off

@TwinkiWinki 5 жыл бұрын

Wow, now. I really understand how buck converter works! Awesome video - sort, easy to understand and really good! Thank you!

@stanislavsberesnevs825 5 жыл бұрын

Wish all the teachers at schools and universities explained electronics the way you do.

@1badpete999 8 жыл бұрын

Wish my electronic teacher back in the days would have been as clear and consise as you are, thanks for simplifying.the information with my short attention span..

@Debirnos 7 жыл бұрын

men a big thank you for all this knowledge not simple for the start but i found all what you do and i know i will learn a lot

@teadrinkingilluminati9173 8 жыл бұрын

yeah, like you got that 69W on accident..

@turnerkirk1920 4 жыл бұрын

This is an absolute BANGER!! So well made. thanks for the knowledge! Especially the PRACTICAL knowledge. I always struggled trying to learn things by theory alone. Like you said, what you learn in school is garbage in the real world!

@zackkrasowski7891 9 жыл бұрын

I think I'm really going to like this channel. Clear and well-spoken... thank you!

@kvlpnd 8 жыл бұрын

Just today I learned the working of Buck converter... It's pretty easy. Thanks for showing in real world.

@oste19 9 жыл бұрын

Awsome work! Understandable, clear and humoristic! Never learnt so easily from a tutorial, never laughed so loud for Mr Schwarzenegger! Keep going!

@Afrotechmods 9 жыл бұрын

oste19 Glad you liked it! He'll be back.

@louf7178 3 жыл бұрын

I didn't know this channel was this good...subscribed

@spieagentl 9 жыл бұрын

Oh my goodness thank you for making this! I didn't cover this yet (just starting sophomore year) but I appreciate this little lesson :D

@Magicus1 8 жыл бұрын

LOL! OMG! The bit with Arnold Schwarzenegger is EXACTLY how I was starting to feel!! Thanks for making your videos easy enough to follow but not so slow as to drag on indefinitely!

@jimadams2473 9 жыл бұрын

Man, this is another excellent video. Thanks for doing this. You inspire me.

@miguellorenzo3726 7 жыл бұрын

I already saw this video weeks ago. Came back for the arnold scene. rofl

@Afrotechmods 7 жыл бұрын

You'll be back.

@kshitijanand163 7 жыл бұрын

You have won the internet for today. Both with the awesome video and the superb referencing comment.

@gmonkman 5 жыл бұрын

You have a gift for presentation. This was really clear!

@RossPotts 9 жыл бұрын

1:12 - "or even a crackhead mashing..." I love the humor this guy puts in his videos!

@TheDrunkenMug 7 жыл бұрын

VERRY informative video, yet again. I learned allot with this one, thanks !!

@NickFrom1228 5 жыл бұрын

Excellent content. You are right on par with This old tony and ElectroBoom. Thanks for the excellent content.

@porag575 9 жыл бұрын

Great tutorial, specially when you skipped the boring portion and you showed the actual events in the circuit board. keep going we are subscribed to you. :) :)

@Dentinvent 6 жыл бұрын

very well made video thanks. Nice burning components shots too.

@rodrigo_dm 7 жыл бұрын

Man i have to tell you, im really into electronics, i was getting very excited as you were showing us the real discrete diagram of a buck controller. Then you showed the easy way, wich is cool, but now i want to know how to build the controller and cant find it anywhere in the internet as nice and well explained as here...

@m3n4lyf 5 жыл бұрын

Same. If you have found the magic search terms for this, I'd appreciate the info.

@DigBipper188 8 жыл бұрын

you shoulda called this video: "How to build an 80+ silver power supply" that's a damn efficient little converter!

@krishnakadam6295 7 жыл бұрын

great video. Gave me a clear idea on how things are in practical. really very well explained. was very useful.

@rioschad3284 4 жыл бұрын

"in the real world, this is garbage" - said every design engineer.

@AppliedScience 9 жыл бұрын

Good stuff!

@Afrotechmods 9 жыл бұрын

Omg thank you!! That means so much to me coming from you!

@AppliedScience 9 жыл бұрын

Afrotechmods Thanks! It's great to see you back on youtube.

@fohdeesha 9 жыл бұрын

my two favorite utuebs in one place. circle of smarts

@pawwel1990 9 жыл бұрын

Arnold shouting "Shut Up" made my day and bought my heart. Subscribe :D

@edgeeffect 8 жыл бұрын

Love the shot of the linear regulator on fire!

@VampyrumFerox 5 жыл бұрын

That Arnold clip was perfectly placed, my eyes had just started to gloss over.

@towhidurrahman4686 7 жыл бұрын

Your videos are really so nice. Thanks for your efforts.

@GuilhermeGomes2 Жыл бұрын

Man.. your channel is soooo good

@Inquire98 5 жыл бұрын

"Thank You", thank you very much for your presentation. I will try this myself 😎

@cameraman1234567890 9 жыл бұрын

Great video Afrotechmods. Buck converters are so much better than linear voltage regulators. I have a homemade portable charger with a usb port that i limited to about 2 Amps and a Buck converter can really do the job. You can also buy cheap buck converters that they install in some cars in Asia for interior lights and stuff on ebay for cheap and they can be a bit more efficient and weatherproof than what you could build from this video. Great explanation about them! 5/5

@michaelgrant3521 9 жыл бұрын

Don't discount linear regulators too quickly! They have their niche too. Without the switching action of a SMPS, they generally have cleaner outputs. They also don't require inductors, which is very important because inductors are by necessity large and expensive(in a relative sense.) With a low dropout linear regulator, one could achieve reasonable efficiencies by keeping the input to output voltage ratio close, though care must be taken not to come too close to the dropout point. As afrotechmods mentioned, in the range of about an amp or lower one could consider using an LDO, and the total solution size, cost, and output ripple would be superior to any switching power supply.

@lagentedelnoc 8 жыл бұрын

Loved when Arnold appeared! great video by the way :)

@anthonyperks2201 8 жыл бұрын

That was a brilliantly instructional video.

@ziadfawzi 5 жыл бұрын

Thank you. The video was very useful and simple.

@saimon1680 3 жыл бұрын

Very interesting video! Great explanation

@Alex1M6 9 жыл бұрын

Nice job getting the LM267x series to work well on perfboard! Without using snubber networks I could only ever get them to give low output ripple by using a PCB with ground plane lol.

@Afrotechmods 9 жыл бұрын

I was pretty impressed that I pulled it off on perfboard too! The huge ceramic caps I used were larger than you would ever need in a commercial design, but they give extra leeway for beginners to make mistakes and still have good performance.

@ihatenumberinemail 9 жыл бұрын

Afrotechmods Will the efficiency be higher if I solder the components directly to each other?

@322doug 8 жыл бұрын

thanks man, i just built it, and it is great, thanks again!!!

@RavenHeartPl 8 жыл бұрын

Very helpful video. Well done! Greetings from Poland

@treegasmicthearborist5763 7 жыл бұрын

Very Nice Video! my friend is learning electronics so i showed him this Video!

@JAKOB1977 8 жыл бұрын

4:06 perfect timing, at least according to my brain in trying to comprihent it all.

@TABE-O 3 жыл бұрын

Maaaaate. Love your videos and sense of humour. What’s your days job. You don’t seem like your normal propellor head.

@Mushketer888 9 жыл бұрын

I was experimenting with 555 step down/step up all you need is mosfet/npn for step-up or pnp/p-mosfet for step down and zener diode+transistor so you pull down reset pin on 555 with transistor (which is pulled up with 10k) voila, you have voltage stabilization maybe tl431 also will work like this if you like my idea

@boyinlove2k 9 жыл бұрын

Excellent video, very well explained.

@fingloidfing3337 8 жыл бұрын

i really laughed at that one.. when ardnold said Shut Up! hahahah

@Blaff3tuur 9 жыл бұрын

Nice to see an EEVblog reference

@Afrotechmods 9 жыл бұрын

Dave is badass.

@iDomoPolyForums 9 жыл бұрын

Afrotechmods He's been getting a bit too much into video blogging instead of electronics lately. :(

@DavidLindes 6 жыл бұрын

Afrotechmods in the future, could you also include a link in the description? Then I could see it without needing annotations to be on (or on platforms that don't support them!).

@Interest023 5 жыл бұрын

Easy to understand for me. Thank you for posting good movie.

@arshidsaeed9222 4 жыл бұрын

Nice and informative video . Sir i request you to plz upload complete video on designing swich mode power suply.

@roynexus6 9 жыл бұрын

Awesome explanation of PWM.

@KostadinIVKostadinov 8 жыл бұрын

Dave is everyones idol :D

@yerrakrishna1699 4 жыл бұрын

Thank you for your support. Excellent

@Sevalecan 7 жыл бұрын

Being an EE student, I'm actually really interested in hearing more about the crap just before Arnold pops in. I'm hoping my control systems class will help me understand it. :P

@mrdanker6756 7 жыл бұрын

Sevalecan Get the book "The art of Electronics". Screw the book your college sells you. It'll explain it guddr

@daniellukonis 9 жыл бұрын

Awesome video. Thanks for the info!

@hadireg 9 жыл бұрын

GREATS VIDS AS USUAL!! THANKS MAN. Respect!

@uberDoward 9 жыл бұрын

Love your vids, man!

@pirateman1966 8 жыл бұрын

Excellent series. No BS, no fluff. Just useful info and tricks. Nice Job. Although, I think you should be charged with "Component Murder".

@awsule 9 жыл бұрын

Nice video Afrotechmods. I was wondering if it's optimal and recommended to use the pre-built ICs (like Maxim, Texas instrument and so on...) for creating Solar inverters. Or is it better to create my own from scratch using microcontrollers and PWM and so on?

@mixolydian2010 9 жыл бұрын

Cool thanks for the video, love the humour..especially Arnie !!

@JonathanTATran 6 жыл бұрын

Excellent explanation!

@ibrahemweb 9 жыл бұрын

Awesome tutorial , Thank You .

@aliozanerbektas 9 жыл бұрын

In the shut up section, I laughed so hard that I almost fell down from the chair. :)))) You are literally an awesome guy!

@bumelant 9 жыл бұрын

Great tutorial! Keep it going.

@kabandajamir9844 2 жыл бұрын

The world's best teacher

@52Warlock 5 жыл бұрын

Excellent video - thank you.

@williamking9707 Жыл бұрын

"Practically idiot proof" Project Farm: "We're gonna test that!"

@w.rustylane5650 6 жыл бұрын

Very nice video tutorial. I was interested in how the inductor played a part in the buck converter. How did you arrive at the 22uH inductor at 6 amps?

@SayWhaaaaaaaaaaaaaaaaaaaaaaat 9 жыл бұрын

this is really interesting channel! joy to subscribe to videos like these

@Bruder_chill 9 жыл бұрын

you are the best teacher in youtube...keep up

@operator8014 8 жыл бұрын

This is my first video from your channel I've ever seen. When you said, "Or even a crack-head mashing a mechanical switch", it was so unexpected, I laughed so hard I damaged something internally.