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Ditto that. I'd never heard of the the TL431 and now I'm adding it to my current project as a (no pun intended) high-accuracy constant current source (sorry *sink*, even). Fantastic!
This is the first video I have seen from this channel. I am absolutely going to be using the power cutout circuit for my battery backup that I am installing in my car for my cameras.
This channel deserves a lot of attention. Simple and direct, he explained much more than several Electronics classes. ❤❤❤❤ Thanks ! ❤❤❤❤ ( From Brasil ! 🇧🇷🌻🇧🇷🌻)
I like your bench. Makes for a nice background when you're explaining things. Great video and packed with so much educational content. I always enjoy watching videos on basic components even if I don't have a project to use them.
9:30 didn't analyze it yet, but that circuit doesn't appear to implement any hysteresis. As you approach the cutoff voltage slowly (like with a discharging battery) the MOSFET gate source voltage will drop linearly and your MOSFET will enter a region where itends up biased in a linear region. It might also start oscillating with the ESR of the battery and load current draw and stuff. For UVP, you need to add some hysteresis or positive feedback so that it cuts power off decisively, and only cut power on again once supply voltage goes above some slightly higher voltage threshold. (for the record, this can also oscillate as a relaxation oscillator as the voltage on a battery could rise up with no load)
It relies on the very sharp transition of the TL431 from on to off as the voltage applied to its Ref pin passes below its internal reference, as it is effectively an amplifier with a large open-loop gain. Nevertheless, I would share your concern about the possibility of oscillations given the stray capacitances inherent in this sort of design. Adding a resistor of about 27K from the drain of the MOSFET to the Ref pin of the TL431 would add about 100mV of hysteresis, but of course could still provoke oscillations if too much capacitance were present at the Ref pin.
You are always the best at explaining things to the depth, i really appreciate your videos and recommend it not only for enthusiasts like me but for all age groups to learn something more, b'caus science and electronics has no limit.
This week I made a 4 cell battery balance shunt. It turned out to be virtually identical to the circuit you presented. Good to know my brain is still functioning since I designed my circuit based on the datasheet. Incidentally, my battery is 2 modules from a Nissan LEAF running into a 1kW inverter, as a backup in case of power failure. The battery is maintained by a 5 Watt solar panel sitting in the window and only supplies 300mA at best. Incase of actually being used and needing to be recharged I'll use a bench power supply when the power is back on.
Nice TL431 circuit compilation. 👍 Of course not all designs was mentioned - I know few others, but I never thought about using TL431 as delay timer - that makes sense. 😉
I found out about these by looking up some stuff I found in an old dvd player on guitar forums, I found a few threads where people were suggesting basically using it in place of a transitor, but what I think is more interesting is its variable diode ability. Since diodes clip signals at different voltages you probably could control how much it clips with a potentiometer, or put a regular diode one way and one of these the other way and control the symmetry of clipping with a pot. Nuts
Thanks for the suggestions to make the TL431 accommodate its usefulness in such a variety of applications. Reminds me of how much I liked the IC555's usefulness. Very well done video presentation. 👍
Brackets can be helpful. eg Ik = (12v-2.5v)/330 also at 9:17 Vcut is the battery voltage so voltage divider step Vr2 = Vref = Vcut(R2/(R2 + R1)) rearange for Vcut including brackets Vcut = Vref (R1/R2 + 1).That might be easier to follow for some people. Plus R3 in undervoltage circuit was not explained. Also it would be better to include feedback for hysteresis. But great video.
Hii Electronoobs is my best electronics teacher, I am your best supporter and also a student, it was such a great content of constant current and more i learned in this video Really thanks to you🙏😅🙂 Wow you are my best always🤤
The time delay circuit can be further improved to actually continue switching states, in other words a TL431 can actually be an oscillator, a peak detect or rc timing circuit can be connected the output where the LED is connected which turns on transistor (preferably a fet) that will actually be able to essentially replace the switch, for instant reset no rc or peak detector is used. For a time delay between the time the output goes high can be achieved by using an rc comparable (possibly another TL431 which will actually make it stay on for a predetermined time and stay off for a predetermined time, potentiometers can be used in both places to change both of those timing intervals independently!
For the battery balancer, please insert a resistor (say 220 or 470 ohms) between the TL431's cathode and the transistors base to limit the TL431's current.
You can also use two of them on a high current shunt for a current relay and detect only a couple of mv before it switches a relay. One provides a 2.5V reference at one end of the shunt. The other end of shunt looks for that 2.5V + shunt voltage. Only a few parts and accurate. 431's are great small relay drivers.
I remember a TL431 contest a very long time ago, the winning project was an audio amplifier for a crystal radio. I suppose with enough of them, you could build a computer.
Perfect explanation thank you. Can you please make a video on using the TL431 as a cutoff device for battery protection. There are some videos but they do not work exactly as mentioned.
“Hello friend, welcome back “ :) Please can you create a video tutorial on how to design a circuit in EasyEda or eggle, because there so many things I don’t understand I end up using veroboards. A good example circuit will be a high frequency inverter (oscillator part and power part, ) from drawing to converting into pcb. That way, many we’ll manage to order those pcb using your links as a way to support the channel too. Greetings from Tanzania 🇹🇿
Thanks. I did indeed learn from this video something new. You have tremendous way of training and presentation. A quick question: what advantage(s) do I get if I join your cannel and pay the subscription fees? Thanks for explaining. Enjoy your weekend
Thanks for your comment. Well, first of all you support my work and each tier has something. Usually, I post the video on the members tab days before the release so you get to see that first. Some behind the camera, download files, ect, only for members. Nothing fancy...
The TL431 is commonly used on the secondary of switch-mode power supplies to tell the primary current to turn off when the output voltage is too high, and vice versa.
Thanks for this video sir, but what will you recommend that I make use of to understand how some of these basic circuits and how they work just like you do 😊 because I'm quite certain that you may not be able to do videos to explain all of them. I really want to know how a 3.7v auto cut off charger works using TL431 zener diode. Thanks sir for your anticipated response.
I wonder if you can also use it for following- -having a capacitor bank charge up from solar and trigger a circuit when it reaches a certain voltage, like solar toy. ( I imagine using a transistor and an SRC) -"reverse delay", like for electro-optic gun sight...vibration sensor senses user moving the gun, turns the sights on for a short time. (by altering the delay circuit)
Interesting and very well explained ! Nice sunday afternoon entertainment ! Still looking for my sunday morning entertainment,... our friend Andreas didn't post this morning... :-(
Arduino Course LEVEL 2 (Spanish): bit.ly/2ZNWgqy
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this channel deserves more attention.. nice topic
Thank you and let's hope more people will engage with this kind of content :)
Ditto that. I'd never heard of the the TL431 and now I'm adding it to my current project as a (no pun intended) high-accuracy constant current source (sorry *sink*, even). Fantastic!
I totally agree,
A lot can be learned in this channel
This is the first video I have seen from this channel. I am absolutely going to be using the power cutout circuit for my battery backup that I am installing in my car for my cameras.
This channel deserves a lot of attention.
This channel deserves a lot of attention. Simple and direct, he explained much more than several Electronics classes. ❤❤❤❤ Thanks ! ❤❤❤❤
( From Brasil ! 🇧🇷🌻🇧🇷🌻)
I like your bench. Makes for a nice background when you're explaining things. Great video and packed with so much educational content. I always enjoy watching videos on basic components even if I don't have a project to use them.
9:30 didn't analyze it yet, but that circuit doesn't appear to implement any hysteresis. As you approach the cutoff voltage slowly (like with a discharging battery) the MOSFET gate source voltage will drop linearly and your MOSFET will enter a region where itends up biased in a linear region. It might also start oscillating with the ESR of the battery and load current draw and stuff. For UVP, you need to add some hysteresis or positive feedback so that it cuts power off decisively, and only cut power on again once supply voltage goes above some slightly higher voltage threshold. (for the record, this can also oscillate as a relaxation oscillator as the voltage on a battery could rise up with no load)
It relies on the very sharp transition of the TL431 from on to off as the voltage applied to its Ref pin passes below its internal reference, as it is effectively an amplifier with a large open-loop gain. Nevertheless, I would share your concern about the possibility of oscillations given the stray capacitances inherent in this sort of design. Adding a resistor of about 27K from the drain of the MOSFET to the Ref pin of the TL431 would add about 100mV of hysteresis, but of course could still provoke oscillations if too much capacitance were present at the Ref pin.
@@RexxSchneider I would fully agree!
@electronoobs, you must pls reply with scientific data
@electronoobs, you must pls reply with scientific data
I tried to put it together for a project, and it didn’t work at all. 😢
You are always the best at explaining things to the depth, i really appreciate your videos and recommend it not only for enthusiasts like me but for all age groups to learn something more, b'caus science and electronics has no limit.
This week I made a 4 cell battery balance shunt. It turned out to be virtually identical to the circuit you presented. Good to know my brain is still functioning since I designed my circuit based on the datasheet.
Incidentally, my battery is 2 modules from a Nissan LEAF running into a 1kW inverter, as a backup in case of power failure. The battery is maintained by a 5 Watt solar panel sitting in the window and only supplies 300mA at best. Incase of actually being used and needing to be recharged I'll use a bench power supply when the power is back on.
One of the best electronics teacher ever
Nice TL431 circuit compilation. 👍
Of course not all designs was mentioned - I know few others, but I never thought about using TL431 as delay timer - that makes sense. 😉
This is most underrated chanel in youtube
I think I tried making an under- voltage protection circuit with this a while ago. I couldn't get it working right, now I might try again, thanks!
what a co-incident! Greatscott also made a video on the same IC this week
This is great. I have a bag of them here since years but never thought about how to use them.
I found out about these by looking up some stuff I found in an old dvd player on guitar forums, I found a few threads where people were suggesting basically using it in place of a transitor, but what I think is more interesting is its variable diode ability. Since diodes clip signals at different voltages you probably could control how much it clips with a potentiometer, or put a regular diode one way and one of these the other way and control the symmetry of clipping with a pot. Nuts
Such a nice tutorial, we need such excellent and dedicated teacher for next level learning!
Actually, I've never heard of the TL431! I've used all kinds of Zener diodes over the years and didn't know about this IC. Thank you.
Thank you so much, @ELECTRONOOBS. Your explanations are so clear, concise, and useful!
You say zener, I devote my full attention. One of my favorite components.
Ever use a LED as a zener? This is a handy way to get an offset voltage and an indicator at the same time.
@@opera5714 honestly that never occurred to me. That is very clever and something I'm going to remember whenever I see an led now haha
finally, there is someone explain me how this component works
THANK YOU
12 minutes well spent 😇
👍🏼 Bro u ar more than a teacher....
Thanks for the suggestions to make the TL431 accommodate its usefulness in such a variety of applications. Reminds me of how much I liked the IC555's usefulness. Very well done video presentation. 👍
Crystal clear explanation. Awesome video. Thank you very much for your hard work putting this together.
Brackets can be helpful. eg Ik = (12v-2.5v)/330 also at 9:17 Vcut is the battery voltage so voltage divider step Vr2 = Vref = Vcut(R2/(R2 + R1)) rearange for Vcut including brackets
Vcut = Vref (R1/R2 + 1).That might be easier to follow for some people. Plus R3 in undervoltage circuit was not explained. Also it would be better to include feedback for hysteresis. But great video.
Hii
Electronoobs is my best electronics teacher, I am your best supporter and also a student, it was such a great content of constant current and more i learned in this video
Really thanks to you🙏😅🙂
Wow you are my best always🤤
The time delay circuit can be further improved to actually continue switching states, in other words a TL431 can actually be an oscillator, a peak detect or rc timing circuit can be connected the output where the LED is connected which turns on transistor (preferably a fet) that will actually be able to essentially replace the switch, for instant reset no rc or peak detector is used. For a time delay between the time the output goes high can be achieved by using an rc comparable (possibly another TL431 which will actually make it stay on for a predetermined time and stay off for a predetermined time, potentiometers can be used in both places to change both of those timing intervals independently!
Good video bro I am from Kerala India 🙏❤️👍
Another great video Andrei. You're right...that is a very useful circuit. Thank you for sharing it with us.
For the battery balancer, please insert a resistor (say 220 or 470 ohms) between the TL431's cathode and the transistors base to limit the TL431's current.
Thank you for this wonderful video! I enjoy learning something new from your videos every time I watch!
The best in internet🌹
You can also use two of them on a high current shunt for a current relay and detect only a couple of mv before it switches a relay. One provides a 2.5V reference at one end of the shunt. The other end of shunt looks for that 2.5V + shunt voltage. Only a few parts and accurate. 431's are great small relay drivers.
I loved your digital voltmeter.
great production quality. Keep it up. But, please, start adding nodes to the schematics printouts.
Simple explanation and graphics.
Cool..Love The Litte Paper Diagrams...
GreatScott! likes this video. :D
Beautiful presentation my man
I remember a TL431 contest a very long time ago, the winning project was an audio amplifier for a crystal radio.
I suppose with enough of them, you could build a computer.
Merci pour cette belle explication très détaillée et utile
I’ve seen GreatScott!!’s video about this, next recommendation was this. Interesting.
Perfect explanation thank you. Can you please make a video on using the TL431 as a cutoff device for battery protection. There are some videos but they do not work exactly as mentioned.
Electronoobs , siempre salvandome el pellejo
بسیار خوب و اموزنده
great video, too much useful info here, but better splitted on 5 or more parts . Thanks excelent premium job !! ⭐⭐⭐⭐⭐
Good information
TL431
Thanks
I haven't got notification for video but I searched for it
I did learn something new. Thank you. 😀
Excellent. Very informative.
You and Great Scott coincided on this topic.
Cool little IC ..
Thank you, that's an informative video, and now I kinda want to go get some of those for my projects 👍
Perfect that's all I need...... Good job bro...
I love it good
Keep uploading videos like this
I have first seen tl431 in 12v adapter as part of feedback circuit. Then i started notice it in almost all smps feedback circuits.
I like this video ..it's very important for my project
Very educative demo.
elegant precision delay circuit !//
Nice topic, respect from indonesia
Wow.. finally i able to know.. pls make understand of other ic like TL431
“Hello friend, welcome back “ :)
Please can you create a video tutorial on how to design a circuit in EasyEda or eggle, because there so many things I don’t understand I end up using veroboards.
A good example circuit will be a high frequency inverter (oscillator part and power part, ) from drawing to converting into pcb.
That way, many we’ll manage to order those pcb using your links as a way to support the channel too.
Greetings from Tanzania 🇹🇿
Love this channel a lot....
Helpful information
Amazing video! Thanks!
Excellent presentation! Thanks
Great explanation
Excellent sir, I have subscribed to your wonderful channel.
Thanks. I did indeed learn from this video something new. You have tremendous way of training and presentation. A quick question: what advantage(s) do I get if I join your cannel and pay the subscription fees? Thanks for explaining. Enjoy your weekend
Thanks for your comment. Well, first of all you support my work and each tier has something. Usually, I post the video on the members tab days before the release so you get to see that first. Some behind the camera, download files, ect, only for members. Nothing fancy...
@@ELECTRONOOBS I just joined your paid channel. Hope to exchange ideas and in case a possible cooperations in the future
I see your manager is watching your every move. 🐈
The TL431 is commonly used on the secondary of switch-mode power supplies to tell the primary current to turn off when the output voltage is too high, and vice versa.
This one is awesome👍👍😊
As always, very interesting content! Muy bueno, gracias por los videos tan interesantes!
Excellent job.man
I really like your videos. better if there are Vietnamese subtitles.
Thanks a lot four your great video .It's really educational .
Excellent. Very informative.
Omg I need to brush up on components Neva knew That existed I need some lol
You could add hysteresis to the voltage protection circuit. I needed one a few months ago and it was hard to get.
Thanks. Good work.
Great explanation thank you
Very informative video! Thanks!
Thanks for this video sir, but what will you recommend that I make use of to understand how some of these basic circuits and how they work just like you do 😊 because I'm quite certain that you may not be able to do videos to explain all of them. I really want to know how a 3.7v auto cut off charger works using TL431 zener diode.
Thanks sir for your anticipated response.
Great video bro .
I wonder if you can also use it for following-
-having a capacitor bank charge up from solar and trigger a circuit when it reaches a certain voltage, like solar toy. ( I imagine using a transistor and an SRC)
-"reverse delay", like for electro-optic gun sight...vibration sensor senses user moving the gun, turns the sights on for a short time. (by altering the delay circuit)
@Hrishikesh Malviy lol. I'm home schooled
@Hrishikesh Malviy nope. PDFs and physical books (sometimes even pirated :p)
amazing, thank you
love your videos. thanks
Very good👍
The FET would need pulsed signal to gate - class D amp.
Sick chip
thanks. good information
Nice topic bro... 😮
quite informative !
Great video. Thanks
Very nice video, thank you :)
You are so cool
Ah my old SMPS output reference friend
Thanks a lot.!!
I will try them all :)
Thank you sir. very useful
Interesting and very well explained ! Nice sunday afternoon entertainment ! Still looking for my sunday morning entertainment,... our friend Andreas didn't post this morning... :-(
He must be working on something cool!
@@ELECTRONOOBS He usually is ;-)
It is not really a Zener diode, It is described as a Adjustable precision shunt regulator