{229} Adjustable Zener Reference TL431 / How To Calculate Programming Resistor To Adjust Feedback
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- Опубліковано 22 сер 2024
- Adjustable Zener Reference TL431 / How to calculate programming resistor to adjust feedback
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Adjustable Zener Reference TL431,
How to calculate programming resistor,adjust feedback,
how to fix smps,
electronics,
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TL431 adjustable voltage reference working principle,
How to calculate programming resistor to adjust feedback
#TL431, #repair, #troubleshooting,
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Thank you so much for this. I have spent countless hours searching the internet for information as to why I cannot get my TL431 to work. You are the only one who clearly explains the importance of maintaining 2.5V on VRef when using with voltage divider. A very important point to know that everyone else seems to miss. You have helped me immensely with my troubleshooting.
You are welcome! it is my pleasure that my efforts are helpful.
please accept my best regards
Very clear explanation thanks for your time & effort
It's been the same with me: huge hours amount trying to understand the Tl431. This video explain this very clearly. Thanks a lot.
Same here, thank you Sir
Really I had missed a tutor like you when I had electronic course. Fantastic explanation with practical circuit. My salute with reverence to your approach in coaching.
it is my pleasure
Hello once again my friend Haseeb! Another Excellent video on the TL431 regulator and I could not continue on to another one of your Excellent videos without showing my sincere appreciation for such a detailed comprehensive understanding. Your illustration through the use of actual parts and their connections in an actual circuit is invaluable. Words cannot express enough the knowledge you have unselfishly provided to me as I actually had to replace a TL431 and it’s optical coupler repairing the power supply back in 2009 in the repair of my JVC 26inch color CRT T.V.. It was quite a challenge as much of my repair work with power supplies had been with the old buky linear type. JVC had very good documentation on their web site in the theory of how the switch mode power supply worked. The problem I was having was random shutting down and not being able to power up. After blowing a few modular type regulators and learning to respect the rectified 300vdc from mains voltage of the hot side, I was able to correct the problem through the replacement of the TL431 and it’s optical coupler. The TL431was a mystery and the only information I was able to find on it was that it was a programmable Zener. You have now solved that mystery for me my friend and I am very grateful to you. Also I would like to mention your video on the SDC2921 pwm 16 pin controller was of great value and how critical it monitored the 3.3v, 12v and 5 volt ATX power supply. I was not aware of the need for all three voltages to be present and operating normal within their ranges unlike the SMPS in modern day Flat Screen SMPS where emphasis is on the +5v standby. Take care my friend as your videos are invaluable.
I love this video because it is in English language, ive learned a lot from this. Thank you sir. 🙏👍💐
Always Mr. Hasseb's electronics explanations with practical circuits will be so informative. I love to watch his videos to enrich my faded knowledge on electronics. Thanks a lot for sharing the wisdom.
So nice of you. best regards for your golden words
explained with great patience and practical demonstration 🙏🙏
dear sir, i was going through few smps feedback circuits , they have different values of resistance for the divider for ex.12v10a smps has Rt of 28k and 24v6a smps has Rt of only 12k.why so?
Everything is Ok, but the Iref is totally wrong. Typical TL431 reference input current will be in the range less than 10 micro ampere, not milli ampere. You should check this. So putting a 625 ohms resistor across 5V supply is totally non sense and it will give you unnecessary power loss and also it reduce the filtering efficiency of the output capacitor. R1=R2= 4.7K is good enough and the circuit will work just fine.
Other than, its very simple innocent programmable reference to design and to explain.
I really appreciate the very clear explanation of this circuit, I was a little confused by the title
as I had just been watching another video on a TLV431 shunt, they did not mention it being a Zener, but it seems that there are two chips with similar names and similar functions.
As I am a complete newbie in electronics, please forgive if this is obvious to others.
THE BEST TL431 EXPLANATION ON THE INTERNET!!!!!!!!!!!!!!!!!!!!!!!!
it is my pleasure that you enjoyed my efforts
Excellent thanks for sharing this informative video keep sharing
Perfect! you are connecting dots I never realized before, thank you for sharing your knowledge with us!
Thank you so much. You set this topic in my mind forever. The calculation of reference voltage set in my mind forever. Thank you so much.
Professor, you have no replacement, you are number 1
thanks a lot for your valuable words. please accept my best regards
U ARETEACHING US IN A SCIENTIFIC WAY AND I AM VERY HAPPY WITH UR LECTURE.
Thank you so much brother.. Apki tamam videos zabrdast hain aur bht mufeed hai khas kr mai ne bht faida uthaya hai.. Mai apki mazeeed aisy behtareen videos ka muntazir hu Allah taala apko is ka ajr e azeem ataa farmaye aameen ❤️❤️❤️
Aameen
Jaaak Allah khair
aap mera urdu channel (haseeb Electronics Urdu) bhi check karein, wahaan meri sabhi videos urdu language mein hoti hein
You are the best UA-camr in pure electronics,infact your language is very clear with vivid explanation,after you explain no question is left.i have combed tru the Internet you are the best.mashallah.
It's my pleasure
please accept my best regards for your valuable appreciation
matur nuwun pak haseeb, panjenengan pinter banget, gelem ngajari,semoga dapat pahala yang banyak pak,
terima kasih pak Haseeb, Anda pandai sekali , mau mengajarkan, JAZAKUMULLAH KHOYRON
I also spent a lot of time learning about this and I got a clear idea from your video God bless you and your family
it is my pleasure
Great sharing ma sha Allah 👍
I solved a smps issue with Haseeb . My power supply had 24v, 12v and 5v output. But, only 5v was right. The others were 29.8v and 14.9v. Thank you.
Wow that's awesome
You are doing great job.
Thank you for sharing your knowledge and experience and taking your time to make videos in english as well, I appreciate it a lot
@@HaseebElectronics thank you
و عليكم السلام و رحمة الله و بركاته
Good explanation thank you very much
best regards and special thanks
Thanks sir, one of the best video on internet for TL431 complete information,
Keep up the good work🙂
special thanks and best regards
Detailed oriented video shared. Masha Allah ur every video is very useful.
Your English is really good man
Also your explanation is easy to understand
U always teach the topics and question we have always be looking for.infact u clear the mysteries of electronics.jazaakallahu hairan
it is my pleasure
best regards
Video is soo informative and knowledgeable
always superb informative video
Clear and very explained..thank you very much
You are welcome!
بارك الله فيك وامنيتي ان يكون شرحك باللغة العربية. تعجبني بشروحاتك مدعومة بالحسابات الرياضية وهذا هو الدليل القاطع.
السلام عليكم ورحمه الله بتوفق ونجاح أخي
Thank you, Jazaka ALLAH Khir
Thnaks for many many information. Essalamün Aleykum from İstanbul
Thanks and welcome
wa alaikum salam dear brother
Thank you brother, may Allah reward you for the explanation🤲🤲🤲🤲🤲🤲🤲🤲
thanks a lot dear brother
اللہ یسلمک
رمضان مبارک
Sir you are best teacher, I selut to you
THANK YOU VERY MUCH I ENJOY WATCHING YOUR VIDEOS YOU ARE AMAZING ELECTRONIC TEACHER.
You are very welcome
You are true engineer
thanks a lot
MasahAllah bhot umada view's aye hein dear brother eis video par MasahAllah kam walo khale yeh video kaam ki hwe gae MasahAllah
@@HaseebElectronics thanks very much
Great VDO WD accurate information 👍
I really like the way you explain things, it simply leaves us with no doubt with the topics. Thanks for your support.
May god bless you sir.Long live sir.nothing else to say
please accept my best regards
This video is the best explanition about to tl431 that i saw .Thank you very much!!
Very good and nicely explained.liked it your vlog.
Thanks sir very nice explanation I am learning from you
wow it is fantastic and technical work. thanks for sharing
Thank you very much. Very good explanation.
best regards
great technical skills keep going
excellent still better if u went over the other side or explained how it can be used as comparator thank you for explaining the potentiometer cct
Good luck sir 🎉
Mashaallah very very informative video sir i have seen much video but your video / information is different thank you very much Mashaallah you have good knowledge continue these type video your video is very helpfull
A lot of info u have MASHALLAH 👍❤
Mr HASEEB excelent video best explainnig of 431 zener reference. Thanks my friend.
Thanks alat brother very clear explain
Thanks and welcome
Good Sharing MashaAllah 👍💕💕
Sir, your way of teaching is very good I am satisfied thank you
Very helpful video uploaded 158 my friend
excellent explanation.thenk you for this a m a z i n g video
Very nice! Ashraf Sahib Allah will give you his reward inshallah.
You are Very intelligent 👌 thanks for a great video
best regards and special thanks
I don't know how can I explain for great thank for your lesson it very beautiful
You are very welcome. best regards
this interesting tutorial my friend thank you for teaching us.
Thanks for this video. So helpful to understand feedback with that Zener I see used on appliance inverter supply boards.
welcome and special thanks. I am happy that my efforts are fruitful
please accept my best regards
thanks a lot for the tutorial.
it is my pleasure
Very nice video sir 👍👏😊💞💞💞💞
thanks a lot
Excellent and very informative video dear friend, have a happy time!!!
Excellent demonstration
Great explanation, but you must make another video on the TL431 current and how it affects the resistors values, and as you can see you have almost fixed resistors values
Thanks for your Informative video.
It is my pleasure 💕
Brilliant. ..nice explanation.
lk#118 gudmorning brother
Informative video
Still watching ..till🙏🙏🙏🙏☝️
very good and informative.
thanks
very beautiful video. Greetings from Switzerland
It's another amazing job of yours...
Absolutely amazing, helpful....
My lots of wishes for more fantastic uploads like that 👍
Nice teaching sir thanks 👍
Awesome video! Thank you! Please check my understanding... If the PSU has a TL431 to fix its output voltage and I want to make the output to be variable, I must set up the the zener reference as follows... 1) R1 will be a potentiometer and R2 will be of a fixed value, to maintain the zener;s minimum amperage requirement. 2) As the minimum zener output voltage is 2.5 volts and the zener requires say 10mA, R2 = 2.5V/0.01A=250 Ohms. 3) Let's say the maximum voltage that the power supply can output, before the transformer starts singing, is 18 volts. R1 would equal (18V_R1V - 2.5_R2V) x (100_TL431MaxmA - 10_TL431MinmA) = 16.5V x 0.09A = A potentiometer of 0 to 183.33 Ohms, configured as a Variable Resistor. Do I have that correctly? Or, do I misunderstand the way the TL431 manages amperage? Thank you for your help. Edit: And, I must remember to increase the voltage rating of the output smoothing capacitor(s) to at least 18 volts, 25 to 35 volts would be better.
18v- 2.5=15.5v .not 16.5 .you made a mistake when calculating vr1
The Genius Personality
best regards and special thanks
@@HaseebElectronics سلامت رہو ہزار برس بھائی جان آپ
For so many years, it has always baffled me how they use 431s (a Voltage Reference) to directly regulate output voltage of an SMPS. I never knew that they could function as a voltage comparator until I watched this video. Thank you so much. I have a question though. Since the 431 turns the Optocoupler "hard" on or off when reaching vRef, how does the SMPS not oscillate in its voltage regulation?
Best regards
When TL431 pin 1 (reference pin) at 2.5 volt with respect to secondary ground (it is done by voltage divider network)
Then TL431 will produce 1.3 volt with respect to +dc voltage of secondary. And a current limiting resistance is connected from +ve rail and optocoupler which is connected to pin 3 of tl431 (output pin)
So out of 1.3 volt, optocoupler will drop 1.1 volt and 0.2 volt across current limit resistor
When optocoupler led will activate, it will conduct the output transistor, which might be switch +volts for amps controller as vcc voltage
Or it may switch offset ground level from 0 volt to 2.5 volt as feedback voltage
Depending on feedback or controlled vcc Voltage the amps controller will adjust it's switching
@@HaseebElectronics How to choose the current limiting resistor of the optocoupler?
Waalaikumsalam brother
Salut dengan pengetahuan yang anda miliki
It's a great sharing ✌️👍👌
Really very informative video for TL431 ever....
Kirchhoff's current law states that the current flowing into a node must be equal to the current flowing out of it. Applied to the VRef node, that gives (VOut - VRef)/R1 = VRef/R2 + IRef. That's one equation with two unknows, R1 and R2, so we are free to choose one of them. Set R2 = 1250 ohms, then VRef/R2 = 2.5V/1250 ohms = 2 mA is the current through R2. That current plus IRef, chosen to be 8 mA, sum to 10 mA through R1. The value of R1 is then determined by the choice of VOut. For VOut = 5V, (VOut - VRef)/R1 = 10 mA gives R1 = 2.5V / 10 mA = 250 ohms. For VOut = 6.3V, (VOut - VRef)/R1 = 10 mA gives R1 = 3.8V / 10 mA = 380 ohms. I think with your choice of resistor values, the TL431 reference pin draws negligible current (datasheet says it can go all the way down to zero).
assalamualaikum...good info,salam from malaysia
Nice explaination.
thanks aalot. stay blessed
Sir, You are genious. The best explanation ever I have observed on SMPS.
WITH REGARDS
ER S S RANA
Nicely explained, but I didn't got it. Why do you use Iref (max rating 10mA according datasheet) to calculate the Rt (=R1+R2). In your calculation the current Iref flows through R1 and R2 and then Vref is ok. If TL431 would really draw any Iref current itselfes, V1 and Vref would be different.
I think, there should be a reason to choose current for calculation other then Iref, shouldn't it?
Great video. Thanks
You are welcome!
Thank you for the math 👍
best regards and special thanks
Excellent brother.
Many many thanks
Super bro Mashallah
nice video it was very informative
stay connected
very good work keep it up and full view from us stay blessed
Good tiching karte hai 👌👍👍👍👌👌👍👌👍
Very nice information sir thanking you
nice sharing dear good work
Good Sharing 👍👌💞 lk
Hey Friend! Thank you very much! Like #4
Very nice & very informative. Thanks.
best regards and special thanks
Nice content and great sharing
Excellent brother,
May Allah live you long & keep smiling