{229} 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 to adjust feedback
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Adjustable Zener Reference TL431,
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29 сен 2024

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Комментарии : 390

@paulanderson1687 3 года назад

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.

@HaseebElectronics 3 года назад

You are welcome! it is my pleasure that my efforts are helpful. please accept my best regards

@veeem3964 2 года назад

Very clear explanation thanks for your time & effort

@ministeriomundialliberando8403 2 года назад

It's been the same with me: huge hours amount trying to understand the Tl431. This video explain this very clearly. Thanks a lot.

@olivierj.2435 2 года назад

Same here, thank you Sir

@WithEmanFatima 4 года назад

MasahAllah bhot umada view's aye hein dear brother eis video par MasahAllah kam walo khale yeh video kaam ki hwe gae MasahAllah

@WithEmanFatima 4 года назад

@@HaseebElectronics thanks very much

@rmjnm 3 года назад

I really like the way you explain things, it simply leaves us with no doubt with the topics. Thanks for your support.

@udhayakumara4033 4 года назад

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.

@nihatkosova8436 2 месяца назад

Thnaks for many many information. Essalamün Aleykum from İstanbul

@HaseebElectronics 2 месяца назад

Thanks and welcome

@HaseebElectronics 2 месяца назад

wa alaikum salam dear brother

@sukhbirrana9779 4 года назад

Sir, You are genious. The best explanation ever I have observed on SMPS. WITH REGARDS ER S S RANA

@uniquetravelandbeauty7026 4 года назад

great technical skills keep going

@snhongo1 2 года назад

You are Very intelligent 👌 thanks for a great video

@HaseebElectronics 2 года назад

best regards and special thanks

@ShineSakshi 4 года назад

It's another amazing job of yours... Absolutely amazing, helpful.... My lots of wishes for more fantastic uploads like that 👍

@roomithegamer2499 4 года назад

Superb you explained it so well so helpful easy to understand good job

@arefmohammadzadeh8560 Год назад

very good and informative. thanks

@mohamedkeita1509 4 года назад

%ASSALAMOU ALYECOUM TA ALLAH WA BARAKATOUHOU% J'admire beaucoup vos efforts pour nous les débutants en électronique. Maître j'ai un problème je n'arrive pas a dépanner l'alimentation de mon écran plat pousse 42 LG j'ai changé un transistor, avec votre permission je vais vous envoyez la vidéo de ce que l'alimentation fait %ASSALAMOU ALEYCOUME TA ALLAH WA BARAKATOUHOU%

@cthoadmin7458 4 года назад

mr. Haseeb, this is brilliant! What better way to learn about SMPS than experimenting with the components? Tell me, would this be a good way to test the low voltage side of a SMPS: Suppose you had a faulty 12 volt PSU. Could you apply 12 volts to the output without powering on the SMPS, then look at the voltage across R1 and R2 and the voltage reference, then measure the voltage across the input to the opto isolator when the applied voltage is less than 12 volts? If the output circuit feedback loop is working correctly there will be a voltage drop across the optoisolator, and the resistance on the phototransistor side will go down, in other words the photo transistor switches on...

@panasotaelectronics8005 4 года назад

ma sha Allah ashrif bhai tell me more about aptocupler

@rahulpatelgujratahmedabad3497 2 года назад

Good tiching karte hai 👌👍👍👍👌👌👍👌👍

@garypoplin4599 21 день назад

25:05 - Haseeb, what is the minimum difference between the applied voltage and the desired output voltage of the TL431? For instance, the recommended headroom for the LM317A adjustable voltage regulator is greater than three volts (Vi-Vo) for stable operation.

@zakiausa 4 года назад

Thanks God bless you

@AbdulMomenZargar60 4 года назад

Mashallah Good Likes Khoshi Huyi Dear Brother All The Best

@supersilve 2 года назад

Very good explanation and well understood. If for example I have a switching power supply which is to be regulated at 80v what one could do to use the TL431 knowing it is only capable for 40v?

@HaseebElectronics 2 года назад

thanks a lot in your condition, i suggest you must use 79V zener diode instead of TL431. this zener will connected in series of the optocoupler. and a current limit resistor must be used in series of these three components

@supersilve 2 года назад

@@HaseebElectronics thanks for the tip. I guess a chain of zener diodes in series to make the required voltage will do, followed by a current limiting resistor. Any idea how to work out the value. Should I consider 80v less the LED voltage in the opto and head for a current of 10mA. Correct?

@HaseebElectronics 2 года назад

exactly perfect. it can be made using combination of series zeners and limit the current using current limiting resistor

@gokhanumut1582 3 года назад

Thank you for your valuable information. Can you explain SMPS working without optocoupler?

@HaseebElectronics 3 года назад

sure i will do it meanwhile you can check video number 168. and i will explain in detail in upcoming videos

@sushilchoudhary5749 4 года назад

Thanks for video

@ChaudhryKitchenVlogs 4 года назад

Great content 👍💐💐warm greeting from Canada 🇨🇦 joined you from Anaya Lv stay safe and be connected thanks 😊

@littlegeniusplayschool459 3 года назад

Dear sir, thank u

@thezahidsisters 4 года назад

Very nice and informative video!!👍 Just joined you!!✨

@sadpoetrydilkiawaz 4 года назад

Good work

@boybravo689 3 года назад

Sir in a multi output switch mode power supply if there's a faulty one one of that output can the shunt regulator sense that output circuit tnx Sir

@Erpankaj925 3 года назад

Sir i have atx power supply with supervisor ic cg8010d. It gives proper 5v SB but when i connect it to line it gives over voltage and shut down immediately. I also used your formula to bypass supervisor ic with external voltage as you told in video but that is not working and same problem occurs. What can i do?

@mon-alarby 4 года назад

بالتوفيق احلى لايك 👍👍👍 نشرت👀👈👈

@suatkaleli5075 9 месяцев назад

can i use this topology on the 82v output charger circuit as the auto cut off ?

@HaseebElectronics 9 месяцев назад

just use a simple zener, that is safer for 82 volt as the maximum (Vk-a) are 40 volt for TL431 regulator

@suatkaleli5075 9 месяцев назад

@@HaseebElectronics i am grateful however for instant i will use the resistors r1 and r2 will be 1k and 32k and tl431 will only trigger the gate pin of the bt153 so please advice the zener value and to where i should place it? before anode or reference pin? thanks a lot🙏

@rmjnm 4 года назад

Sir is ref. Voltage always has to be 2.5 ? Is it a standard value or should we change it ?

@Edmorbus 9 месяцев назад

Thank you so much for this i am working for charging smal li-ion battery charger and want to charge to max 4.18v can you help me 2 Resistors voltage divider TL431 for charging and full 2 Leds 2 Resitors and IRFZ44N for charging I want not over charge the battery on youtube are poor example i have tested and not working good

@Indonesia_harga_mati 4 года назад

0:20 wa 'alaikumsallam warohmatullohi wabarokatuh. Salam from Indonesia.

@jullianhilaire9564 Год назад

Greetings Tutor I want to build a constant current source for a 3.2 volts 1 watt led using TL431A Can you please assist me in calculating the input resistor for the circuit. I am using a 12 volts battery to supply power Thank you in advance Tutor

@MrsRashidSajjad 4 года назад

aslmoalikom bhai anayaa mom ki trf sy slam

@dickschottky9406 10 месяцев назад

Thanks!

@HaseebElectronics 10 месяцев назад

thanks a lot for your valuable support regards

@filzayvlogger7304 4 года назад

Stay connected with us ☺️😃

@karthickcsk7164 4 года назад

🕵️🕵️🕵️

@romerovalin2635 4 года назад

I love this video because it is in English language, ive learned a lot from this. Thank you sir. 🙏👍💐

@user-pq5tz5pn4g 4 года назад

السلام عليكم ورحمه الله بتوفق ونجاح أخي

@viswanathanramakrishnan7613 2 года назад

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.

@HaseebElectronics 2 года назад

it is my pleasure

@janasmeal7916 4 года назад

Great sharing ma sha Allah 👍

@hugoegon8148 4 года назад

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?

@Rodderick45 3 года назад

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.

@ghamor7590 2 года назад

و عليكم السلام و رحمة الله و بركاته Good explanation thank you very much

@HaseebElectronics 2 года назад

best regards and special thanks

@jimmycollege3851 Год назад

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

@michaelmccloy9466 4 года назад

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.

@muhammadishtiaq24 Месяц назад

Excellent thanks for sharing this informative video keep sharing

@carolinediyandvlog 4 года назад

Witaj przyjacielu kolejny super filmik pozdrawiam serdecznie 😄

@AmnaKitchen 4 года назад

Great VDO WD accurate information 👍

@viswanathanramakrishnan7613 3 года назад

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.

@HaseebElectronics 3 года назад

So nice of you. best regards for your golden words

@Foladstudio2023 7 месяцев назад

Haseeb brother please make a power supply with copper wire I mean the power supply should be transparent all the connection should be with copper wire thick copper wire use transistor masfet if you have time please 🙏

@Foladstudio2023 7 месяцев назад

I am waiting

@danielg2 4 года назад

Perfect! you are connecting dots I never realized before, thank you for sharing your knowledge with us!

@user-Abdelaziz 4 года назад

لايكووو😍❤👍

@gabrielquarshie94 2 года назад

Thank you so much. one question that i have is can i modify an existing output of 30 t0 50 Volts with the TL341 ??? meaning adjust the output down to 1 or 2 Volts ??? Please tell me how to.

@HaseebElectronics 2 года назад

yes you can do it, just we need to adjust the voltage divider network resistors if you want to see how to deo it practically then you can check video number 283 & 258

@CookingKhabir 4 года назад

nice vedio

@sunnych659 3 года назад

Sir, fault finding ki problem toh thek h but some time same number ka bjt, fet,MOSFET ,igbt etc nahi milta then what to do?

@HaseebElectronics 3 года назад

please check video number 233

@samiafazal 4 года назад

always superb informative video

@zainElect01 4 года назад

wow it is fantastic and technical work. thanks for sharing

@MrTasniem 8 месяцев назад

Thank you, Jazaka ALLAH Khir

@raysantosray6441 4 года назад

Você entende bem de trabalhos importantes

@Scienmix 4 года назад

first like first comment still watching

@totbenru 3 года назад

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?

@HaseebElectronics 3 года назад

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

@linkanbiswas651 3 года назад

@@HaseebElectronics How to choose the current limiting resistor of the optocoupler?

@gauripartapshanker9197 2 года назад

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.

@FunnySurpriseToys 4 года назад

Hey Friend! Thank you very much! Like #4

@feebyewok 4 года назад

Waalaikumsalam brother Salut dengan pengetahuan yang anda miliki

@Crystalservices Год назад

Sir I am commenting once again to draw your attention. Hello sir, I am facing a problem with Dell desktop pc SMPS. Problem is PFC MOSFET getting shorted after replacing. It's not shorting immediately but after switching on SMPS 2-3 times. In this SMPS a TEA1716T PFC controller is used so my question is how to pinpoint the problem? Is the PFC controller is bad or something else? Original MOSFET is K16A60W replaced with K10A60D, is this MOSFET is wrong? Please help to solve the problem. Thanks 🙏

@CityfoodSecrat 4 года назад

Video is soo informative and knowledgeable

@technology520 3 года назад

Asamu Aleikum Haseeb Electronics I have a smps adapter with 24V-2.09A output. I want to make the output voltage of this 19.5 V. It has opto-coupler and 431 regulator at the output. Original smd resistance values of the adapter are as follows: R1:1822,R2:2050 Here is my calculation for 19.5 volt output:hizliresim.com/I5W88C I calculated R1 = 14474.5 ohms for 19.5 volts output.According to this calculation, I installed resistor R1 in the circuit, but the output voltage fluctuates between 18.5 volts and 19.9 volts.Is the fluctuation in voltage because I cannot fine-tune the R1 resistor? Why does the problem occur? How can I solve it?

@imammaliki420 4 года назад

Programing nice tuto

@LifewithMano 4 года назад

A lot of info u have MASHALLAH 👍❤

@Thomas1980 4 года назад

very beautiful video. Greetings from Switzerland

@nimalvithanage3303 Год назад

Thank you very much. Very good explanation.

@HaseebElectronics Год назад

best regards

@bitdiddle1 10 месяцев назад

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).

@t1d100 3 года назад

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.

@electroFizou 9 месяцев назад

18v- 2.5=15.5v .not 16.5 .you made a mistake when calculating vr1

@HarlavanisPanagiotis 4 года назад

Excellent and very informative video dear friend, have a happy time!!!

@PakistaniFood1168 4 года назад

Good Sharing MashaAllah 👍💕💕

@MicrosiMe 3 года назад

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

@josephineprimo4395 Год назад

Clear and very explained..thank you very much

@HaseebElectronics Год назад

You are welcome!

@semihsenyuz7436 Год назад

Hello Sir, diode forward voltage drop is 1.1V, and also it has current limiting resistor voltage drop 0.3V it makes 1.4V.And Vout of Tl431 is from formula 5V.in this situation, DC bus votlage must be 5+1.4 = 6.4 V for transmitting light?But in your case it transmit 5V?

@khanlalavlogs 4 года назад

Detailed oriented video shared. Masha Allah ur every video is very useful.

@gamingworld2158 4 года назад

Good luck new friend join👍👍

@rosszzzz 3 года назад

You are doing great job.

@مطبخماماحبيبتي 4 года назад

Nice video big like great work keep it up 👍👍👍👈🙋‍♀️🙏🌷🌹🤲👈👀👉

@veeem3964 2 года назад

So at all times we have to maintain 2.5 volts as Vref -right I had made a Auto cutoff battery charger with this 431 and IRFZ34N & spent a lot of time trying to get the correct resistor to cut off at 13.6 volts and finally with trial & error arrived at the correct resistor So now I know how to calculate. Please tell me what is the trigger volts for the IRFZ34N Thanks for your video, keep up the good work

@jokeras2748 4 года назад

Waooo😊😊🙋‍♂️🙋‍♂️👍👍💞

@EuanneHyunaRosas 4 года назад

this interesting tutorial my friend thank you for teaching us.

@jamalmohamed7571 2 года назад

Assalamu alaikum. I need 180v brushed dc treadmill motor in conventional AC 330v with sg3525 pwm ic with load tegulated varriable speed adjust circuit and explanation.

@gamingworld2158 4 года назад

Good luck new friend join 👍 👍

@imammaliki420 4 года назад

Programing nice tuto

@pdanayal Год назад

Very good and nicely explained.liked it your vlog.

@HaseebElectronics Год назад

Thank you so much 🙂

@chuck6753 Год назад

I modified my chagrer from 12v to 5V and change R1 and R2 to 312.Why output voltage does not stable? Could you please tell me what is wrong is it?

@Crystalservices Год назад

Thanks for your Informative video.

@HaseebElectronics Год назад

It is my pleasure 💕

@sundaravadivelums7661 2 года назад

May god bless you sir.Long live sir.nothing else to say

@HaseebElectronics 2 года назад

please accept my best regards

@HETRM 3 месяца назад

explained with great patience and practical demonstration 🙏🙏

@HETRM 3 месяца назад

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?