{386} Startup resistor calculation in SMPS design

[@Rodderick45]

Hello once again brother Haseeb! Another Excellent amazing video. Very well presented and you covered every detail and answered the few questions I did have about “Flyback switching power supplies”. You are truly a gift to the world of electrical and electronics to those who have a sincere desire to excel in this field weather it be as a technician or on the level of engineering. I can appreciate this particular video because it was the “Flyback switching power supply” that gave me my introduction to switching power supplies 12 years ago when I attempted to repair my 21 inch CRT JVC color receiver. JVC on it’s web page had a very detailed description of the theory, physics and workings of it’s “Flyback power supply “. It took many re-reads but I grasped the concept. The actual control of the amount of energy needed stored in the magnetic field being switched by a mosfet power transistor through pulse width modulation at the command of the amount of feedback via TL431 and opto coupler. With the help you have provided by going into deeper detail as to how the TL431 is more of a programmable voltage regulator, the snubber network and power factor correction and all the detail calculations have truly made me better and more confident. Thank you brother!

[@HaseebElectronics]

Best regards and i am thankful for your valuable appreciation. your words are a valuable asset for me. stay blessed please accept my best regards

[@-koora2day744]

JZAK ALLAH JNAH ALFIRDOOS MR HASEEB. My wondering is that ok when IC take voltage from startup resistor first then when IC work so it take voltage from axillary winding, where the voltage coming from startup resistor goes into the resistor so voltage drop so heat dissipated in my head its like to voltage head to head i need to understand and i hope you understand me because i have project to do in my university

[@HaseebElectronics]

Good evening please check video number 954 and if you have any question, you are welcomed

[@meandbabajan76]

First comment and view very nice and good work and beautiful video with your adorable abilities pin me

[@HaseebElectronics]

Many many thanks

[@prakashsharma6186]

Dear , I love your way of explaining . Kindly clear the design aspect of aux winding also. The cap , once started chip , voltage will also appear on aux winding and it will hold the current to chip. Cap will start discharging only when aux winding is unable to provide enough current . So what is design aspect of aux winding. Thx.

[@مطبخطبقالندي-ع8خ]

جميل جدا مساء الجمال

[@HaseebElectronics]

thanks a lot. best regards

[@kmhovlog6185]

Mashallah very informative vedio superb work well done good morning 🌄

[@batistafrose6009]

ماشاءاللهBeautiful video

[@HaseebElectronics]

thanks dear

[@bundadita7505]

Semangat kak sukses selalu ya kak 🙏🙏

[@Dr.QaisarAbbas99]

nice job dear bro, big like stay blessed

[@HaseebElectronics]

Many many thanks

[@rabisankar8288]

Sirji,new aspee machine adapter mein Jo input section mein 8 leg ic hai,uski number kya hoga.number blank hai

[@HaseebElectronics]

blank numbers ka problem hota he check video number 372 pcb per ic ki pin ko dekh ke is ic ka number maloom kar saktey hein us site per jaa kr data enter karein aap ko is ke equivalent number mil jaaein ge

[@vijay.6111]

Sir please explainTransistor based oscillator and drive circuit in smps how it works. Thankyou

[@pcb1962]

Yes please, I'd like this too

[@prakashsharma6186]

@@pcb1962 I am also waiting.

[@muslimelectronic9546]

اسلام اعلیکم اللہ آپ کو سحی سلامت رکے کوچ دینو سی آپ کے اوردو ویڈیو نہے اتی

[@HaseebElectronics]

و علیکم السلام و رحمۃ اللہ و برکاتہ آج 9 بجے ویڈیو آئے گی۔ ان شاءاللہ۔ کچھ مصروفیات کی وجہ سے ویڈیو بنانے میں مشکلات تھیں

[@pepharini]

Very Good Information Brother. Keep it up.

[@khalsa919]

Hello haseeb sir, I m a big fan. I m stuck with a circuit of prestige induction heater in which ap 8012 sw is supplied with 320 v DC and 1,2 pins are connected to transformer primary winding. Please check this out

[@noureddinesghairi2772]

alaikom assalam wa rahmatou allahi wa barakatouhou.... Please i can not understand why you used lower input main voltage (ex 90V) and not upper voltage to calculate resistance startup... the capacitor will charged with a heigh voltage if we applicate 240 V in the input !!!!

[@vijayakumarkumar9190]

Very useful information Sir Thanks for sharing this knowledge to us

[@HaseebElectronics]

thanks a lot. best regards

[@jboy4real]

I used this method for start up resistor calculation and the IC didn't start up because all the voltage dropped in the resistor just few millivolt passing hence using the formula R = V/I simply means the voltage drop accross the resistor must be equal to the product of current flowing through the resistor and the resistance of the resistor. It should be: R = [(Vin min - Vic)/I] I is the startup current

[@agrawal0gaur]

Good Video Mr Haseeb. Can you please tell us how to shutdown system in case overvoltage comes from input, like continuous 275V AC?

[@boybravo689]

Sir the start up resisistor is separte from the snubber circuit sir?

[@HaseebElectronics]

yes dear it is a separate resistor, it is connected between +ve dc rail and vcc pin of the smps controller

[@ikbalalraiksu1030]

Very usefull technical information, seen a lot of search about smps, kindly more detail related to bias winding. How to generate voltage as i know is dedicated winding only. No connection to primer and secondary at transformer, thak for replay or next video

[@مطبخطبقالندي-ع8خ]

نفسي احقق الشوط الثاني

[@HaseebElectronics]

thanks a lot

[@MUHAMMADYOUNUS-j6l]

I have a 60volt ebike charger its led is blinking when I remove secondary winding capacitor it's not blinking. Solution sir plz

[@rajtiwari5972]

Sir mujhe 12v 3-4 watt chahiye 24 hours lagatar 2-3year warenty wala , ek cheta ssa sensor hai we bhot kam current leta hai aur jab we triggered hota hai to jo usse connect hai we 2-3 watt leta hai ,aur mujhe we 24hour chalana hai please make a video ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️ From INDIA

[@FancyBangles]

MashAllah bhai

[@HaseebElectronics]

best regards

[@GulzarFaisal_]

Masha Allah 👍👌🌹

[@rahmanocawni5618]

Hi friend how are you. I hear a noise (like ratel snack) from hover board charger. 42 volt output. And no charge even the lead is green

[@pakelectron3005]

Dear sir urdu waly channel par video 📹 upload nae ho rhe aj kal

[@HaseebElectronics]

yes dear it was delayed due to some busy time

[@GINCHANNELcar_moto]

So nice explanation

[@HaseebElectronics]

Thanks and welcome

[@ramaswamyranganathan9171]

Sir can u explain how to organise components placement in pcb design for proper functioning of SMPS.

[@CliveTrezona]

Very interesting. Thanks Haseeb.

[@HaseebElectronics]

best regards and special thanks

[@ummoibrahimhassan4616]

Aslamo alikum

[@HaseebElectronics]

Wa alaikum salaam dear sister ❤️

[@CookwithNikhat]

Good sharing, big thumbs up 👍👍💯 see you around, have a wonderful day 😊

[@kmhovlog6185]

Great sharing have a nice day love yours performance

[@HaseebElectronics]

Thanks so much

[@louf7178]

Awesome.

[@BricoolinoSenyor]

ماشاء الله اللهم بارك بالتوفيق

[@HaseebElectronics]

Jazaak Allah khair

[@TechnoEveryday]

In most of the circuits, its value is between 150k to 200k 2W

[@directsystems2225]

🎉🎉🎉🎉🎉❤❤❤❤❤❤🎉🎉🎉❤❤🎉

[@rattamarengineer6113]

Sir please make video on amplifier ic TDA2030 and 4440 both

[@jboy4real]

Kindly do a thorough explanation or tutorial on areas to focus on any component datasheet I always confuse on the area of focus on any datasheet

[@microelectronicsworkshop9147]

your no

[@DarsKitchen]

Great Video!! Stay connected.

[@vinodKumar-ig8uu]

Sir my samsung charger three 22 mega ohm resistor in series for startup....why pse...

[@electroniquepassion]

👍

[@HaseebElectronics]

thanks a lot dear friend

[@علىالشمري-ن3م1ح]

من فضلك تطبيق الحاسبة المستخدم ما اسمه

[@irfannazir4867]

Please make a this video in urdu

[@HaseebElectronics]

kzbin.info/www/bejne/kGW6eHqJeM2jrck

[@farihabaloch4805]

Wsalam 👍 wow very nice 👌😘

[@TeenyTots]

Nice sharing. Stay Connected #TeenyTots.

[@STV-th2tv]

Thanks for sharing good knowledge my friend thanks welcome please

[@HaseebElectronics]

thanks a lot

[@hichamtassi1753]

Hello, very interesting with good calculations. My question is: how many volts will be at the VCC capacitor and how to calculate the voltage drop from 320VDC to VCC since i see only one resistor and no voltage divider ? thanks.

[@HaseebElectronics]

best regards. yours question will answered in upcoming session of startup resistor

[@susantaatha6468]

Beautiful information.

[@HaseebElectronics]

thanks a lot

[@kinopy5]

Nice up road.🎤🤗🤗　　Like👍1

[@khanlalavlogs]

Great informative video shared brother, like always, keep it up...

[@HaseebElectronics]

Jazaak Allah khair

[@sheekbikdiy1993]

Good job, my friend

[@nkgamers8380]

Is same formula used for Constant current power supply ?

[@mahdixxx1306]

👏👏👏

[@EngrAbidOrakzai]

Always u r impressive

[@HaseebElectronics]

it is my pleasure, best regards

[@alaelaf8629]

Mashallah tabark Allah thank you bro. About this great information now I understand this component's work

[@HaseebElectronics]

You are welcome best regards

[@syedwaseeminfo]

very informative share haseeb bhai

[@kanchankondhare]

🙏good teaching 🙏

[@pcb1962]

Thank you , I learn more with each video of yours that I watch. I was wondering why the transformer has extra secondary windings, now I have one reason, thankyou

[@HaseebElectronics]

it is my pleasure. it will become more clear in upcoming videos, because i share the lecture step wise. stay blessed

[@rashminaik6039]

Very informative

[@HaseebElectronics]

best regards

[@darshangowda8058]

sir is smps driver and led driver have same design

[@darshangowda8058]

@haseeb electronics thank you sir if you can share the design for transformer and snubber design for led driver sir

[@darshangowda8058]

@@HaseebElectronics thank you sir if you can share the design for transformer and snubber design for led driver sir I am an ec student it would be helpful sir

[@jboy4real]

How can we select the capacitor at pwm vcc winding

[@cookwithwajihaahassan2269]

Good sir

[@HaseebElectronics]

Thanks and welcome

[@ministeriomundialliberando8403]

Thank you very much again!!! But can I ask shouldn't be R= Vin-Vcc/Icc, being Vcc the voltage consummed by the IC, like when we calculate the R for a Led? And, when it comes about the UC3842, how can 16 volt turn it on, since you've told that it has a 34 volt internal zener diode, shouldn't the Vcc voltage be greater than the zener voltage? I ask you this because I've been studing the UC38xx data sheet and noticed this. Thanks a lot; this channel is answering me a lot of questions. I really appreciate you tutorials. I'm always looking forward your videos.

[@HaseebElectronics]

you are welcome. all these points I have to discuss in upcoming video to discuss internal zener and external zener circuits (that is the 2nd part of this video) amps controller have to working regions 1. startup 2. normal working 1. in startup the current will use to charge the hold up capacitor. in tht case we have to use R=Vin min / Istartup. because I'm startup the vcc pin will start from zero volt upon reaching at 15 to 16 volt at UVLO-on threshold, ic will start switching. then it's uvlo circuit will enter in operation mode, I WILL EXPLAIN IN UPCOMING VIDEO the internal zener is 34 volt. that is used as a voltage clamp for protection. to protect this ic to reach at extreme limit (34 volt) an external zener for range 18 to 28v is used at vcc pin. that will protect ic from damage. we will discuss in upcoming session

[@ministeriomundialliberando8403]

@@HaseebElectronics My sincerest thankful; You answer very fast. My respect for taking your time to share knowledge that cost you hard working and many time.

[@HaseebElectronics]

Always welcome dear friend

[@mithunsaha9456]

Many many thanks sir

[@HaseebElectronics]

Most welcome

[@k3lanka]

Thanks for your convenience

[@ScrewBot]

Sir you create videos that we dont find anywhere on youtube. Haseeb sir you have covered major calculations on every components. I have a situation. I have an smps where the output capacitor is blown completely. It is 12v 4amp smps. How will i know how to calculate the capactior Volt and Micro farad for this smps? I hope you understood my question. Haseeb sir mein yeh jaanna chahta hu ke kaise hum capacitor volt or microfarad decide kare circuit mein. Many times same volt capacitor we get but different micro farads. Can you throw light on this topic?

[@bahrimouloud6980]

Thank you so much

[@HaseebElectronics]

You're most welcome

[@abcabdi8523]

Thank You Sir

[@HaseebElectronics]

best regards

[@DeepakKumar-of2uo]

please sir make a video on discontinuous flyback transformer calculation for ic FL7733A and ic BP3319 MB. in detail.

[@DeepakKumar-of2uo]

I will always see all video and video also very important for me and all my friends.

[@HaseebElectronics]

it is my pleasure

[@rajtiwari5972]

Please please please make 12v 1amp cercuit

[@ARA-GAMERS99]

Lk 234 good job. 👌👌👌

[@HaseebElectronics]

Jazaak Allah khair

[@HaseebElectronics]

Jazaak Allah khair

[@umairiqbal2493]

A. O. A sir kya haal hai

[@HaseebElectronics]

Wa Alaikum Salaam Allah ka shukr he bhai

[@cornwallav8r]

Excellent video as they all are. Question...with regards to power, and dissipation of the startup resistor, aren't we only talking about a period of milliseconds, where current flows only from the startup circuit? I mean, once the controller starts, the aux winding creates a similar voltage, and the bias across that startup resistor goes o near zero, dissipating almost nothing, correct? Pardon me if I missed it, or misunderstand the issue. Also, I noticed many designers like to stick with 1/4 watt resistors, so they series connect 2 or 3 or 4 to spread out that startup dissipation, I guess it's cheaper.

[@nafizashila1339]

👌👌

[@mvijayakumar0911]

thank you very much for explaining in detail.

[@HaseebElectronics]

You are welcome!

[@thiruvarursubasamayal8917]

👍👍👍👍

[@HaseebElectronics]

thanks a lot

[@farrukhazad]

mashaAllah , good work , i like , nice share

[@HaseebElectronics]

Jazaak Allah khair

[@vijayakarekar]

Very detailed.....thanks sir ji....

[@tabasumcookingpassion9208]

Informative share thumbsup dear

[@HaseebElectronics]

Best regards

[@hiralifestyle]

Helpful video lk👌

[@babumanikuttan2258]

Good sir

[@HaseebElectronics]

best regards

[@kuchpanktiyajindagiki]

Good day. Great informative upload

[@HaseebElectronics]

thanks a lot dear sister

[@anasory3225]

Thanks.

[@HaseebElectronics]

it is my pleasure

[@chifonlesley3011]

thanks very much 🙏🙏🙏

[@vimaldaslg518]

Sir, can u please explain regarding bootstrap circuit in High side IGBT driver.

[@darshanjoshi5224]

Thanks for the detailed explaination. Can you please share the link of the next part. I could not find.

[@coloradowilderness3139]

Really amazing to learn real basic. In books, details is scant .

[@HaseebElectronics]

it is my pleasure

[@maheshkharwa1836]

Sir ji👌👍👍

[@HaseebElectronics]

best regards and special thanks

[@kmhovlog6185]

Good morning 🌅🌄

[@smartneedlecrafts9211]

Very nice video

[@SiddiquesisterSoniAzmat]

Good job 👍👍👍

[@qaiserqureshi100]

Another amazing presentation 💌 Big Like 👍

[@HaseebElectronics]

thanks bhai

[@sushilchoudhary5749]

Very very thanks for informative video.

[@HaseebElectronics]

Most welcome

[@willsxd0]

Imagine how good this person did in his finals

[@HaseebElectronics]

best regards

[@jvjv6213]

Namaste Haseeb bhai . Me India se hu . Mera naam Vipul jani he . Me aapke sabhi videos bade gour dekhta hu aur aapse kafi kuchh shikhta bhi hu . Mera khud ka electronics items ka repair workshop he . Pr aapse ek gujarish he ki aap hindi ya urdu Me bhi videos bnaye to mere jaise kai sare Indians ko bhi aapse jankari malum ho . Aapke videos bahot details Me hote he . Aur aap ko videos Me bahot like krta hu . Bhagvan aapko aur aapki family ko khush aur salamat rakhe ye meri ishwar se dua he . Thank you Haseeb bhai .

[@HaseebElectronics]

नमस्ते, भाई, मैं आपके प्यारे संदेश के लिए सलाम करता हूँ। यह मेरा अंग्रेजी चैनल है, मेरे भारतीय और पाकिस्तानी भाइयों के लिए, मैं अपने वीडियो अपने उर्दू चैनल ("हसीब इलेक्ट्रॉनिक्स उर्दू haseeb electronics urdu") पर साझा करता हूं, आप उस चैनल की जांच कर सकते हैं, उस चैनल पर मेरे सभी वीडियो उर्दू भाषा में हैं। विशेष धन्यवाद और शुभकामनाएं

[@jvjv6213]

@@HaseebElectronics thanks Haseeb bhai . Khuda tumhe salamat rakhe .

[@HaseebElectronics]

Aameen Thanks Bhai ji

[@mdmijan2634]

Very nice analysis Thanks brother...

[@HaseebElectronics]

So nice of you

[@manilapunjabikitchen8154]

4lk nice