{386} Startup resistor calculation in SMPS design
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- Опубліковано 15 лип 2024
- in this video number {386} Startup resistor calculation in SMPS design, i discussed How to Calculate Startup Resistor or startup Resistance or bootstrap resistor or VCC resistor or Rstartup, to Design SMPS Switch Mode Power Supply. it is useful for calculation to design switch mode power supply (SMPS) for current mode controller using UC3842, uc3843, uc3844, uc3845 or KA3845 or KA3842 or KA3843 or KA3844
or any current mode smps which uses external mosfet to give a UVLO upper limit threshold charging at vcc capacitor. it provides a limited current of 0.5mA to 1mA to charge hold-up capacitor, when ic monitors that the voltage are at UVLO-ON threshold, then the IC takes soft start to drive transformer, so we take output at secondary and vcc / auxiliary / bias winding, which further provides operating current to the ic at 17mA
00:00 vcc startup resistor calculation in smps
00:51 what is startup circuit in SMPS
01:34 how to calculate startup resistance - Наука та технологія
![[396] 400V to 24V SMPS Circuit Reference Design](http://i.ytimg.com/vi/K9v1PzaBA5I/mqdefault.jpg)
![[396] 400V to 24V SMPS Circuit Reference Design](/img/tr.png)
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!
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
So nice explanation
Thanks and welcome
very informative share haseeb bhai
Very interesting. Thanks Haseeb.
best regards and special thanks
Very very thanks for informative video.
Most welcome
Awesome.
👏👏👏
Very informative
best regards
ماشاءاللهBeautiful video
thanks dear
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 .
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
@@HaseebElectronics thanks Haseeb bhai . Khuda tumhe salamat rakhe .
Aameen
Thanks Bhai ji
MashAllah bhai
best regards
Always u r impressive
it is my pleasure, best regards
nice job dear bro, big like
stay blessed
Many many thanks
Very detailed.....thanks sir ji....
Very Good Information Brother. Keep it up.
thanks very much 🙏🙏🙏
Excellent information about vcc resistance
Beautiful information.
thanks a lot
جميل جدا مساء الجمال
thanks a lot. best regards
Many many thanks sir
Most welcome
Great Video as Always Thanks Friend !!!
Great tutorial with great exlpanation my friend.
Mashallah very informative vedio superb work well done good morning 🌄
Good discussion video thanks for sharing! 😍👍
Thanks, incredibly useful lesson
You're very welcome!
thank you very much for explaining in detail.
You are welcome!
Thanku sir🙏
ماشاء الله
اللهم بارك بالتوفيق
Jazaak Allah khair
Thanks for sharing good knowledge my friend thanks welcome please
thanks a lot
🙏good teaching 🙏
Great teaching
best regards
@@HaseebElectronics do tutorial on EMI filter
Sure I started on smps and we will complete it
@@HaseebElectronics okay thanks
Thanks for your convenience
Great video as usual my friend!
special thanks
Great sharing have a nice day love yours performance
Thanks so much
Thank you so much
You're most welcome
Very good video. Very useful. Thank you very much.
You are welcome!
Very informative video
Really amazing to learn real basic. In books, details is scant .
it is my pleasure
I will always see all video and video also very important for me and all my friends.
it is my pleasure
Very useful information Sir Thanks for sharing this knowledge to us
thanks a lot. best regards
Good job 👍👍👍
Helpful video lk👌
Sir ji👌👍👍
best regards and special thanks
🎉🎉🎉🎉🎉❤❤❤❤❤❤🎉🎉🎉❤❤🎉
Very nice .. helpful information
Masha Allah 👍👌🌹
Lk 234 good job. 👌👌👌
Jazaak Allah khair
Jazaak Allah khair
Good job, my friend
just perfect and informative
it is my pleasure
Another amazing presentation 💌
Big Like 👍
thanks bhai
Great Video!! Stay connected.
Thank You Sir
best regards
Mashallah tabark Allah thank you bro. About this great information now I understand this component's work
You are welcome
best regards
Very nice video
Wsalam 👍 wow very nice 👌😘
Informative share thumbsup dear
Best regards
Good day. Great informative upload
thanks a lot dear sister
BIGG LKKKKK#103
very informative video
KEEP IT UP
Very nice analysis Thanks brother...
So nice of you
Great informative video shared brother, like always, keep it up...
Jazaak Allah khair
Thanks.
it is my pleasure
mashaAllah , good work , i like , nice share
Jazaak Allah khair
well explanation
special thanks
Semangat kak sukses selalu ya kak 🙏🙏
Good sharing, big thumbs up 👍👍💯 see you around, have a wonderful day 😊
👍
thanks a lot dear friend
Very nice
*So nice*
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
Good sir
best regards
Good morning 🌅🌄
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
it is my pleasure. it will become more clear in upcoming videos, because i share the lecture step wise. stay blessed
Tnxs
👌👌👍
it is my pleasure
👌👌
اسلام اعلیکم اللہ آپ کو سحی سلامت رکے کوچ دینو سی آپ کے اوردو ویڈیو نہے اتی
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
Goodtiching karte hai 👌👍👍👍👌👌👌👍👍
thanks
Nice sharing. Stay Connected #TeenyTots.
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.
👍👍👍👍
thanks a lot
Sir very good
best regards and special thanks
👍👍
Thanks for the detailed explaination. Can you please share the link of the next part. I could not find.
excelent analysis.thenks professor.
Special thanks ❤️
@@HaseebElectronics
Giorgos your professor hasn't answered my question yet past one year
Yes sir I know that question and I have to discuss that.
If you trust, I have more than thousand questions to be answered, and the every day I receive a lot of numbers of questions
I have a very busy time in my office as I have a big project to manage. I will try my best to discuss your question. I apologize for a very late
@@shafi.j ask the same question to your professor
@@HaseebElectronics
Thanks
Imagine how good this person did in his finals
best regards
Watching for the second time your so good in math sir i hate math
special thanks for your valuable comment
never hate math, it is in our life like " *blood in the body"*
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.
4lk nice
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
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?
Good Video Mr Haseeb. Can you please tell us how to shutdown system in case overvoltage comes from input, like continuous 275V AC?
Sir, can u please explain regarding bootstrap circuit in High side IGBT driver.
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.
best regards. yours question will answered in upcoming session of startup resistor
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
Good evening
please check video number 954 and if you have any question, you are welcomed
In most of the circuits, its value is between 150k to 200k 2W
please sir make a video on discontinuous flyback transformer calculation for ic FL7733A and ic BP3319 MB. in detail.
First comment and view very nice and good work and beautiful video with your adorable abilities pin me
Many many thanks
نفسي احقق الشوط الثاني
thanks a lot
Nice up road.🎤🤗🤗 Like👍1
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.
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
@@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.
Always welcome dear friend