{1164} TL494 / KA7500 based SMPS troubleshooting tips

In this video number {1164} TL494 / KA7500 based SMPS troubleshooting tips. I explained how to test / troubleshoot / repair smps swich mode power supply circuit using TL494 / KA7500 pwm ic.
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#tl494 #ka7500 #howtorepair

[@KonstantinGrigoriadis]

Hello Nice Video, KZbin suggested me your Channel. Regarding Pin 4 (DTC, Dead Time Control, used for slow start mostly) according to the Datasheet the 0% Duty Threshold is between 2.8 and 3.3Vmax(it depends on the Brand of the Chip too, OnSemi, TI,etc.), so 1V to at least 2.5V is a Working Condition, just lower Duty Cycle.

[@HaseebElectronics]

@@KonstantinGrigoriadis moat welcome to my channel Yes pin 4 is DTC AND it also provides zero duty cycle when dtc pin is pulled up It disables the output transistors

[@KonstantinGrigoriadis]

Hello, Yes but 0% duty (disabled Output) is Between 2.8 and 3.3V , values between 1V and 2.8V are Working condition as I wrote, just lower Duty

[@KonstantinGrigoriadis]

Btw, I wrote you a comment with a link to a Schematic of a Similar Power supply like the one you show in your Video, Perhaps its helpful to you if you repair these PSU's, but seems that you have Links deactivated in Comments, so perhaps the comment with the Link is on the Hold Comments. If not I can send it you via Email. Btw. Reverse engineered the : HJS-480-0-300 300V 1.6A Power Supply (Videos are on my Channel) if you want the Schematic, let me know. Cheers, Konstantin

[@HaseebElectronics]

@@KonstantinGrigoriadis best regards 💕 You are right the max threshold is 3.3 volt for zero duty cycle I never disable links or any comments Sometimes some links and some words are held for review by KZbin I will check and see it Special thanks for sharing link

[@HaseebElectronics]

I think KZbin removed the link. I checked held for review section. It is empty If you want You can send to my WhatsApp [phone] Or gmail Ashraf4ta4

[@sifirbir01]

Bilginin sınırı yok. Senden öğrenmek güzel. Allah razı olsun.

[@HaseebElectronics]

Allah razı olsun.selamlar

[@ISO07ISO]

Bu video çok öğreticiydi. Defalarca izleyeceğim. Çok teşekkürler. Seni tanımak çok güzel. İyi ki varsın.👏👏👏

[@HaseebElectronics]

iyi akşamlar, değerli sözleriniz için teşekkür ederim. Allah sizi korusun

[@jefftoll604]

An excellent tutorial on TL494 / KA7500 IC and push-pull style power supply.

[@HaseebElectronics]

it is my pleasure

[@gheorghedavid2515]

Mulțumesc din suflet, ptr acest minunat video, și ptr efortul tău de a ne împărtăși, tainele acestei minunate meserii, am să-l urmăresc de multe ori;Dumnezeu să-ți dea sănătate și putere de munca, să ne trăiești Haseeb!

[@snhongo1]

Its always a great pleasure to watch your very informative videos Sir ...thank you for the knowledge

[@anurasenarathna1703]

Great video. Than you very much for sharing your knowledge and skill.

[@W1RMD]

Thank you! Take care!

[@amirrajkomar33]

Thanks a lot so much informative

[@ayeminthet8567]

Thanks Sir I requesting you.Thanks for your uploading.

[@khanlalavlogs]

Excellent sharing brother

[@n.arumugam7379]

Explainasion Super sir

[@ISO07ISO]

Bir öneri var. Daha önce de yazdım ama gözden kaçmış olabilir. Kartları analiz ederken iki tarafı sürekli çevirince komponentlern yerleri zihinde karışabiliyor. Karışıklığı önlemek kavrama düzeyini arttırmak için bir tarafın görselini ekrana koyup diğer tarafın üzerinde çalıştığınızı gösterirseniz. Komponentler ile diğer taraf arasındaki bağlantı daha iyi anlaşılıp akılda kalacaktır. Saygılarımla...

[@HaseebElectronics]

selamlar. önceki yorumunuz benden kaçmış olabilir. bazen yoğun hayatım nedeniyle tüm yorumları kontrol edemiyorum. şimdi bu mesajı kontrol ettim, bu değerli öneri için minnettarım, daha net olması için ikinci kamerayı eklemek için elimden geleni yapacağım

[@muhammadishtiaq24]

Excellent thanks for sharing this❤❤

[@HaseebElectronics]

it is my pleasure

[@padard]

great videos ! why have 2 diodes with 2 wires from transfo on ground side ?

[@juniorbaptista6587]

Que Deus te abençoe e te ilumine sempre! Minha fonte possui a mesma configuração, porém ao ligar, ela possui 12v na saída, mas ao ligar qualquer lampada de 21w automotiva, há um ruido que vem do transformador principal e a tensão cai para 3v. O que pode ser? Nao há amperagem na saida. Pode ser o ka7500? Posso colocar o TL 494 no lugar do ka7500?

[@susantaatha6468]

Very nice

[@dlladlla22]

❤❤❤❤

[@mtrltoolman]

Thanks dear Sir. I tried to control the current on same power supply by adding a variable resistor as a divider with the resistor between pin #15 & #14 but it reduces voltage with current. How can i control the voltage and current separately on this kind of power supply to make a bench lab power supply? Thanks again.

[@fuppup]

👍

[@OnlyDownload-j8l]

Sir, Assalamualikum. i am your fan & student. please make a power supply for inverter Dc compressor of air conditionar. Otherwise suggest me, how can i make it.

[@electronicsforeveryone7199]

hi mr haseb. How direct drive (inverter section) washing machine circuit board works...? please explain it in a video. thank you

[@لبنيللأبداع]

Very nice 👍🔔

[@HaseebElectronics]

thanks a lot

[@antonismiliakis9427]

dear i would like to ask you after the central fuse that continues in series a resistor how many ohms is it?

[@jcsudeshchannel8224]

Nice good topic

[@HaseebElectronics]

it is my pleasure

[@omaryissa6047]

Hallo Mr Haseeb please I confused smps if work without pwm iç how do work?

[@mawulisallah7331]

Sir, pls what's the name of the tool you used to dissolder the ic?.

[@HaseebElectronics]

it is WELLER WR3M rework station

[@laeeq2242]

Sir 10N60ZG ki jagah per 10N60F laga sakte hain please jawab zarur dijiyega.Thanks

[@manafsaidusaidu9950]

Hi sir, maximam how many number power supply can parellel. Pls reply

[@HaseebElectronics]

we must try to cooenct minimum number in prallel as per requirement load current must be less the 70% of the total of current value (connected in parallel configuration) it will allow a safe operation

[@manafsaidusaidu9950]

I connected, 3 nos powersupply 5v 40A, but current drawing up to 40A only.

[@muhammedaflah7920]

I have these same powersupply .when applying load the 12 v ,5v ,11v @ vcc of ic will drop to 1 to 2 volts.what is the problem.where did i check ?

[@janaathanand3243]

Hi sir, I have a same SMPS with 12v 25A rating, in my case the bridge rectifier is shot circuited, how should I proceed?

[@manmeetk3939]

Sir, in the same SMPS with KA7500 IC, Voltage is dropping from 12V to 1V when load is applied. I've re-soldered the shunt resistors. When voltage dropped on load, pin16 of IC, still had 0V. So OCP not activated. I have replaced resonant capacitor, VCC capacitor, Both DC bulk capacitors, output capacitors, IC and preset. Everything else seems okay but still voltage drops even on connecting a 10W load... Please suggest a way out ..🙏

[@manmeetk3939]

Please respond Sir. I'm waiting for your guidelines 🙏

[@worroSfOretsevraH]

Would be nice if you would repair a modern high power computer PSU. And not buldging capacitors...

[@abcabc-w6i]

Bhai jan power supply ke kit 12v5a wali kasa repair kra.input a rahe ha. Output nahe a rahe plz bata do plz plz

[@HaseebElectronics]

aap ne IC number, power supply model nahi bataaya. please write the power supply model and its switching IC so that i can reply

[@gulkaramarmanikhattak2464]

Respected Sir, if possible, please start about solor inverter repairing in details because Solor inverter problem are increasing day by day which we are facing very great problem in repairing. So I again request to please start the Solor inverter repairing video in details. So we are repairing job smoothly. Thank you brother.

[@abcabc-w6i]

@@HaseebElectronics bhai us ma 4m60 mosfit ha or driver 6 pin wala ha . Chicony technology ke supply kit ha to aj kl pakistan ma fan chalana ka liea use ho rahe ha

[@MohaOmar-u6x]

Excellent explain all your videos sir.....جزاك الله خيرا استاذي الفاضل أشرف على معلوماتك القيمة وجعله في ميزان حسناتكم استاذنا..ممكن شرح moc 3063

[@abcabc-w6i]

Hi