GREAT GREAT VIDEO SIR AMAZING AND INFORMATIVE , PERSONALLY THANK YOU WITH FOLDED HANDS...WORDS CANT SHOW MY REGARDS TO YOU BUT LUCKY TO HAVE U AS A REAL SELFLESS TEACHER...GOD BLESS YOU AND YOUR FAMILY..THANKS ONCE AGAIN SIR
السلام عليكم ورحمة الله وبركاته..my professor hasib think you so much for this demonstration....its very useful for me.... e need learning...the vaccum tubes...if you have a time ser....شكرا جزيلا استاذي الفاضل
Hi Sir, I am a fan of your videos. I learn a lot from your videos. I repair welding machines. Can you please tell me the difference between two igbt 40N60 and 40T60. Can i replace one with the other in welding machine. Most of the igbt Which I replace are blowing up. I even check the gate pulse in DSO and the gate pulse seems normal. What can be the probable cause. Please help.
we cannot replace 40n60 with 40t60, because 40t60 is trenchstop series and it have fast recovery diode inside. while 40n60 is a simple IGBT 40t60 have VCE(sat) 1.55V while 40n60 have 2.5 V
Hello Haseeb, I am currently strungling to to repair a SMPS were the controller is faulty. I could not identify the part no so I ordered the xn1049 - seems to similar to sg6848.. When I switch power on, the gate output shows a burst of 45ms with a small duty cycle. In order to keep working it needs to be controlles by FB. But during startup the optpkoppler ist open und FB ist eg. 5.5V or 4.8v at sg6848. How can that work? What signal delivers gate output during the startup phase? Does it drive the Mosfet as long as FB is controlled by over output voltage? Any hint?
please check VCC pin if it have stable dc voltage or Not. check startup resistor and aux voltage circuit (diode and resistor) it must work. as you mentioned it is in brust mode, that means the IC is trying to start but it fails to find auxillary voltage (on vcc pin, as vcc pin first takes from startup resistor connected on positive DC rail and vcc pin. when circuit will start switching and will recieve feedback, that time it will maintaing its freq at 65KHz) but in your case it is limiting itself at 22KHz brust mode, due to missing of feedback or vcc voltage if feedback pin is high, that means there is something wrong in secondary side, that is most probable reason in your condition
@@HaseebElectronics I checked VCC (it comes from a standby trafo) and GND. The problem is: the original faulty part was a SMD one and it is already discontinued. So I found DIP-version and prepared a workaround. After start the new chip immedeately reduces the duty rate to the lmnit caused by current sense input. So the charging pump creates to less power to push the output to its limit and to start controlling via optocoupler. Does it makes sense to increase the switching frequency from 65kHz up to e.g. 80kHz? May be snubber circuitry or flyback trafo ist damaged. I will check it.
Hello sir I 'm asking many time but you are not give any answer plz sir how to calculate pq core based transformer design and if I have design any a transformer data then how to convert any transformer core data into different core I have already data for pq 3230 now it is coverted into pq2625 etc plz tell me sir
![[387] Is it Possible to Replace IGBT 40N60 with 40T60 ??? IGBT Equivalent](http://i.ytimg.com/vi/mD9OsmDQWLE/mqdefault.jpg)
![[387] Is it Possible to Replace IGBT 40N60 with 40T60 ??? IGBT Equivalent](/img/tr.png)
First comments and view very nice and good work and beautiful video pin me down for the video
Thank you so much 😀
MASHA ALLAH, although it was difficult but you explained it very well, awesome sharing, stay blessed, KAUP STUDIO
thanks a lot
GREAT GREAT VIDEO SIR AMAZING AND INFORMATIVE , PERSONALLY THANK YOU WITH FOLDED HANDS...WORDS CANT SHOW MY REGARDS TO YOU BUT LUCKY TO HAVE U AS A REAL SELFLESS TEACHER...GOD BLESS YOU AND YOUR FAMILY..THANKS ONCE AGAIN SIR
You are most welcome
Lk 16 wonderful brother 👏👏👏👏
Always excellent work keep sharing
thanks a lot
best regards
Very supportive information has been given.
Wow very nice 👌
Very hardworking
It awesome, good and professional relationship is the means to an end.
w salam lk no 21 bhai
very useful
Thanks for sharing good knowledge my friend thanks welcome please God bless you
Very useful information Sir Thanks
thanks a lot
Excellent. Thank you sir.
thanks a lot
السلام عليكم ورحمة الله وبركاته..my professor hasib think you so much for this demonstration....its very useful for me.... e need learning...the vaccum tubes...if you have a time ser....شكرا جزيلا استاذي الفاضل
Wa Alaikum salaam
thanks dear brother
i will discuss vacuum tubes in upcoming days
Walkum aslam great work bhai Allah kamyaab kry ameen
Aameen
Jazaak Allah kahair
Nice uploading brother. Thank you.
i have a laptop charger that RI pin is open circuit.
how to determine the frequency?
trafo for the charger is PQ2620
Thanks brother
Juma Mubarak bhai
thanks dear sister
Pin 1 dan 8 ic sg6848 apakah terhubung? Punya saya terhubung, apakah ic rusak?
Hi Sir, I am a fan of your videos. I learn a lot from your videos.
I repair welding machines. Can you please tell me the difference between two igbt
40N60 and 40T60. Can i replace one with the other in welding machine. Most of the igbt
Which I replace are blowing up. I even check the gate pulse in DSO and the gate pulse seems
normal. What can be the probable cause.
Please help.
we cannot replace 40n60 with 40t60, because 40t60 is trenchstop series and it have fast recovery diode inside.
while 40n60 is a simple IGBT
40t60 have VCE(sat) 1.55V while 40n60 have 2.5 V
Bhi L2263 ki jaga kn sa lag skta h supply h 22 bolt 24Aur 5 nkly h is Mai sy
Great upload Brother
Thank you for sharing
Kon sa diodes kaha use hota h vdo make
SIR I AM LOOKING FOR DATASHEET FOR FA5322 SK8085 these both numbers are printed on 8 pin IC , USE IN SMPS PWM
remont-aud.net/ic_power/
thanks...sir ji
Sir 6842 ko 2269 smd ic chalega kya
Ob 2263ap Ka input katny voltage pr Kam karta hn
Hello Haseeb, I am currently strungling to to repair a SMPS were the controller is faulty. I could not identify the part no so I ordered the xn1049 - seems to similar to sg6848..
When I switch power on, the gate output shows a burst of 45ms with a small duty cycle. In order to keep working it needs to be controlles by FB. But during startup the optpkoppler ist open und FB ist eg. 5.5V or 4.8v at sg6848. How can that work? What signal delivers gate output during the startup phase? Does it drive the Mosfet as long as FB is controlled by over output voltage? Any hint?
please check VCC pin if it have stable dc voltage or Not.
check startup resistor and aux voltage circuit (diode and resistor)
it must work.
as you mentioned it is in brust mode, that means the IC is trying to start but it fails to find auxillary voltage (on vcc pin, as vcc pin first takes from startup resistor connected on positive DC rail and vcc pin. when circuit will start switching and will recieve feedback, that time it will maintaing its freq at 65KHz) but in your case it is limiting itself at 22KHz brust mode, due to missing of feedback or vcc voltage
if feedback pin is high, that means there is something wrong in secondary side, that is most probable reason in your condition
@@HaseebElectronics I checked VCC (it comes from a standby trafo) and GND. The problem is: the original faulty part was a SMD one and it is already discontinued. So I found DIP-version and prepared a workaround. After start the new chip immedeately reduces the duty rate to the lmnit caused by current sense input. So the charging pump creates to less power to push the output to its limit and to start controlling via optocoupler. Does it makes sense to increase the switching frequency from 65kHz up to e.g. 80kHz?
May be snubber circuitry or flyback trafo ist damaged. I will check it.
@@gruneranfanger6947 wow it is awesome that it started switching
check snubber circuit
might be it have some issue
@@HaseebElectronics Snubber seems to be alright. The transformer just has 0.04mH. Is that typical for 100kHZ and 50W output?
Got it! A simple diode in the secondary side was defekt, so it reduces the induction that the referenz voltage could not reach its regulation level.
Good video
Hello sir I 'm asking many time but you are not give any answer plz sir how to calculate pq core based transformer design and if I have design any a transformer data then how to convert any transformer core data into different core I have already data for pq 3230 now it is coverted into pq2625 etc plz tell me sir
A.o.a sir im your viewer, i want to make smps with ib 2273 please make a video on ob2273 complete function
Nice
Sir👌👍👍
thanks a lot
w salam
ld7904jgp7 green mode pwm EQUIVALENT ??????
i have no idea about replacement of ld7904jgp7