Amazing tutorial on this subject. When I was doing electronics at Uni, we weren't taught this, naturally. We were just left to our devices and taught about all the different component. Now when I'm out of Uni and starting to build my own projects, I start encountering way more variables to account for in my circuit. This helped a lot. Thanks
It is very nice explanation on all calculation and useful. do you have a template to do all calculations by inputs all necessary parameters? I like to get a copy if possible
Is the ambient taken as the room temperature? Or is it taken as the temperature very very close to the case? I ask because I'm not getting the same values for the junction temperature when I calculate going from case to junction, and from ambient to junction. I measure the case temp of my component after it's hooked up to the circuit for a long time. I also measure the room temperature. Then I do the two calculations for the junction temperature both ways (J-A and J-C) and I get a 30 degree difference (Celsius) between the two calculations for the junction temperature
sometimes there is for example " 14K / W" but I suppose K here doesn't mean kelvin ? I don't get why sometimes they give you information in celsius and sometimes in K per W ??
How do the calculations change if you are placing multiple devices on a single heat sink? I can assume that transistors in parallel will allow the total electrical watts to be divided by number of devices, however what maths needs to be done to recalculate junction to ambient? I would appreciate it if you someone could answer this as im trying to work out my heat sink /transistor arrangements for my TIP3055 devices I’m dissipating 360 watts total, with basing my calculations with an ambient temp of 35, and a maximum junction temp of 50C Heatsink can run as hot as it wants, but junction needs to remain 50-70C per device JC for TIP3055 is 1.39CW Case to sink assumes 2CW Max Tj = 150C Power dissipation = 90 watts per degree C at 25 3 x heat sinks, each having a thermal conductivity of 0.367CW So this is what I found Rth j-a = Jc/ number of devices + c-s + s-a Rth j-a = 1.39/4 + 2 + 0.367 Rth j-a = 2.8CW Right or wrong? Based on 4 TIP3055’s on 1 heatsink Total of 12 on 3 sinks 360W/ 12 = 30W per device Tj = 2.8 x 30W + 30C amb Tj = 114C One 120W TIP3055 heatsink module, with a Tj of 114C per transistor dissipating 120W Can anyone advise better? Thanks 🙏
I'm calculating mine. With 2amps and 12vin 5v out= 14w power dissipation. With 2c/w heat resistance on junction to case. 45celciuc outside temperature a d 125c max temperature for junction. I get 1.71c/w for heat sink. Is that a reasonable value?
How do you measure the temperature on those devices if you don't have all that data? They are so small. Besides, you are not supposed to mount your thermocouples to plastic case (you don't know the temperature resistance of this plastic)...
Hello sir, can you please make a video on calculating thermal resistance of COMMON heat sink for 3 different IGBTs. (Assume that we have to design a common heat sink for IGBT1, IGBT2, IGBT3 having different values of Tjmax.
Thanks for your step by step explanation. one question how come case to sink temperature decided as 2? is that assumption value? your feedback helps. Thank you!
The best explanation ever about heatsink calculator. THANK YOU !!!
Amazing tutorial on this subject. When I was doing electronics at Uni, we weren't taught this, naturally. We were just left to our devices and taught about all the different component. Now when I'm out of Uni and starting to build my own projects, I start encountering way more variables to account for in my circuit. This helped a lot. Thanks
A clear picture of heat sink design overall. Well done Sir!
Thank you for presenting this video. I often refer to it as a refresher and it's very easy to understand the calculations required.
SUPER helpful for a beginner like myself. Thank you.
Absoloutely EXCELLENT video with thorough detail. Earned a subscriber.
Thanks a lot. This made everything a bunch more easy!
Thanks for this video. That was a neat explanation.
hallo from germany...i'm a student right now and want to thank you for video it helps me alot...thanks
Excellent demonstration Sir
thx a lot, I'm Belgian guy, it was very easy to understand
Excellent tutorial!
Excellent explanation! Great work.
Perfect explanation. Thank you very much.
Very good explanation. Thanks from India
Best hands down. Makes perfect sense.👏
It is very nice explanation on all calculation and useful. do you have a template to do all calculations by inputs all necessary parameters? I like to get a copy if possible
Thanks for the detailed explanation.
Excellent explanation. great work.
Thanks sir for your explanation.Its very useful for me
How did you select thermal resistance Rcs (resistance case to sink value 2)?because in data sheet is just junction to case.
Is the ambient taken as the room temperature? Or is it taken as the temperature very very close to the case?
I ask because I'm not getting the same values for the junction temperature when I calculate going from case to junction, and from ambient to junction. I measure the case temp of my component after it's hooked up to the circuit for a long time. I also measure the room temperature. Then I do the two calculations for the junction temperature both ways (J-A and J-C) and I get a 30 degree difference (Celsius) between the two calculations for the junction temperature
STRAIGHT TO THE POINT CLEAR EXPLANATION WITHOUT THE ANNOYING BACKGROUND MUSIC.
Great video!!! Thank you very much.
Thank you so much. This helped me a lot.
sometimes there is for example " 14K / W" but I suppose K here doesn't mean kelvin ? I don't get why sometimes they give you information in celsius and sometimes in K per W ??
But my data sheet doesn't show the resistance junction to ambient value?
How do the calculations change if you are placing multiple devices on a single heat sink?
I can assume that transistors in parallel will allow the total electrical watts to be divided by number of devices, however what maths needs to be done to recalculate junction to ambient?
I would appreciate it if you someone could answer this as im trying to work out my heat sink /transistor arrangements for my
TIP3055 devices
I’m dissipating 360 watts total, with basing my calculations with an ambient temp of 35, and a maximum junction temp of 50C
Heatsink can run as hot as it wants, but junction needs to remain 50-70C per device
JC for TIP3055 is 1.39CW
Case to sink assumes 2CW
Max Tj = 150C
Power dissipation = 90 watts per degree C at 25
3 x heat sinks, each having a thermal conductivity of 0.367CW
So this is what I found
Rth j-a = Jc/ number of devices + c-s + s-a
Rth j-a = 1.39/4 + 2 + 0.367
Rth j-a = 2.8CW
Right or wrong?
Based on 4 TIP3055’s on 1 heatsink
Total of 12 on 3 sinks
360W/ 12 = 30W per device
Tj = 2.8 x 30W + 30C amb
Tj = 114C
One 120W TIP3055 heatsink module, with a Tj of 114C per transistor dissipating 120W
Can anyone advise better?
Thanks 🙏
thank you for insight. Sir how to calculate thermal resistance of heatsink if it is unknown?
Excellent video.
I'm calculating mine. With 2amps and 12vin 5v out= 14w power dissipation. With 2c/w heat resistance on junction to case. 45celciuc outside temperature a d 125c max temperature for junction. I get 1.71c/w for heat sink. Is that a reasonable value?
Thank You
How do you measure the temperature on those devices if you don't have all that data? They are so small. Besides, you are not supposed to mount your thermocouples to plastic case (you don't know the temperature resistance of this plastic)...
Hello sir, can you please make a video on calculating thermal resistance of COMMON heat sink for 3 different IGBTs.
(Assume that we have to design a common heat sink for IGBT1, IGBT2, IGBT3 having different values of Tjmax.
Thanks for your step by step explanation. one question how come case to sink temperature decided as 2? is that assumption value? your feedback helps. Thank you!
rajasekar a
Please let ms know why you have taken delta cs as 2. Any explanation
In the video he says that 2 is the worst case scenario. It should be that or less.
You neglected the "quiescent current" of the regulator. There will be additional power which is Vin(9V) times the "quiescent current".
excellent!
why case to sink is 2? i don't see it
T = 2mm
Tekrar seyret
sillicon pad, mica+paste, or metal to metal with paste.......... fight!
Too slow and too much repetition; but, other than that it's okay!