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Old 17th April 2013, 05:17 AM   #21
EUVL is offline EUVL  Europe
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F5X -- the EUVL Approach


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Old 17th April 2013, 06:40 PM   #22
ra7 is offline ra7  United States
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That was very helpful, Papa. Thanks! I like your other rule of thumb also: you should be able to keep your fingers on the heatsink for 10 seconds.
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Old 23rd April 2016, 12:53 PM   #23
el_mariachi is offline el_mariachi  Norway
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Quote:
Originally Posted by albertNL View Post
I am sorry, but it is late and I am lost.

Tj = W * (Rj + Rc + Rh) + Ta
Tj = 16 * (1 + 1 + 2) + 25
Tj = 16 * 4 + 25
Tj = 64 + 25
Tj = 89

Where did 116 come from?
I know this is an old thread but i also find this confusing.
Maybe someone could explain a little further.
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Old 23rd April 2016, 02:40 PM   #24
diy_audio_fo is offline diy_audio_fo  Italy
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Quote:
Originally Posted by el_mariachi View Post
I know this is an old thread but i also find this confusing.
Maybe someone could explain a little further.
You can model the thermal circuit as an electrical circuit [Thermal unit = Electrical unit]:

Thermal resistance (Rth) = R
Power (W)= I
Temperature (T)= V

From Ohm's law

V = I * R
T = W * Rth

https://en.wikipedia.org/wiki/Thermal_resistance
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Old 23rd April 2016, 03:19 PM   #25
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by el_mariachi View Post
I know this is an old thread but i also find this confusing.
Maybe someone could explain a little further.
Most likely a simple mistake
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Old 23rd April 2016, 06:14 PM   #26
Nelson Pass is offline Nelson Pass  United States
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Yes, should have been +25, and old calculator.

(me)

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Old 23rd April 2016, 07:56 PM   #27
Zen Mod is offline Zen Mod  Serbia
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yup

but even with + instead of - , it can't be 116

however , what's small typo between friends ....... logic is what counts
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Old 23rd April 2016, 08:01 PM   #28
Gyuri is offline Gyuri  Hungary
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Papa just put to the test us.
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Old 23rd April 2016, 08:13 PM   #29
Zen Mod is offline Zen Mod  Serbia
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even if flawless - when making amps ,he's deadly serious ..... in same amount as Kung Fu Panda



however , when numbers and words are in case , ya better read between the lines
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Old 23rd April 2016, 08:18 PM   #30
Zen Mod is offline Zen Mod  Serbia
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I found Da Logic :

Tj = W * (Rj + Rc + Rh) + Ta
Tj = 16 * (1 + 1 + 2) + 25
Tj = 16 * 4 + 25
Tj = 64 + 25
Tj = 89

now , just add 42

so

Tj= 89+42
Tj= 116

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