SemiSouth Donuts

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Choky. I'm on some physical planning here. Is it the M3 and their tailresistors that dissipates most heat or is it equal over M1, M2, M3 and their tail resistors?

And is M3s tailresistorvalue 0R135 super exact or can I go for a Caddock 0,15 if I want to HS it to get the heat out of the box?
 

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entire current is going though LTP's Tail , which M3 exactly is

so - simple calc is enough for answer

Iq x V2 is dissipation which you'll have for M3 , precise enough

in same time , voltage across 0R135 is 0V65 , so you can figure that Iq is 4A8 ........ and calc dissipation for 0R135 is trivial

as I said before - use IRFP150 in M3 position , and cool it well
 
So, if the heatsink that I plan to mount M3 on has a thermic resistance of 0,7 K/W and M3 dissipates 4,8A*10V (is that V2?)=48W my heatsinks temp will rise 0,7*48W=33,7K.

Is that correct? And is it acceptable?

Staffan
 
yup ........ and nope :clown:

just checked actual sim - Iq is 4A , so 2A + 2A

in that case , Pdiss for each of M1 and M2 is in range of 48W

again - use IRFP150N

coarse setting of Iq can be made altering value of resistor group in M3 source
 
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All 4 coils measure 21,2 H each with my LCR. Maybe I could use 2 per channel, serial all 4 primarys on input and take the plus from one trafo and the inverted from the other in serial:serial?
 
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