IR2113 blowing ! help needed...

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andrewlebon

andrewlebon

R.I.P.
Joined 2008
BETTER LATE THAN NEVER

HI
greetings at last managed to make amp work using IRFN250 supply
voltage 50 0 50 dc just some pics
warm regards
andrew lebon
 

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andrewlebon

andrewlebon

R.I.P.
Joined 2008
Hi Abeteer
greetings all files can be found onthis ucd thread just stick TO orignal pcb by
egtagle THE SMALLER PCB you wont go wrong if you start your construction in a
logical way i found out the hard way see when i started this thread and when i managed
finally to make it work but better late than never check all parts before soldering and for shorts on copper side correct orientation of caps and DIODES
warm regards
andrew lebon
 
de Ocampo

de Ocampo

Member
Joined 2010
Hi Luka!

I saw your work on Elektor mains delay circuit, I built the same using the PCB lay from Elektor but I could not properly fit those bigger wirewounds so it looks like "out of nowhere" build :( I wonder if you have done a modified lay-out on your PCB, the wirewounds was nicely arranged. Will you be sharing the files?

Regards!

[Sorry...I'm off topic]
 
luka

luka

Member
Joined 2005
classdaudio.eu
abeteer said:
Hi Luka!

I saw your work on Elektor mains delay circuit, I built the same using the PCB lay from Elektor but I could not properly fit those bigger wirewounds so it looks like "out of nowhere" build :( I wonder if you have done a modified lay-out on your PCB, the wirewounds was nicely arranged. Will you be sharing the files?

Regards!

[Sorry...I'm off topic]
Click to expand...
I'm also sorry for off topic, but to answer.. yes, I did my own board from the begining, and the reason why everything just fits
I will look what I have, you'll get the PCB from my site, I guess I didn't put it up there yet, so I'll look into it and make sure, it will be there in a day or two (not at home today)

There is one thing, I need those big resistors only once, when I guess I wanted to power dead short, and only that time those resistors got hot, there was about 230w on them for few seconds, 2w would in any other situation work just fine
 
S

stijena1973

Member
Joined 2012
alexclaire said:
Hi Fredos,

my coil is T106-2 core ordered from USA and 63 turns = 54uH that's the material you advice for switching amp isn't it ?
When you tell a bigger cap you mean 680n or 1u ?
= decrease cut off frequency of the output filter to minimize ripple at the output , that's it ?

Yeah ! the sound is great bass are deep and high are very clear...
very surprised of the result on a single sided board.
No real life high power test : only small jbl at home ;-) .
Thanks a lot.
The next step is overload protection setup...
Learning a lot about class d amp.
just a bit affraid to push it to clipping (bad experience before : 4 fets and 2 drivers blown...).
do you think duty cycle limiter is necessary to avoid clipping ?

Alexis.
Click to expand...


Try air cored coil from one of Your speaker crossovers. It will heat itself a little, depending on DC resistance, but it will never go into saturation. Then try to use 5 100nF foil capacitors instead of one 470nf. Smaller capacitors have bigger specific ripple current allowed. also decouple PS not only + to - but also to the cold side of the filter capacitor, using also several smaller capacitors. Reduce loop area of those decoupling networks by tight mounting. Forget the PCB, use spider web technique..., all in the air, but with short and fat connections.
 
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