irs2092 schematic confirmation

philuknow · 17th July 2011, 09:48 PM

hello there i just finished my schematic and wanted to know if everything is kinda correct to finished my PCBoard.

the mosFET are irf540N
Vds 100V
Id 33A
Rds on 44mohm
trise 35ns
Qg 71nC

all diode are MUR120
Cosc and Ccomp are 1nF

output filter is left to be done.. i think im gonn put the one from typical schem.

i have put many pot for optimisation cause i had some probleme with current sensing and feedback with my breadboard attemps ( i know, i was on breadboard.. but anyway) and also to adjust the self oscillating frequency

also if you have more PCB layout considarration than AN-1138 from irf tell me please, im gonn put the pcb screenshot after comments

thx everyone !

nigelwright7557 · 17th July 2011, 10:14 PM

I would recommend a t106-2 core with 1.5 metres of 18swg enammelled copper wire for your output filter. You can get the cores on ebay or from Amidon.

philuknow · 17th July 2011, 10:22 PM

ight thanks! i've some torroidale ferrite core in my pocket right now.. when i was on breadboard i was using them and it was working not bad.. but ive no clue of what kind it is, i think im gonn buy the one you told me!

nigelwright7557 · 17th July 2011, 10:25 PM

Quote:

Originally Posted by philuknow

ight thanks! i've some torroidale ferrite core in my pocket right now.. when i was on breadboard i was using them and it was working not bad.. but ive no clue of what kind it is, i think im gonn buy the one you told me!

On my first attempt at a 2092 layout I naively just bought a power inductor. This got very hot, about 120 degrees ! Power inductors are not meant for class d.
The t106-2 is the proper core and doesnt get hot at all.

philuknow · 17th July 2011, 10:26 PM

haha u convince me ! i remember that my inductor in my proto was heating as hell too..

philuknow · 18th July 2011, 12:32 AM

also.. the irf540's Qg is much higher then the irf6645 they use.. Rds on also is a little higher.. any recommandation to reduce false triggering of the OCS ?

luka · 19th July 2011, 06:39 AM

why is CSD left without cap?

philuknow · 19th July 2011, 05:12 PM

there's one.. beside with the amp op! i wanted to have a low impedance output for monitoring..

philuknow · 19th July 2011, 05:13 PM

any other suggestion ???

luka · 19th July 2011, 06:41 PM

Looks good, I think its all good. just make sure you have "unlimited" 12v source, since at higher freq. to drive those fets you will need "bigger" amount of current for gate driver. also thing about using gate buffers, irs will thank you

17th July 2011, 10:14 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I would recommend a t106-2 core with 1.5 metres of 18swg enammelled copper wire for your output filter. You can get the cores on ebay or from Amidon. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

19th July 2011, 06:39 AM	#7
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	why is CSD left without cap? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

19th July 2011, 06:41 PM	#10
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	Looks good, I think its all good. just make sure you have "unlimited" 12v source, since at higher freq. to drive those fets you will need "bigger" amount of current for gate driver. also thing about using gate buffers, irs will thank you __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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17th July 2011, 10:22 PM	#3
philuknow diyAudio Member Join Date: Feb 2009	ight thanks! i've some torroidale ferrite core in my pocket right now.. when i was on breadboard i was using them and it was working not bad.. but ive no clue of what kind it is, i think im gonn buy the one you told me!

17th July 2011, 10:26 PM	#5
philuknow diyAudio Member Join Date: Feb 2009	haha u convince me ! i remember that my inductor in my proto was heating as hell too..

18th July 2011, 12:32 AM	#6
philuknow diyAudio Member Join Date: Feb 2009	also.. the irf540's Qg is much higher then the irf6645 they use.. Rds on also is a little higher.. any recommandation to reduce false triggering of the OCS ?

19th July 2011, 05:12 PM	#8
philuknow diyAudio Member Join Date: Feb 2009	there's one.. beside with the amp op! i wanted to have a low impedance output for monitoring..

19th July 2011, 05:13 PM	#9
philuknow diyAudio Member Join Date: Feb 2009	any other suggestion ???

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