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Old 17th March 2011, 12:41 AM   #11
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Originally Posted by Devendra View Post
Hi,

I am trying to make a class-D amp,using IRS2092(S) and IRF6655 for my term here, and I am quite stuck at getting the amp to start working!
Thanks

Devendra
The irs2092 can be a minefield for those new to class d.

Decoupling is vital, not just around the 2092 but also around the mosfets b+/b- b+/gnd b-/gnd with 100nf. Care must be taken with the 12 volt vcc rail, I had noise on mine causing the 2092 to reset. I used a 100uf on this rail.

I found that I had trouble getting it to run with a 22uH inductor, I found a 30uh worked much better with less resetting on hard clipping.

Just to add to the fun I found some 2092's were susceptible to resetting while others werent even on the same pcb.

I found some got upset with hard clipping inputs and this was cured with a couple of 4v7 zeners across the analogue input.
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Old 17th March 2011, 09:10 AM   #12
luka is offline luka  Slovenia
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You didn't use RC low pass filter in feedback, I did
Why do you have R18?
Also lower value are recomended for settings of IRS, there has to be some min current going via those resistors, at least 0.5mA for OCSET you have a lot less then that.
You have 45ns dead time, which is fine, but not what you resistors say (measured compared to gnd won't work here)

VAA and VSS can't be more then +/-6v, I used 5.1v zeners, and you have +/-7V (IC could be damaged already)
Vref is 5.1v compared to -Vcc, yours seems to be a lot higher
OCSET being -20V out of -25 V is totaly wrong, 5v is a little less then half of 12V (BTW you really should re-measure everything since most things are compared to -Vcc, like OCSET, Vref, DT,... and some to gnd, as in Vaa and Vss, CSD)
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Last edited by luka; 17th March 2011 at 09:21 AM.
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