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Old 1st June 2011, 11:05 PM   #21
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Originally Posted by student_sound View Post
i bought some irfb4227, irf640 and t_130-2 my power supply is +/- 63v , R gate driver 10 ohms . is it okie ? last time, i test my design in break board it resets when clip like yr .maybe pin ocset or DC protect works not right ,have u fix your amps ?
i hope my amps 7 works good .
philip .
Regard !
The resetting when hard clipping is an odd problem.
I found substituting another 2092 often fixed the problem.
Found the same with the crack through speaker on power off.

To stop the resetting when hard clipping try putting limiter zeners back to back on the front end to limit voltage excursion. Put a resistor in series so the zeners arent overloaded.
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Old 2nd June 2011, 01:56 AM   #22
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Default Thanks for your reply Nigelwright7557 !

i will fix that when my pcb ready ....
regard !
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Old 2nd June 2011, 02:25 AM   #23
dewardh is offline dewardh  United States
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Have you compared your design and layout to either the reference board or the classDaudio SMD version of it? Since neither of them exhibit the problems you're having that might be a good place to start to find your mistake . . .
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Old 2nd June 2011, 07:43 PM   #24
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Have you compared your design and layout to either the reference board or the classDaudio SMD version of it? Since neither of them exhibit the problems you're having that might be a good place to start to find your mistake . . .
Seems odd some chips do it but others dont.
It seems hard to get consistency with the irs2092.
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Old 2nd June 2011, 10:42 PM   #25
dewardh is offline dewardh  United States
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Originally Posted by nigelwright7557 View Post
Seems odd some chips do it but others dont.
It seems hard to get consistency with the irs2092.
I haven't seen reports of any chips doing it on either the reference board or the clasDaudio boards. Have you tried the chips you're having "problems" with using the reference design?
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Old 2nd June 2011, 10:49 PM   #26
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I haven't seen reports of any chips doing it on either the reference board or the clasDaudio boards. Have you tried the chips you're having "problems" with using the reference design?
I dont have access to the reference board.

The crack through the loudspeaker on power down is just silly, the 2092 is supposed to have anti click/pop circuitry in it.

As for resetting during hard clipping then perhaps I am just forcing too many volts into the input and upsetting the 2092 ? I do know of one other person who had the same problem but like me it was hard clipping. During normal use it is fine.
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Old 3rd June 2011, 05:50 AM   #27
dewardh is offline dewardh  United States
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I dont have access to the reference board.

The crack through the loudspeaker on power down is just silly,
The reference design is published, including board layout. The "crack" could be a number of things but I'd guess that you've got the low voltage regulator wrong somehow . . .
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Old 3rd June 2011, 08:43 PM   #28
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The reference design is published, including board layout. The "crack" could be a number of things but I'd guess that you've got the low voltage regulator wrong somehow . . .
I did have some problems with the low voltage regulator with spikes on the supply. This caused spikes on the audio out. I fixed this with a 100nf right next to the regulator and a 100uf right next to the 2092.
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Old 4th June 2011, 06:29 PM   #29
dewardh is offline dewardh  United States
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I did have some problems with the low voltage regulator with spikes on the supply. This caused spikes on the audio out. I fixed this with a 100nf right next to the regulator and a 100uf right next to the 2092.
That's . . . odd . . . what caused the "spike" problem? What's the UVP trigger voltage, and is it working (idle question . . . obviously it's not or you wouldn't get shutdown noise)?
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Old 4th June 2011, 07:09 PM   #30
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for what I can tell, only shutdown noise you get is if your supply for fets falls before main goes low enough
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