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Class D Switching Power Amplifiers and Power D/A conversion

IRS2092 Recent Failures
IRS2092 Recent Failures
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Old 7th January 2019, 09:05 PM   #1
schauvin is offline schauvin
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Default IRS2092 Recent Failures

We have been building a specialized version of the IR IRS2092PBF amplifier for about four years without much issue. Last October, we began having a high failure rate of the IRFB4019 FETs. Thinking that we might have gotten a bad batch, I sourced 3500 pieces from each of two of our suppliers one morning, but by evening, they were all gone. We were able to locate 75 pieces but had to wait about 2 months before any showed up in distribution.



Changing the FETs appeared to resolve the issue for a while, but then we began having a higher than normal failure rate for the flyback diodes.


I suspect that it MAY have some relation to IR selling out to Infineon (China).


Has anyone else experienced this issue?
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Old 7th January 2019, 09:20 PM   #2
Khron is online now Khron  Finland
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I thought Infineon were German.
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Old 8th January 2019, 03:14 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I got caught out with some irfp4227's cheap from China.
They blew up very easily.
So I got some from RS and never had any problems after that.

Could be the mosfets have a wider spread on characteristics now and maybe you are getting shoot through which blows them up ?

Noise on the rails could cause a problem, make sure the rails are well decoupled.

I bought in some cheap transistors and the first time I unplugged my soldering iron the glitch on the mains blew them up.
Again, bought some from RS and couldn't blow them up despite trying very hard.
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Old 8th January 2019, 02:35 PM   #4
schauvin is offline schauvin
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Quote:
Originally Posted by nigelwright7557 View Post
So I got some from RS and never had any problems after that.

Is RS a distributor in the UK or a manufacturer? It appears that the irfp4227s are only manufactured by IR(which is now Infineon out of China).

Quote:
Originally Posted by nigelwright7557 View Post
I bought in some cheap transistors and the first time I unplugged my soldering iron the glitch on the mains blew them up.
Again, bought some from RS and couldn't blow them up despite trying very hard.

DANG!!! Those are some SENSITIVE transistors! Either that or your supply filters are very bad.
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Old 8th January 2019, 05:29 PM   #5
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by schauvin View Post

DANG!!! Those are some SENSITIVE transistors! Either that or your supply filters are very bad.

Like Mouser, Digikey, Avnet... RS is a reputable distributor.


There is a plethora of possible failure mechanisms we only can guess. Nigels experience just gives a hint of poor ruggedness in an unknown environment.
just my 2c
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Old 17th January 2019, 09:15 PM   #6
schauvin is offline schauvin
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nigelwright7557,



Based on some of your other posts on the subject of Class D amps and particularly IRS2092-based amps, it sounds like you have some experience with these.


Are you using your own layouts?


Have you tried any of the inexpensive IRS2092 500w mono channel boards found on the internet which look like this...
IRS2092 Recent Failures-61pkw2mkrrl-_ac_ul436_-jpg


Thanks
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