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Old 13th November 2009, 12:10 AM   #1
SS64 is offline SS64  United States
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Default Class D parts help

Ok Have this generic style class on the bench today.. came in with one blown output and a fried supply.. The supply is no big. Going to use 3205's and switch the gate resistors to 10 ohms. Here's my problem I just want to replace the one bad output without replacing them all.. the part I'm looking for is a RFP40N10.. Mouser shows them as obsolete. Future doesnt show the TO-220 stlye and Ebay wats over $8 a piece!
It being a class D i know it can be one finicky sob.. Should/ can I just replace them all with something else? Or does anyone here have one they want to part with for some $..??
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Old 13th November 2009, 12:24 AM   #2
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The IRF3710Z (note the Z suffix) is often a good sub in the HIP4080 based amps. The IRF3710ZPBF is essentially the same part but lead free.

I'd recommend that you replace all of them. If the power supply didn't fail, it could well fail if the outputs fail again. The remaining outputs were likely pushed right to the point of failure also but the one that failed caused the amp to shut down or blow the fuse.

There's no point in trying to save a few bucks and risk having the amp fail.
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Old 13th November 2009, 12:31 AM   #3
SS64 is offline SS64  United States
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OK thanks perry.. This poor thing doesnt even have a name on it anymore.. And the board says nothing but d2000.. Did some searching but came up with nothing useful.. I always replace ALL the power supplys.. its cheap insurance on my end.. Would a picture help on determining if those outputs will work?
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Old 13th November 2009, 12:39 AM   #4
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If it uses the 4080, they 'should' work (I've had good luck with them).

A photo wouldn't help to determine if they will work (assuming it's using the 4080) but I (or someone else here) may recognize the amp and be able to tell you what it is.
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Old 13th November 2009, 12:41 AM   #5
SS64 is offline SS64  United States
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ok not to sound totally stupid but when you say 4080 what do you mean..?? this amp still uses a 494 in the supply..
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Old 13th November 2009, 12:48 AM   #6
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HIP4080 = 20pin driver IC used in the class D audio section of the amp, normally installed in a socket.
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Old 13th November 2009, 12:51 AM   #7
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ok thanks.. started to think more about it and thought that might be what you meant.. I'll look tomorrow. thank you again Perry..
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Old 13th November 2009, 12:20 PM   #8
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IRF3710Z is a very good replacement but gate charge is substantially lower (resulting in much faster turn on) so the value of gate resistors may have to be doubled (but only for turn on, not for turn off, so look for turn off diodes...) Faster turn off is not usually a problem.
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Old 14th November 2009, 03:33 AM   #9
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Ok..the turn off diodes are located where? Gate res. are no problem.. And I ordered the parts today so hopefully next week i will get this thing done and out of my hair..
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Old 14th November 2009, 03:41 AM   #10
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Did you ever take any photos of the amp?

Don't change anything unless there is a problem. In all of the amps I've used them in, they were a drop-in replacement.
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