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8th December 2005, 04:45 PM
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#1 |
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diyAudio Member
Join Date: Feb 2005
Location: _
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Yet another version of IR audio amp ??
Hi, to all people who are there, and willing to help me figure out some issues with this amp.
I've built pcb for 2 channel with schematic revised by pat allen and I added oc protection and those parts were altered: MURS120 is in mine desing SBYV27-200 15ns/200V irfbn23n15d -> irf640 ir2010 -> ir2110 all mm transistors are 2n as IRF suggested heatsink is electrically conected to ground. I did tested mine amp at +-25V and the main issue is that it drawns about 0.34A at +25V and 0.44A at -25V and inductors are cold, but mosfets are getting worm after 20sec not too much but . . . and frequency is 400kHz but if I try to set some lower then current drawning also drops a little bit. (0.2A and 0.3A) So I would like to hear some oppinons about this and btw I am hopeing that is not issue in mine pcb layout . . . . . |
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8th December 2005, 09:49 PM
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#6 |
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diyAudio Member
Join Date: Mar 2005
Location: Purmerend
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zkaiser,
Lets start at the beginning shall we? How about you post the schematic here so we can give that a good hard look to see whether there's some issues. I've worked with the IR driver ICs before and are intimately familiar with the IR reference design class-D amplifier. Best regards, Sander Sassen http://www.hardwareanalysis.com |
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10th December 2005, 10:04 AM
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#8 |
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diyAudio Member
Join Date: Jan 2005
Location: Sonoma, California
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IR2110 is likely too slow for switching amp application. It's a 500V HB driver therefore slower than IR2010 which is a 200V driver. Therefore get a IR2010 as in IR app note.
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Koolkid |
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11th December 2005, 10:06 AM
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#9 |
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diyAudio Member
Join Date: Feb 2005
Location: _
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Therefore I don't thinking that this cousing any trouble for now.
If you look at input of IR you will see that there are some noise that shouldn't be here and I thik that this have something with power suppling . . . here is the pic. and time base is 1us/div |
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