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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th December 2005, 04:45 PM   #1
zkaiser is offline zkaiser  Yugoslavia
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Question 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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Old 8th December 2005, 06:12 PM   #2
zkaiser is offline zkaiser  Yugoslavia
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More details
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Old 8th December 2005, 06:12 PM   #3
zkaiser is offline zkaiser  Yugoslavia
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And of course opamp detail . . .
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Old 8th December 2005, 07:43 PM   #4
lkadar is offline lkadar  Hungary
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Hi!

Very nice board, very nice layout. Congratulations...
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Old 8th December 2005, 09:32 PM   #5
zkaiser is offline zkaiser  Yugoslavia
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too bad that doesn't work right, for now!!!
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Old 8th December 2005, 09:49 PM   #6
SSassen is offline SSassen  Netherlands
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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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Old 9th December 2005, 06:06 PM   #7
zkaiser is offline zkaiser  Yugoslavia
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Ok. Here is mine sch, so if anyone have something to say well I am hearing. . .
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Old 10th December 2005, 10:04 AM   #8
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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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Old 11th December 2005, 10:06 AM   #9
zkaiser is offline zkaiser  Yugoslavia
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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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Old 11th December 2005, 10:08 AM   #10
zkaiser is offline zkaiser  Yugoslavia
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here are signals on gates, time base also 1us/div
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