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Class D Switching Power Amplifiers and Power D/A conversion

TPA3251d2
TPA3251d2
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Old 2nd August 2015, 06:02 PM   #101
doctormord is offline doctormord  Germany
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You probably will, but will i.. ?
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Old 2nd August 2015, 08:33 PM   #102
29285 is offline 29285  Europe
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Originally Posted by doctormord View Post
You probably will, but will i.. ?
Considering the price of such inductors I guess you will not!
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Old 2nd August 2015, 09:14 PM   #103
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by 5th element View Post
It just looks like any run of the mill single chip class D amp. Yeah it's got spread spectrum switching but in any hifi application you'll be using an output filter anyway.
Would you please name some "non run of the mill", higher caliber class D chips? Or are you implying that all class D chips are "so-so"? Thank you in advance for clarifying.

Regards,
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Old 3rd August 2015, 01:24 AM   #104
doctormord is offline doctormord  Germany
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Pretty much "final".
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Old 3rd August 2015, 01:54 PM   #105
Lo_Tse is offline Lo_Tse  Canada
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Originally Posted by doctormord View Post
Pretty much "final".
Looks really nice!!
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Old 3rd August 2015, 02:18 PM   #106
doctormord is offline doctormord  Germany
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Finally ordered the first batch.
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Old 7th August 2015, 02:09 AM   #107
gmarsh is offline gmarsh  Canada
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I'm a few days behind doctormord but my layout is done.

Click the image to open in full size.

Since the TPA3251D2 chip is codenamed Akita, I figured I'd name this card the Hachiko after the famous akita dog..

Still got some other things to do (PBTL Wiener PCBs should arrive here any day now..) but I'll get this card ordered soon and build 'er up. Got samples of the TPA and DC/DC now.
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Old 7th August 2015, 02:15 AM   #108
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by gmarsh View Post
I'm a few days behind doctormord but my layout is done.

Click the image to open in full size.

Since the TPA3251D2 chip is codenamed Akita, I figured I'd name this card the Hachiko after the famous akita dog..

Still got some other things to do (PBTL Wiener PCBs should arrive here any day now..) but I'll get this card ordered soon and build 'er up. Got samples of the TPA and DC/DC now.
Looking forward to your build. BTW, What inductors do you have in mind for this board?

Regards,
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Old 7th August 2015, 03:17 AM   #109
gmarsh is offline gmarsh  Canada
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Right now Coilcraft VER2923. ICE Components 1D17A will also fit the card, lots of saturation margin with it too. You're pushing its RMS current rating if you drive a 4 ohm load hard with the amp, but playing back real music it should work pretty well.

Haven't done an exhaustive search through the Wurth/etc catalogs for other alternatives. Usually a L versus current curve is buried deep in the PDFs and going through datasheets one by one gets tiring after a while.
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Old 7th August 2015, 08:04 AM   #110
doctormord is offline doctormord  Germany
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My calculation tells me, your U profile heatsink will
be no better than 9W/K, what did you calculated?

Last edited by doctormord; 7th August 2015 at 08:09 AM.
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