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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th December 2015, 07:21 PM   #501
gmarsh is offline gmarsh  Canada
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If you're driving BTL loads, syncing two chips 90 degrees out of phase makes more sense doesn't it?

Got some free time again, time to finally get this heatsink thing figured out and finish my card.

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Old 6th December 2015, 08:03 PM   #502
doctormord is offline doctormord  Germany
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Yay, and don't forget my birthday present.
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Old 6th December 2015, 08:34 PM   #503
5th element is offline 5th element  United Kingdom
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Originally Posted by gmarsh View Post
If you're driving BTL loads, syncing two chips 90 degrees out of phase makes more sense doesn't it?

Got some free time again, time to finally get this heatsink thing figured out and finish my card.

Sent from my Nexus 4 using Tapatalk
The power being delivered to the load, ie the audio signal, is completely different to the square wave switching of the chip itself. As far as I am aware all four channels switch together and are synchronous to one common oscillator.

When you wire up a slave with reversed clock polarity it means that as one chips output stage (say the masters) is switching off the others (thee slave) is switching on. Meaning there is always one chip on and one off, rather than both on and both off at the same time.
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Old 6th December 2015, 10:19 PM   #504
mikey_audiogeek is offline mikey_audiogeek  New Zealand
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Work in progress, the "shrink mod".

Baseboard will be 60*60mm to fit in an enclosure, front panel will be an optional brake-away.
Nice! How do I order?

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Old 6th December 2015, 11:40 PM   #505
29285 is offline 29285  Europe
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I used an lm46002 for its supposedly decent emi performance! Providing the layout is good.
Did you check them with a mobile phone?
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Old 7th December 2015, 12:24 AM   #506
doctormord is offline doctormord  Germany
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Nice! How do I order?

Cheers,
Mike
Will let you know when i'm on the finish line. It's actually a pretty tight fit.

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Did you check them with a mobile phone?
+1
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Old 7th December 2015, 01:49 AM   #507
5th element is offline 5th element  United Kingdom
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How exactly are you supposed to check it with a mobile phone?
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Old 7th December 2015, 03:14 AM   #508
infinia is offline infinia  United States
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How exactly are you supposed to check it with a mobile phone?
dial 1-800-EMI-HOME and see if it answers.
I heard of using small AM broadcast radio before, but this is the millennial (milleurista) solution in the makings*

everything is fine as long as their smart phone and Wi-fi isn't affected
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Last edited by infinia; 7th December 2015 at 03:32 AM.
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Old 7th December 2015, 09:18 AM   #509
doctormord is offline doctormord  Germany
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Funny guy you are..
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Old 7th December 2015, 11:07 AM   #510
doctormord is offline doctormord  Germany
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Edit: The point is having your mobile coupling into the circuit rather than your switcher degrades phones performance.
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