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Class D Switching Power Amplifiers and Power D/A conversion

A masterpiece A-brick
A masterpiece A-brick
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Old 22nd March 2016, 06:35 PM   #1
peranders is offline peranders  Sweden
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Mr. Boström (Anaview), Sweden has designed a very neat class D module, don't think.


Specifications
http://www.a-bricks.com/wp-content/u...B101_1-pa1.pdf
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Last edited by peranders; 22nd March 2016 at 06:38 PM.
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Old 23rd March 2016, 05:30 AM   #2
dudaindc is offline dudaindc  United States
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Wow - this is pretty cool...!
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Old 23rd March 2016, 12:11 PM   #3
xrk971 is offline xrk971  United States
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That is a very high power density for how small that amp is at 50mm x 30mm. It is bigger than the photo in the PDF makes it look - by far that is the biggest inductor on the smallest amp. Looks like a self oscillation type circuit similar to IRS2092 except with feedback after the inductor. I wonder what honey sell for?

From CES booth - you can see once integrated into a motherboard with requisite filtering, dual rail supply, logic etc, the size is not any smaller than an equivalent 400w stereo LJM IRS2092.

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Old 23rd March 2016, 04:29 PM   #4
doctormord is offline doctormord  Germany
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Would be interesting how they achieve 3mR output impedance from using two Infineon BSC360N15NS3 G FETs.
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Old 23rd March 2016, 04:40 PM   #5
bwaslo is offline bwaslo  United States
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Quote:
Originally Posted by doctormord View Post
Would be interesting how they achieve 3mR output impedance from using two Infineon BSC360N15NS3 G FETs.
Negative feedback
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Old 23rd March 2016, 05:36 PM   #6
Nisbeth is online now Nisbeth  Denmark
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Seems to require five supply rails as well which I guess more or less demands a dedicated SMPS?

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Old 23rd March 2016, 10:19 PM   #7
Jensen567 is offline Jensen567  United States
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The supply rails does make implementation a bit complicated. Would love to play with one anyway! Wonder how much they will sell for.
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Old 24th March 2016, 04:33 AM   #8
xrk971 is offline xrk971  United States
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That's not that small if you look at what a +/-44v rail class AB can look like (built by member borys):

http://www.diyaudio.com/forums/solid...-here-458.html

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Click the image to open in full size.

P=44v^2/4ohms=484w
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Old 24th March 2016, 05:39 AM   #9
bwaslo is offline bwaslo  United States
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I think you have to divide by TWICE the load impedance (since the relevant voltage is RMS, not the peak value --> RMS^2 = 0.5xPEAK^2, and peak is limited or at best defined by the power supply rail).
So --- 242W.
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Old 24th March 2016, 06:26 AM   #10
xrk971 is offline xrk971  United States
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Thanks - But what about the fact that it is a +/- 44v or 88v p-p?
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