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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th October 2009, 10:20 PM   #1
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Default Audiom | 100-W audio amp is 20 times more efficient than Class D chips

Thought somebody may be interested in this:

http://www2.electronicproducts.com/1...009.html.aspx#
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Old 5th October 2009, 10:36 PM   #2
mlloyd1 is offline mlloyd1  United States
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100w peak from 1.5v supply?
i thought this was october ...
(vs. april)

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Old 6th October 2009, 12:28 AM   #3
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20 times more efficient? Gee, worst-case class-D is 70% efficient, so this thing must be 1400% efficient! Call the Nobel Prize committee, we've discovered the secret of endless power!

That's what happens when you let the marketing pukes put out a press release before the engineers fact-check it.
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Old 6th October 2009, 12:32 AM   #4
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someone should tell them that they haven't released a title with high peak-to-average-power ratio in almost 30years.
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Old 6th October 2009, 01:14 AM   #5
stoc005 is offline stoc005  United States
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Default I'll wait for the one powered by interstellar ether.

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Old 6th October 2009, 01:31 AM   #6
star882 is offline star882  United States
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Is it hybrid or pure digital? Not that it matters as it appears to be vaporware and not smugware...
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Old 6th October 2009, 01:38 AM   #7
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No, I think it's a real chip. From what I can gather it's a class D driver chip with an on-board look-ahead SMPS. The SMPS steps up the 1.5V to whatever rails are needed by the class D amp to output the signal and then the class D drivers have their losses minimized by only switching the voltage needed (rather than required full power rails) and also due to longer on-times. All the power devices are off chip. This is just a controller.

I'm sure it's really good for a wristwatch boom box but that 100W spec has some very specific conditions on it. It sure as hell ain't gonna run no 15" subwoofer off a AA battery.
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Old 6th October 2009, 01:44 AM   #8
cbdb is offline cbdb  Canada
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They could increase the voltage out with a switching reg type cct (isnt this what class D is) (12v car amps can put out 1000w) but which pin is the 100amps going thru?
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Old 6th October 2009, 03:18 AM   #9
DjLeco is offline DjLeco  Romania
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Quote:
Originally Posted by cbdb View Post
They could increase the voltage out with a switching reg type cct (isnt this what class D is) (12v car amps can put out 1000w) but which pin is the 100amps going thru?
They talk about "small batteries", wich cannot offer 100 watts, not even in 20msec burst,and that's for an 100% randament!
That's a LIE, or, maybe they have discovered, new phisic laws...
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Old 6th October 2009, 04:37 AM   #10
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You must read more carefully. The chip goes on 1.5 volts but the power transistors will have more.
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