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Old 5th October 2009, 10:54 PM   #1
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Default Class D Audio, Who are these guys?

I was sifting through some E-bay stuff today and came across a California based company that makes some incredible looking class d amplifier modules... they actually use high grade parts... So I ordered one of the new 600 watt T.I. based boards based on the TAS5630. Looking forword to this as I have never even been in contact with any class D amplifier since the original Infinity Class D amplifier back in the late 1970's. This thing has some amazing claims and is reasonably priced at $155.00. Has anyone here built an amp with this chip yet or used this copmpany's products? I was pleased at the support I got on the questions I had... everyone was answered within 5 minutes of me sending them e-mail!!
My only comment on the physical constraints of this board is I wish they had put a ribbon cable type terminal board for hooking up external LEDs.

http://classdaudio.com/index.php?main_page=index Home Page

http://classdaudio.com/index.php?mai...products_id=17 600 watt T.I. Page



Mark

Last edited by Mark Allen; 5th October 2009 at 10:57 PM.
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Old 7th October 2009, 01:35 AM   #2
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Old 8th October 2009, 03:42 PM   #3
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Mine came yesterday by Priority Mail. Hooked it up to my variable bench supply and running it at about 45 volts... end less current available since the supply can do 20 amps. This Class D board requires but a single 50 volt supply to operate. Initially I didn't like what I heard.. a bit ragged top end... but later as the amp warmed up a bit things started to get better. It's certainly a very different sound from what I am used to (Pass and Krell). One thing I will attest to is the abundant power this tiny board can put out!!! It is also stable all the way down to 2 ohms. Plenty of status LEDs are on the board... Reset, Shutdown, Hi Temp, and Ready. There are also connection points on the board to tie external indicator LEDs for these and I know fopmr the T.I. data sheet that this chip also has a pin for Clip Indicator and I wonder why they did not bring this out to at least a tie point??? There is a two pin connector for a 12 volt fan and another 2 pin socket for external sync. I ran it all afternoon yesterday and the heat sink only got mildly warm even when pushing this amp at very loud levels for long periods. So unless you're running 2 ohm loads I shouldn't think that either a fan or larger heatsinking would be needed. More later...

Mark
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Old 8th October 2009, 09:15 PM   #4
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Thanks Mark for the update. I'm very interested in hearing more about this amp and it's sound, pics would be great. In your opinion, how is the build quaility and layout?

My second comment is we know this is not a "D class amp" design but it's design and concept has the same spirit as a D class amp. I for one would be very curious to find out how this amp sounds compared to a good D class amp.
It would be great if some how we can get a decent review between the D Class amp, a A/B amp like the one above and a Chip amps. Out of all of these which design is producing the best sound/music (I know subjective) at the same level of build quality?

Last edited by mr_macgee; 8th October 2009 at 09:22 PM.
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Old 8th October 2009, 09:30 PM   #5
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I'm pretty sure it's class D based on TI chips. This guy is based in the US, not the UK as the one posting here as "ClassD-audio". The output low pass filters are the giveaway!
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Old 8th October 2009, 09:39 PM   #6
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There were ramblings in a other thread ( http://www.diyaudio.com/forums/showt...om#post1878688 ) about how this amp (http://classdaudio.net/ & http://classdaudio.com/ both are same guy & company located in So. CAL) should not be in the D Class forum because it was a a/b amp. I myself an not sure of which class this amp belongs too but more importantly I'm curious about it's performance and it's sound/music qualities.

Pic of the 250w x 2 / 500w x 1 amp
Click the image to open in full size.

Last edited by mr_macgee; 8th October 2009 at 09:56 PM.
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Old 8th October 2009, 09:58 PM   #7
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The amp in the above photo is based on an International Rectifier chip of some sort. I haven't bothered to look it up.

The board I bought is built around the Texas Instruments TAS5630 DKD package. This is what T.I. says right on their spec sheet... So if you want to argue if it's Class D or not you should argue with them. It certainly belongs in this forum.

"The TAS5630 is a high performance analog input Class D amplifier with integrated closed loop feedback technology(known as Purepath tm HD)with the ability to drive up to 300 W stereo into 4 or 8 ohms speakers fomr a single 50 volt supply."

If you want to read the rest pf the schpeil its here:
http://focus.ti.com/docs/prod/folder...t/tas5630.html

The build quality is quite good although I have not actually looked at individual parts to assess their quality. They seem to have followed T.I.'s build practices very closely which is probably why it's been operating extremely stable just sitting on top of one of my speakers...

In the lower photo you can see the on board 12 volt supply and two of the indicator LEDs. Also the solder pads for the off board LEDs. Electrolytics are 105 deg.c rated. You can slso see the two OPA-1632 active balanced op-amps and their regulator transistors. Although the TAS-5630 requires an input cap I did'nt see one at first glance. Perhaps this OPA input stage eliminated the need for the input caps... Running single ended or active balanced only requires removing two jumpers, likewise for bridge mono mode. It sure is alot better built than the typical Asian board is. I give this guy alot of credit for going heads on against that market. I wonder how long it'll be before someone over there steals his design? I've started my stopwatch!

I looked up Team America and they are a handicapped organization. Apparently they assemble them.

Edit: T.I. does reccomend insulating the heatsink from the heat slug... I don't know if the slug is at an active DC level or what yet...

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Last edited by Mark Allen; 8th October 2009 at 10:16 PM.
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Old 8th October 2009, 10:44 PM   #8
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Thanks mark,

No need to read the data sheet, I'm was quite comfortable calling this a D class from the get go. The data sheet link does have an interesting video on it showing how to measure the output filter-free...

I look forward to hearing more about your build. Cheers
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Old 8th October 2009, 11:00 PM   #9
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Quote:
Originally Posted by mr_macgee View Post
There were ramblings in a other thread ( http://www.diyaudio.com/forums/showt...om#post1878688 ) about how this amp (http://classdaudio.net/ & http://classdaudio.com/ both are same guy & company located in So. CAL) should not be in the D Class forum because it was a a/b amp. I myself an not sure of which class this amp belongs too but more importantly I'm curious about it's performance and it's sound/music qualities.
Perhaps you are thinking of classd.ltd.uk. They have nothing to do with classdaudio.com or classaudio.net.

The amplifier you are referring to above is in fact a class-d amplifier based on the IRS2092.

Last edited by theAnonymous1; 8th October 2009 at 11:03 PM.
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Old 9th October 2009, 12:45 AM   #10
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I thought TI recommended using a high quality thermal transfer compound, simply to make sure there's good transfer of heat from the chip to the sink.

Later on in the data sheet they say the heat sink should have a good connection with the PCB ground.

There's nothing as far as I can tell, that says the heat sink should be electrically isolated from the chip.
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