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Class D Switching Power Amplifiers and Power D/A conversion

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Old 5th October 2006, 04:18 AM   #11
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Default the sweet(er) spot?

" ... can drive 125W, 8 ?, at less than 0.09% THD+N with 95% efficiency. ..." From: http://www.ti.com/corp/docs/landing/tas5261/index.htm

Looks like their standard model is designed strictly for 8 ohms, 6 or 4 ohm loads need not apply ... or keep a lid on it, power wise.

" ...
Short-circuit protection
Over-current protection
Undervoltage protection
PWM activity detector for loss of PWM input signal ..."

Add to this list:
Over 125W limiting ...

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Old 5th October 2006, 04:30 AM   #12
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Default Possibly as a sub driver ...

TI makes a good case for this as a sub-woofer driver ...

Anyway, I ordered a couple of samples ... looking for a project?

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Old 5th October 2006, 11:29 AM   #13
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Default Recommended Printed Circuit Board (PCB) Layout

http://focus.ti.com.cn/cn/lit/ds/symlink/tas5261.pdf
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Old 5th October 2006, 11:36 AM   #14
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I really like the pin out for the power and output side of that chip. The input side isn't too shabby either. What's up with that noise amplitude graph in figure 9? The signal at 1khz is only at -60dbr, of course you won't see any other harmonics...
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Old 5th October 2006, 12:55 PM   #15
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I don't know how to make it work with this input stage, since I never did any Digital Amp... If it's able to be a 300W output stage, why they don't make a single chip solution ?

I think this is a wonderful chip !! 95% of efficiency is something just incredble ! Using it on a 8Ohms Load at full power, it will only dissipate 6,25W of heat

Anyway, what do I need for the input ? I mean, what chips and how to connect to have a complete amplifier that I can conect my iPod / Discman on it ?

I'm building a pair of Beyma Speakers, with a 100W RMS Woofer 10" 8Ohms, and I should make it self powered, as heat is a big problem I found this chip great. Does it sound good?




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Old 5th October 2006, 01:21 PM   #16
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Quote:
Originally posted by -_nando-_
Does it sound good?
Is that important with 315 W into 4 Ω at 10% THD+N ?
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Old 5th October 2006, 02:48 PM   #17
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Oh, it is... I'll drive 8 Ohms Hi-Fi speakers, but I believe that it sound better than a Gainclone, am I right?

I'm looking for SKA too, then I'll see the cost x benefit of both and decide
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Old 5th October 2006, 04:46 PM   #18
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Default Need a little help here:

... I noticed that the pdf file docs & graphs on this chip indicate that it might be quite good as an element in a bi-amped or tri-amped system as well as a mono-block sub woofer amp. ( http://focus.ti.com/lit/ds/sles188/sles188.pdf ... pp. 7 through 13 ... graphs on pp. 11, 12, 13 )

THD limits ?
100W into 8 ohms = PS rail voltage +/- 45 VDC (THD~= 0.07%)
~75W into 6 ohms = PS rail voltage +/- 25 VDC (THD ~=0.07%)
( THD goes all to heck into 4 ohms >>= 0.1 above 3W = )

Comments please? Got ideas to improve on this? Any idea if this is worth doing?

(I have two samples coming and intend to get together some boards if anyone is interested.)

....

-_nando-_ " ... I'll drive 8 Ohms Hi-Fi speakers, but I believe that it sound better than a Gainclone, am I right? ..."

Not really, I have seen higher power Gainclones with better THD specs.

jean-paul: " ... Is that important with 315 W into 4 at 10% THD+N ? ..."

Yes, to me any way. I tend to dis any amp with worse THD than about 0.1% = bad work arounds or bad design / execution = good for nothing except maybe sub-woofer drivers.

-_nando-_ " ... 95% of efficiency is something just incredble ! ..."

Yes, and that is what may make this chip worthwhile.

" ... 'm wondering if this might do the trick: http://shop.dataip.co.uk/products.html?prodid=81 ... board pic ..."

Probably would work OK = 36 pin surface mount chip, so there would be some extra room on the baord for other stuff.

BWRX: " ... I really like the pin out for the power and output side of that chip. The input side isn't too shabby either. What's up with that noise amplitude graph in figure 9? ..." (on page 13 of the pdf file.)

My guess is that the graph is frequency = 1k Htz increments = ?? If the spike is really around 1K Htz, then my concern would be that point as well as around 2 to 20 Htz ... possible the 1K spike will have to be delt with at the power supply.

One reason for this may be: TI indicates a "split" or "Half Bridge" PS (page 4 and elsewhere) .. ?? I guess this means two half bridge rectifiers, one for each power rail (??). Any ideas or clarification here would be appreciated.

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Old 5th October 2006, 04:59 PM   #19
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Default That PC board layout in the docs ...

... is probably not correct. It looks like the docs refer to a 36 pin surface mount chip and that board looks like it is designed for a 16 / 18 pin chip w/ heat sink mount ... ??

" " ... 'm wondering if this might do the trick: http://shop.dataip.co.uk/products.html?prodid=81 ... board pic ..."

I won't know for sure until the chips get here ...

Later

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Old 5th October 2006, 05:38 PM   #20
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Default Re: That PC board layout in the docs ...

Quote:
Originally posted by FastEddy
I won't know for sure until the chips get here ...
They just send me this stuff without asking...
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