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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th May 2010, 12:16 PM   #111
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So how many watt 230V (or 110V) transformer would that require?
I guess the max current flow is quite theoretical as you would't play at 100W very long. Maybe if using very low efficient speakers, or for PA use, you could play at 2*100W.
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Old 17th May 2010, 12:18 PM   #112
teamacc is offline teamacc  Netherlands
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At 24v at 4ohms, max possible consumption will be 6 amps (24/4=6).
This way, the max ever reachable is 24*4=92watts.
But as 32 volts makes 100watts, 24v will make 24/32*100=75watts.
This way, max power consumption will be 2*75w=150watt=150VA.
I would recommend something bigger though.
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Old 17th May 2010, 12:23 PM   #113
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Quote:
Originally Posted by teamacc View Post
At 24v at 4ohms, max possible consumption will be 6 amps (24/4=6).
This way, the max ever reachable is 24*4=92watts.
But as 32 volts makes 100watts, 24v will make 24/32*100=75watts.
This way, max power consumption will be 2*75w=150watt=150VA.
I would recommend something bigger though.
Thanks!
When you say 32 volts makes 100W, is that info from tripath datasheet or from hifimediy? He wrote me something like its able to produce more than 100W.
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Old 17th May 2010, 12:28 PM   #114
sendler is offline sendler  United States
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Default Watts

Quote:
Originally Posted by Nick122147 View Post
So how many watt 230V (or 110V) transformer would that require?
I guess the max current flow is quite theoretical as you would't play at 100W very long. Maybe if using very low efficient speakers, or for PA use, you could play at 2*100W.
Watts and VA are the same. Transformers are rated by their output. The amps are 85 percent efficient. If you want 200 watts out of the amp, you need a transformer that can supply 235 watts.
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Old 17th May 2010, 02:38 PM   #115
teamacc is offline teamacc  Netherlands
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But bear in mind max output is limited by voltage*voltage/impedance. This is max output rating THEORETICALLY!
If you divide this by 0.85, you get the VA rating you need.
So basically, VA rating depends on voltage and impedance of your speakers.
Keep in mind Vac*1.41=Vdc.
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Old 17th May 2010, 03:45 PM   #116
sendler is offline sendler  United States
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Default Rectified dc

I was wrong in figuring the rating on the higher rectified dc voltage. A 170VA transformer will do it.
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Old 18th May 2010, 10:11 AM   #117
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Originally Posted by sendler View Post
33 volts*7 amps = 230 VA at least. Now your transformer alone will cost more than a 9 amp MeanWell SMPS. I have never seen my amps average more than .35 amps of current consumption when playing though.
A Meanwell SMPS would be somewhat cheaper, and possibly offer better performance. But a toroid transformer might fit more easily in a small case. It's a question of tradeoffs - some of us don't have room for a big shelf-sized chassis.

However, I'm still a bit unclear on how TK2050 amps consume power. The optimal DC voltage (all other factors being equal) seems to be in the 32-36 volt range. So if voltage and resistance are constants, then I assume current consumption (amps) will fluctuate according to the type of music played (e.g., bass vs. treble) and the volume at which it's played?

On a related note: has anyone noticed a difference when using two different power supplies with the same voltage, but different amp ratings? Or does a 120w supply pretty much sound the same as a 350w supply under normal listening conditions?
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Old 18th May 2010, 10:48 AM   #118
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@SoldierAnt76: amplifier impedance is never fixed... it fluctuate with the music flow... that's how we get the sound outputed as AC signal... It is the Power supply voltage supply that should be able to retain the same for whatever the load change... (and thus the current flow...)

in my limited experience (with chip amps and not with this Tripath amp), power supply impedance (and regulation) and transient response influence more on the final sound than the maximum supply (which may never be needed in normal listening conditions)

this could be the reason why batteries sound good, even with it's lower voltage supply... [good] battery response to the amplifier impedance change without any limit on how much current requested...
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Old 19th May 2010, 09:41 AM   #119
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Quote:
Originally Posted by teamacc View Post
At 24v at 4ohms, max possible consumption will be 6 amps (24/4=6).
This way, the max ever reachable is 24*4=92watts.
But as 32 volts makes 100watts, 24v will make 24/32*100=75watts.
This way, max power consumption will be 2*75w=150watt=150VA.
I would recommend something bigger though.
I belive the max ever reachable should be 24*6=144w as p=vi
or you can work it out with p=i*i*r = 6*6*4 = 144w.
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Old 19th May 2010, 10:01 AM   #120
teamacc is offline teamacc  Netherlands
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As with 32v max specified output is 100w, max on 24v will be equally less, maybe even squared.
So, if squared (which i think it is), power output on 32v is 100w
24v is 2/3 of that, so power will be reduced to 4/9 of the original power, resulting in approx 45w/channel.
So on 24v, even a 45w psu might cut it.
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