New TK2050 board - Page 12 - diyAudio
 New TK2050 board
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Class D Switching Power Amplifiers and Power D/A conversion

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 17th May 2010, 11:16 AM #111 diyAudio Member   Join Date: May 2005 Location: Shanghai 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.
 17th May 2010, 11:18 AM #112 diyAudio Member   Join Date: Jan 2010 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.
diyAudio Member

Join Date: May 2005
Location: Shanghai
Quote:
 Originally Posted by teamacc 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.

diyAudio Member

Join Date: Aug 2004
Location: ny
Watts

Quote:
 Originally Posted by Nick122147 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.
__________________
Scott

 17th May 2010, 01:38 PM #115 diyAudio Member   Join Date: Jan 2010 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.
 17th May 2010, 02:45 PM #116 diyAudio Member   Join Date: Aug 2004 Location: ny Rectified dc I was wrong in figuring the rating on the higher rectified dc voltage. A 170VA transformer will do it. __________________ Scott
diyAudio Member

Join Date: Mar 2010
Quote:
 Originally Posted by sendler 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?

 18th May 2010, 09:48 AM #118 diyAudio Member   Join Date: Mar 2004 Location: Jakarta @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...
diyAudio Member

Join Date: Sep 2008
Location: Brisbane
Quote:
 Originally Posted by teamacc 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.

 19th May 2010, 09:01 AM #120 diyAudio Member   Join Date: Jan 2010 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.

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post aquapiranha Class D 3 30th May 2011 11:06 PM finnbow Class D 10 2nd May 2011 11:37 PM paolo66 Class D 1 24th November 2009 05:10 PM xaudiox Class D 2 8th May 2009 07:50 AM Eccu Digital Source 0 19th April 2002 11:06 AM

 New To Site? Need Help?

All times are GMT. The time now is 09:39 AM.