35+35 800w smps - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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
Reply
 
Thread Tools Search this Thread
Old 16th September 2010, 04:30 PM   #1
diyAudio Member
 
Join Date: May 2008
Default 35+35 800w smps

I'm looking into building a 200+W x 2 chipamp and want to use a switching supply this time around.

What I don't know is if there are any bipolar SMPS on the market that meet my requirements, so far I have not been able to find a bipolar SMPS period.

If these cannot be bought off the shelf, how difficult is it to build one and are all of the parts available off the shelf?

I would need 30 to 35volt rails and a total power of around 800 watts give or take.

Any advice is welcome.
  Reply With Quote
Old 17th September 2010, 05:43 AM   #2
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
well you could buy 2, that have single output, don't think you will get 35v out of them (no such modul). Building one yourself, its easy for me, but could be very hard for you, if you didn't do anything like that before.
Also you don't need 800w, coz those amps will draw this power only as peak, not average, which meas you can get away with smaller powers
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 17th September 2010, 07:58 PM   #3
savu is offline savu  Romania
diyAudio Member
 
savu's Avatar
 
Join Date: Feb 2007
Location: Cluj - Napoca
Send a message via MSN to savu Send a message via Yahoo to savu
and also ...

why do you need it to have bipolar switchees insted of mosfets ?

regards,
savu
__________________
1'st rule of chess:
The only way to get smarter is by playing a smarter opponent.
  Reply With Quote
Old 17th September 2010, 09:37 PM   #4
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
You might be able to use two modified PC power supplies in series, each one tweaked up to 15v. Or get a 48v telecom supply and tweak it down, but going all the way down to 35v is asking a little much. Or you might be able to use a 48v supply as is and redesign your amplifier. TI's TAS5630 is designed to run on a 48v rail.

There's little reason to use bipolar for power supplies now. They were traditionally used at high voltages to overcome limitations of MOSFETs, but IGBTs are now the transistor of choice for high voltage, high current applications.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 17th September 2010, 09:48 PM   #5
diyAudio Member
 
Join Date: May 2008
I'm sorry perhaps I misspoke. I did not mean bipolar transistors I meant bipolar rails, as in +35 and -35 rails.
  Reply With Quote
Old 17th September 2010, 09:56 PM   #6
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
It's better to use a single rail design, like the TAS5630, unless you really need a ground referenced output for some reason.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 17th September 2010, 10:55 PM   #7
diyAudio Member
 
Join Date: May 2008
Star882, its funny you should say that. I was originally going to use this to drive a chipamp build of mine (lm3886) but recently decided to go with a class D design this time and I was looking at the TAS5630.

I also found many companies offer SMPS in this size. anything from 800-1500W at 48-60V is easily available.

I was thinking perhaps using two TAS5630's in a single chassis.

How do the TAS5630's sound? good enough to use with full range speakers? or would you recommend using it only for low frequency?
  Reply With Quote
Old 17th September 2010, 11:31 PM   #8
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
I haven't used the TAS5630 in my own design, but a demo board I saw at an IEEE event performed extremely well for the full audio spectrum.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Toroids 2 x 35-0-35 625va suit Aleph 2 dhole Swap Meet 0 2nd August 2005 08:33 AM
FS: 300VA, 35-0-35 ILP toroid transformer Possum Swap Meet 0 8th October 2003 05:15 AM
FS: 300VA, 35-0-35 toroid transformer Possum Swap Meet 2 12th March 2003 05:47 PM


New To Site? Need Help?

All times are GMT. The time now is 04:27 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2