How to rate current from 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 26th September 2010, 02:57 PM   #1
diyAudio Member
 
Zero Cool's Avatar
 
Join Date: Sep 2004
Location: MN
Default How to rate current from SMPS??

At a garage sale the other day i picked up a couple of broken soundstream car amps for a couple bucks. The smaller amp an SA-80 has a separate SMPS power supply board inside which i found very interesting as I had hoped to use just the power supply parts anyway for a LM3886 based car amp project. this board looks like it would work perfect and the voltage is about right.

it is based on a SG3524 IC with a pair of BUZ11 mosfets driving a toroid transformer, feeding to TO-220 type dual high speed diodes and 1000uf per rail. I see that the board is short stuffed and that 2 additional pairs of mosfets could be added and 4 more capacitors. a very simple design.

I am curious if i can figure how what the rated current is for this power supply? is there a method to tell? or should i just load it down and see if/where it breaks or otherwise sags past some point? I see that the SG3524 has some current limiting protection inside. maybe the supply will just shut down?? I am looking for schematics now.
  Reply With Quote
Old 26th September 2010, 03:56 PM   #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
first of all this is unregulated supply, so output voltage depends a lot on input voltage.
one way is to find how strong was the original amp, my guess is that one or two LM3886 won't draw anywhere too much current, I wouldn't even try to see what the max is.

it could have overcurrent protection.
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  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
Peak Current in SMPS microsim444 Power Supplies 6 3rd January 2009 03:14 AM
Smps-current-filter Paswa Power Supplies 5 28th December 2007 02:22 AM
SMPS Current protection kasiss Power Supplies 25 12th August 2007 08:56 PM
Estimate power transformer current rate? vax9000 Tubes / Valves 3 5th May 2006 11:49 PM


New To Site? Need Help?

All times are GMT. The time now is 03:56 AM.


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