UC2577T power supply - diyAudio
Go Back   Home > Forums > General Interest > Car Audio
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 3rd April 2005, 03:35 PM   #1
diyAudio Member
Join Date: Sep 2003
Location: Illinois
Default UC2577T power supply

I know I've asked about simple PSUs for car amps before, but I think I may have finally found one that would work, a UC2577T-ADJ. I have some of them, and according to the datasheet, http://focus.ti.com/lit/ds/symlink/uc2577-adj.pdf, they can operate from 12VDC and output up to 60VDC at 3A.

I know little to nothing about switching PSUs, so I have no clue where to start with building this. Can anybody help me design a schematic for this so I can make a PCB and build it?

I don't know if I can use two of them to make a split suppy, but if I can I want to set the power of each around 28-29VDC, otherwise I want to set it at 56-58VDC.

Can this be done? If so, would somebody please help me figure how how?

  Reply With Quote
Old 3rd April 2005, 04:08 PM   #2
diyAudio Member
Join Date: Dec 2003
Location: Munich
Hi Mike

You can use it for a flyback converter.
Then +/- 28V are possible.

Check for a similar, but little more powerful device
from National.
The data sheet also contains schematics for flyback.
In figure 9 you can see a flyback which delivers pos and neg output voltages.
In flyback topologies, take care for leakage inductance of the transformer and proper snubber for the switch.

Good luck
  Reply With Quote
Old 3rd April 2005, 04:26 PM   #3
diyAudio Member
Join Date: Dec 2003
Location: Munich
Figure 10 & 11 of the LM 2587 data sheet, of course.
Figure 9 is a single output.....
  Reply With Quote
Old 3rd April 2005, 05:09 PM   #4
diyAudio Member
Join Date: Sep 2003
Location: Illinois
Thank you.

Are the two chips interchangeable, so I can use the schematic from National for the TI chip? I have that one and would like to use it.

Also, the transformer used in that circuit, do I have to wind one myself. Can I just use a torrid core and wind until I get the voltage I want? Or will I have to change something on the chip so it knows I am running 28V not 12V in the feedback.

And, will I be able to get the full 3A, or because of the step-up transformer, will I be trading voltage for current.

Finally, can I parallel more than one of the chips to get more current? For example, if I were to get 4 of the National Semiconductor ones, could I parallel their outputs to get 20A going into the transformer?

Thanks so much for the help,
  Reply With Quote
Old 3rd April 2005, 05:48 PM   #5
diyAudio Member
Join Date: Dec 2003
Location: Munich
The chips are not interchangeable without circuit adjustments.
BTW: 3A in the data sheet means the max. current of the switch
in the data sheet. The possible output current to 60V DC rail
will be MUCH less ! Best case in a boost arrangement, when operating
from 12Vdc input will be about an output of 60V / 300mA. More realistic 250mA. Also is 60V output voltage of a boost converter to close to the max. operating of 65V of the switch. If you go for
flyback you can handle this by a suitful transformation ratio, but
this will again reduce the possible output current.
Simple paralleling is also not fortunate... except for blowing it.
Just "pick a torroid and wind".... oh, oh... well somtimes it looks
like this if you watch experts. But it isn't that easy.

For higher power car smps, you should consider a push pull converter anyway.

You have two options:
Search the WEB and the this forum for fundamentals about flybacks (or for push pull) and then rebuild a design that is close to your requirements. When it works, slowly start to modify to the direction you need.
Search a proven SMPS design (including PCB) that exactly
matches to your requirements and hope that it will work.
  Reply With Quote


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
Split Voltage Switching Power Supply for Power Amp vectorplane Swap Meet 2 23rd April 2011 11:48 PM
LTspice tool for power amp power supply component evaluation andy_c Software Tools 2 23rd August 2009 05:10 PM
is there a circuit for a power supply to power the differant add on clocks frank2395 Digital Source 1 30th June 2005 09:33 AM
selling high current power supply for power amps. ericpeters Swap Meet 0 14th January 2005 02:21 PM
heater supply (xformer specs are 6.3V 2.5A) as supply for a power LED? jarthel Tubes / Valves 10 21st July 2003 01:30 PM

New To Site? Need Help?

All times are GMT. The time now is 11:32 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2