newbie please help design a stabilized dc power supply

[gazzam]

hi all
new to this forum and would apreciate some help. i have been asked to design a stabilized dc power supply with the following specifications

output voltages 9V and 12V
rated maximum output current 1A
output current under short curcuit load <3A
output ripple voltage <10mV
input voltage 240V +-10% @ 50Hz
stability <4%
regulation <0.1
internal resistance <1 ohm

thanks

 

[karesz]

Hi,
Switcher or traditional?
K.

Added after 8 minutes:

As tradi: LM340+ one Transistor_3-5A regulator with your specs. L200 from ST has alone 2A capabilities, but not so precise regulated in worst case...
LM2576 >> 0..30V & 0-..3A regulated pwr-supply was at Edaboard parallel topic a subject too...


do not upload any file that is already available online and for free, give the link to the file only ..... MOD Aya2002


www.national.com/an/AN/AN-103.pdf

 

[gazzam]

thanks for the quick reply
traditional would be great thanks

 

[karesz]

0-50V 2A Bench power supply:
www.electronics-lab.com/projects/power/003/index.html
https://obrazki.elektroda.pl/69_1269632270.jpg

 

[Tahmid]

Hi,
Take a look at these:
http://www.elecfree.com/circuit/power-supply/regulator-ic-7805-7806-7809-7812/
http://www.kpsec.freeuk.com/powersup.htm
http://www.discovercircuits.com/DJ-Circuits/bat-elim2.htm

Hope this helps.
Tahmid.

 

[karesz]

Hi,
I think, these specs are more strong as a simple 78xx categorie?
OK, on the "discovery" is possible with some searching to find competenter versions too...
www.discovercircuits.com/P/pwr-variable1.htm
Variable Voltage and Current Power Supply,0-28V,0-3A www.bowdenshobbycircuits.info/page4.htm#ps3.gif
K.