NEWBIE - POWER SUPPLY SIMULATION PROBLEM - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools

Software Tools SPICE, PCB CAD, speaker design and measurement software, calculators

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 July 2011, 09:00 PM   #1
diyAudio Member
 
obiwankenobi's Avatar
 
Join Date: Mar 2011
Location: Buenos Aires - Argentina
Default NEWBIE - POWER SUPPLY SIMULATION PROBLEM

Hello friends, I am a newbie to SPICE nad Micro-Cap.
I need help with this simulation. It is about a 50V @ 10 A power supply.
The original circuit was taken from the National Semiconductor LM723 datasheet.
I added one Darlington and extra power transistors.
The problem is that before going deeper in the simulation, I can see that the D4 Zener diode shows a very high voltage of almost 80 V instead of the rated 36 V.
I tried to lower the output current and I think that leaving the CL and CS terminals of the LM723 is not a good idea for the simulation.
I searched for some specific Micro-Cap forum in Google but no luck.
What am I doing wrong ?

Thank you in advance.
Attached Images
File Type: jpg Captura_78.jpg (96.3 KB, 70 views)
File Type: jpg Captura_79.jpg (113.6 KB, 67 views)
  Reply With Quote
Old 27th July 2011, 06:19 PM   #2
kaspich is offline kaspich  Latvia
diyAudio Member
 
Join Date: Jul 2011
U drop on D4 is 79.3-45.5 = 33.8V and is OK

1. replace D2 with 100ohm
2. add 1Kohm between B and E of X2
3. add 100ohm between E/X2 and CL/UA723
4. replace R1 with current source
5. replace D4 with 15..20V zener
  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
Newbie Aikido power supply question JackM11 Tubes / Valves 14 2nd August 2008 12:58 AM
Sonic Impact Power Supply-Newbie ReallyBigWoofer Class D 14 18th January 2007 07:32 PM
power supply pspice simulation problem metebalci Tubes / Valves 9 10th August 2004 02:59 PM
newbie gainclone/power supply question wotan2525 Chip Amps 7 26th February 2003 07:25 PM
Newbie circuit question - DC Adapter Power Supply Bwee Everything Else 1 8th September 2001 09:27 PM


New To Site? Need Help?

All times are GMT. The time now is 05:12 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