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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: rfwilson@intergate.nospam.bc.ca (Bob Wilson) Newsgroups: sci.electronics.design Subject: Re: power supply pwm design help Date: Sun, 29 Sep 2002 18:01:55 -0000 Organization: Your Organization Message-ID: <upeg0jk1vma0d5@corp.supernews.com> X-Trace-PostClient-IP: 216.113.215.216 X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit) References: <EHql9.5391$t6.499592@newsread1.prod.itd.earthlink.net> <an5e29$r97@dispatch.concentric.net> <upctjhhh1v3iad@corp.supernews.com> <an7df9$r9r@dispatch.concentric.net> In article <an7df9$r9r@dispatch.concentric.net>, pmte@concentric.net says... > >Bob wrote: > >> > Get yourself a copy of SwitcherCAD III from www.linear.com/software. >> > It will synthesize a SMPS for you from the above description. Use >> > the menu item "File=>Switch Selector Guide" I just tried it and it >> > will design a SEPIC topology converter that's perfectly stable over that >> > input voltage range. >> >> Yes, you too can design a switchmode power supply without >> understanding anything about it! > >I really don't understand this comment. I wrote the syntheszier in >SwCADIII and just verified that it makes a completely practical >circuit for his application. BTW, the topology is called SEPIC, not >"standard Buck-Boost topology" as you wrote it your other post. First, the topology I was referring to is *NOT* a SEIPC. What *I* was referring to is indeed called a Buck-Boost. This topology has 2 transistors and two diodes. What it does is first connect the inductor from Vin to ground. Then after energy is build up in the inductor, it the end that was connected to Vin is switched to ground, and the end perviously grounded is switched to be connected to the output. It is a very simple circuit that is part of the flyback family. In continuous mode operation, Vout = [(Vin x D)/(1-D)], for an output voltage that can seamlessly range from far below Vin to well above. It main disadvantage is that since current passes through 2 devices (a diode and a transistor or FET), its efficiency is a little lower than for a separate Buck or Boost. But this is offset by its simplicity and ease of design, which is far less inscruitable tha a SEPIC. My comment was not directed at you personally, but rather the apparent suggestion one can substitute actual undersanding of the the underlying principles of SMPS design, by having the software do the work. When the design doesn't work for some reason, the newbie (to this field of design) is left without a clue how to make it work because he has no understanding of the basics. My opinion of Switchercad is that it is a nice piece of sales material intended to lock you into using Linear Tech's devices. Sure, P-Spice (upon which it is based) is a good tool, but not for an amateur who doesn't understand the principles. I am reminded of new engineers at a former job who spent weeks (even months) "designing" RF devices with their nose glued to the computer monitor. Once the design was built, it generally did not work as expected (or often, at all). The comments generally ran along the line of "Well, there's NOTHING wrong with the design, because it worked in SPICE!". They were generally told something like "Welcome to the REAL world". Bob. </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>