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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 18:06:02 -0000 Organization: Your Organization Message-ID: <upeg8asrlivr64@corp.supernews.com> X-Trace-PostClient-IP: 216.113.215.216 X-Newsreader: WinVN 0.99.9 (Released Version) (x86 32bit) References: <EHql9.5391$t6.499592@newsread1.prod.itd.earthlink.net> <upctfdm95fo283@corp.supernews.com> <upe3vm2sdcq115@corp.supernews.com> In article <upe3vm2sdcq115@corp.supernews.com>, harryd@tdsystems.org says... > > >"Bob Wilson" <rfwilson@intergate.nospam.bc.ca> wrote in message >news:upctfdm95fo283@corp.supernews.com... >> In article <EHql9.5391$t6.499592@newsread1.prod.itd.earthlink.net>, >> danielmm@earthlink.net says... >> > >> >I am having a problem with a power supply circuit. Here is the >> situation.... >> > >> >The input is from a battery, 2.7v to 4.1v. >> >The output is 3.3v up to 500mA! >> > >> >I am currently using a Fairchild part ilc6363 to do this, (The ILC6363 >> >step-up/step-down DC-DC converter is a switch mode converter). The >problem >> i >> >have is it is overly sensitive. It can run in 2 modes, PWM or PFM. PFM is >> >designed to be for low current and PWM is for higher current. >> > >> >If i run the part in PWM mode constantly, the output is not stable at low >> >currents and can go up to 3.9v. This is too high for our CPU. >> > >> >If i run the part in PFM mode constantly, the part gets hot and sometimes >> >blows at high currents! >> > >> >I cant really switch the modes back and forth because i dont have a way >to >> >monitor the current loads. I may have to implement this later if i dont >> find >> >another solution. >> > >> >Any help with the circuit or another alterative would be appreciated! >> >Thanks. >> > >> >daniel. >> >dtm28@earthlink.net >> >Please cc email!! >> > >> >> >> Why the complexity? Use a standard Buck-Boost topology. Output voltage can >> range from well below to well above Vin (with the same output polarity as >> input polarity). >> >> Bob. > >So Bob, when you say "standard Buck-Boost topology topology" do you mean >SEPIC? > No, not at all. See my parallel post for a more complete description. The topology I refer to is essentially the Buck and Boost merged into one. It has been around for years, although for some reason seems to be not all that well known. It is part of the Flyback family, and (unlike the SEPIC) is easy to understand and implement, and simple to make. 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>