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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: "Stefan Toftevall" <stefan.toftevall@(remove_this)bredband.net> Newsgroups: sci.electronics.design References: <m7hQ9.32128$Y2.1142@news2.bredband.com> <gqd31vgphuadfglt3ed40hbaru8vo1kqtk@4ax.com> Subject: Re: High-side switch X-Newsreader: Microsoft Outlook Express 6.00.2720.3000 Message-ID: <lXjQ9.32197$Y2.1204@news2.bredband.com> Date: Tue, 31 Dec 2002 17:52:33 +0100 NNTP-Posting-Host: 213.112.249.76 NNTP-Posting-Date: Tue, 31 Dec 2002 17:52:33 CET Organization: A customer of B2 Bredbandsbolaget (www.bredband.com) Pulse transformers is totally out of the question, since this supply is going to be very compact and supply not more than 15W or so, to a stand-by circuit that will in turn control VERY high power levels. But that's another story. High-side switch is what it'll be, in some way. --- Stefan "Spehro Pefhany" <speff@interlog.com> skrev i meddelandet news:gqd31vgphuadfglt3ed40hbaru8vo1kqtk@4ax.com... > On Tue, 31 Dec 2002 14:40:34 +0100, the renowned "Stefan Toftevall" > <stefan.toftevall@(remove_this)bredband.net> wrote: > > >Hi all, > > > >I need a high-side switch working as a basic non-isolated step down > >converter. > >It will operate directly from mains-voltage of 325V maximum, it will > >regulate output voltage to 50V by > >a PWM circuit. Output-current won't be very high, probably max 250mA. I > >couldn't find any P-channel MOSFET suitable for this high voltage > >enviroment. > > There are few, though I think there are 500V rated P-channel MOSFETs. > Why would you use a high side switch, anyway? > > >Operating frequenzy isn't critical, somewhere between 50k - 100kHz. > > Fairly high. If you could go very low, IGBTs are another possibility. > > >Those charge-pump high-side drivers is interesting, making it possible to > >use a standard N-channel FET. > > Yes, IR has a bunch of them. Or solutions involving transformers. > > Best regards, > Spehro Pefhany > -- > "it's the network..." "The Journey is the reward" > speff@interlog.com Info for manufacturers: http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com > </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>