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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> Message-ID: <3DBC2B63.146AA440@rica.net> From: John Popelish <jpopelish@rica.net> Organization: This space not available for advertising. X-Mailer: Mozilla 4.7 [en] (Win98; U) X-Accept-Language: en Newsgroups: sci.electronics.design Subject: Re: Help - Power mosfets - difficult load References: <9dc3cc73.0210200019.dca32dc@posting.google.com> <9dc3cc73.0210211314.4d8d7254@posting.google.com> <aV0t9.58700$g9.167804@newsfeeds.bigpond.com> <9dc3cc73.0210220043.51d74f3@posting.google.com> <3e8t9.58968$g9.168494@newsfeeds.bigpond.com> <ap6pn8$l5f$1@naig.caltech.edu> <XfGt9.60835$g9.171852@newsfeeds.bigpond.com> <9dc3cc73.0210232337.1c2627e@posting.google.com> <3DB81206.E28CA99F@rica.net> <9dc3cc73.0210250151.2ce2ef74@posting.google.com> <3DB963BE.939694C2@rica.net> <9dc3cc73.0210270456.3b9ba31a@posting.google.com> Date: Sun, 27 Oct 2002 18:07:31 GMT NNTP-Posting-Host: 24.51.150.254 NNTP-Posting-Date: Sun, 27 Oct 2002 13:07:31 EST Bill Allison wrote: > I'd much appreciate your comments on the thread with Winfield re > switching speeds. My cheap little scope, by comparison to what you > guys have access to, has a usable response to 40Mhz-ish and a level > response only to 20Mhz, so maybe that sets a limit to how fast I > should attempt to drive the gate, if I'm to commission this by > assessing transient amplitude with scope whilst reducing safety > resistor initially in series with motor? Your scope can very nicely show sub microsecond transitions, and this is what you should shoot for. > > and use some hefty bypass capacitors between > > the non switched end of the schottky and the source of the fet. > > How hefty do you think? And low value low inductance caps in parallel? This all depends on the length and inductance of the loop back to the battery. The shorter these leads and the smaller the loop area, the less capacitance you can get by with. Remember that during the time that the battery lead inductance limits the current, this bank of capacitors has to carry up to the full motor current. During the on transient they keep the supply voltage from collapsing, but during the turn off transient, they must absorb the motor current that is flowing through the battery lead inductance. I would probably try a few microfarads of low inductance film capacitors in parallel with a couple high value electrolytic caps like the Panasonic T-UP series. The 100,000 uf 16 v ECE-T1CP104FA is listed in the Digikey catalog as having an 11.36 amp ripple current rating and a .02 ohm ESR (at 120 Hz). They don't list a an effective series inductance. I would also probably make a multi conductor battery cable that had several conductors for the positive and negative leads, with the whole bundle braided to interweave the two currents to lower the inductance, unless the battery were right next to the control circuits. Making the control circuit to be bolted directly to the battery would be even better, and eliminate most of the supply side bypass requirement. One of those side bolted GM batteries would make this easier. -- John Popelish </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>