Well, this seems to be the week for it! Maxim Analog Design Guide, 20th Edition, latest issue, just hit my mailbox yesterday.
"SOT-23 Undervoltage/Overvoltage Detectors .....", MAX6457 - MAX6460 Try http://www.maxim-ic.com . Good luck, Bob Smith --- Avoid computer viruses, Practice safe hex --- -- Specializing in small, cost effective embedded control systems -- Robert L. (Bob) Smith Smith Machine Works, Inc. 9900 Lumlay Road Richmond, VA 23236 804/745-1065 [EMAIL PROTECTED] ----- Original Message ----- To: <[EMAIL PROTECTED]> Sent: Thursday, February 13, 2003 11:23 PM > Funny this suggestion should come up at just this time. > > See EDN, February 6, 2003, Page 86, "design ideas, Polarity protector > outperforms Schottky diodes". > > or http://www.edn.com > > The circuit seems to have been designed to address your requirements. > > > So far as understanding Triacs is concerned, I find that (like learning the > theory of almost any device) the manufacturers data books and application > notes are usually the most useful sources. > > For this case check out http://www.onsemi.com/pub/Collateral/DL137-D.PDF, > "Thyristor Device Data", Chapter 1, Section 2 addresses theory of > operation. > > Bob Smith > > > > --- Avoid computer viruses, Practice safe hex --- > > -- Specializing in small, cost effective > embedded control systems -- > > > Robert L. (Bob) Smith > Smith Machine Works, Inc. > 9900 Lumlay Road > Richmond, VA 23236 804/745-1065 > > [EMAIL PROTECTED] > > ----- Original Message ----- > From: "Robert Ritchey" <[EMAIL PROTECTED]> > To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> > Sent: Thursday, February 13, 2003 5:29 PM > Subject: Re: Over-voltage Protection > > > > The circuit should draw about 1.0A-1.25A. Sounds like a good > > idea if I can determine a good, cheap trigger circuit. > > Thanks, > > > > At 01:30 PM 2/13/03 -0800, Peter Vogel wrote: > > >Here's one I use that I don't think has been suggested. > > > > > >I use a MOSFET in series at the input, arranged to switch off on > > >over-voltage. I didn't notice what current your circuit draws, but if > > >you use a T0220 with a few milliohms resistance you get only a few > > >millivolts drop when on. Because you switch it off on over volts, no > > >power is dissipated. Use something like 100V device and it's > > >bulletproof. > > > > > >To protect against reverse voltage you have little choice other than a > > >reverse diode across the input. > > > > > > > > >BTW What is the total current drain of your circuit? > > > > -Bob > > -------------------------------------------------------------------- > > Robert Ritchey > > Quest Engineering & Development > > 1328 East Cottonwood Lane > > Phoenix, AZ 85048-4765 > > Tel: (480) 460-2652 > > FAX: (480) 460-2653 > > E-Mail: [EMAIL PROTECTED] > > E-Mail: [EMAIL PROTECTED] > > E-Mail: [EMAIL PROTECTED] > > E-Mail: [EMAIL PROTECTED] > > WWW: www.QuestEngDev.com/ > > WWW: www.Smart-Fly.com/ > > -------------------------------------------------------------------- > > > > -- > > Author: Robert Ritchey > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web hosting services > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB CHIPDIR-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > > > > -- Author: Robert Smith INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
