Piotr - To expand on Ted's below (and quite correct) response, PTC's are treated in such applications as fixed impedances, despite their current dependent impedances. Thus, viewing the source from the load side of the PTC's impedance is included (in a Thevinin sense) as a part of the source impedance.
Regards, Peter L. Tarver, PE [email protected] > From: Ted Eckert > Sent: Wednesday, October 11, 2006 8:00 AM > > Hello Piotr, > > I recommend using clause 2.5 as guidance. This clause > describes limited > power sources for a different rating and purpose, but it can > be used as > guidance as to the proper limiting of any power source. > > It state that a power supply with a PTC will be considered > limited if a > positive temperature coefficient device is used, as long as > the PTC passes > the tests specified in IEC 60730-1, clauses 15, 17, J15 and J17. > > > Ted Eckert CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. _____________________________________________________________________________ Scanned by Sanmina-SCI eShield _______ _____________________________________________________________________ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
