Amund -
A power supply rated for 24 V, 100 W, might not meet LPS requirements. Tables 2B and 2C of the 60950 standards apply under worst-case loading conditions. The limitation of 100 VA is into a Thevinin equivalent impedance (for practical reasons, usually only resistance is used in testing). A supply rated to deliver 100 W can typically deliver greater than 100 W under maximum power transfer loading. Maximum available current is also a concern (it is *not* always a short-circuit). Regards, Peter L. Tarver, PE [email protected] > From: Amund Westin > Sent: Sunday, April 25, 2004 1:20 PM > > Hi all, > > Looking for an external AC/DC adapter with output > power rating up to > 100W/24VDC. Our equipment has a plastic enclosure > (flame class /HB > material), and therefore need a power that is > classified as Limited Power > Source, ref IEC60950 chapter 2.5 > > Question: > Has I interpreted the term "Limited Power Source" > correct when I conclude > that a 100W power supply is the maximum rating > for such a power source? > This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
