Datasheet

DataSheet
40W, Single Output
VER:00 Page 31 of 31 Issued Date2009/03/02
Safety and Installation Instruction
Fusing Consideration
Caution:This converter is not internally fused.An input line fuse must always be used.
This encapsulated converter can be used in a wide variety of applications, ranging from simple stand-
alone operation
to an integrated part of a sophisticated power architecture. For
maximum flexibility, internal fusing is not included;
however, to achieve maximum safety and system protection, always use an i
nput line fuse. The safety agencies
require a slow-blow fuse with a maximum rating of 8A for PXF40-24WSxx converters and 5A for PXF40-48WSxx
converters. Based on the information provided in this data sheet on Inrush energy and maximum DC
input current;
thesame type of fuse with a lower ratingcan be used. Refer to the fuse manufacturer’s data for further information.
MTBF and Reliability
TheMTBF of PXF40-xxWSxx series of DC/DC converters has been calculated using:
Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled
environment ).The resulting figure for MTBF is 1.105×10
6
hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25°C . The resulting figure for MTBF is1.511×
10
5
hours.