Datasheet

40W, Dual Output
VER:00 Page 35 of 35 Issued Date：2009/03/02
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 sophistic
ated power architecture. To maximum flexibility, internal fusing is not
included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety
agencies require a slow-blow fuse with maximum rating of 8
A. Based onthe information provided in this data sheet on
Inrush energy and maximum DC
input current; the same type of fuse with lower rating can be used. Refer to the fuse
manufacturer’s data for further information.
MTBF and Reliability
The MTBF of PXF40-xxDxx dual output DC/DCconverters has been calculatedusing
Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled
environment ). Theresulting figure for MTBF is1.398×10
6
hours.
MIL-HDBK-217F NOTICE2 FULL LOAD, Operating Temperature at 25°C ℃. The resulting figure for MTBF is
3.585×10
5
hours.