Datasheet

Safety and Installation Instruction

Isolationconsideration

ThePXE20series features 1.6k Volt DC isolationfrom input to output, input to case,and output to case.The input to

output resistance is greater than 10

ohms. Nevertheless, if thesystem using thepower moduleneeds safety agency

approval,certain rules must be followedin the design of the system when using the product Inparticular, all of the

creepage and clearance requirements of the end-use safety requirement must be observed.These documents

include UL-60950-1, EN60950-1 and CSA22.2-960, although specific applications may have other or additional

requirements.

Fusing Consideration

Caution: This power module is not internallyfused.An inputline fuse must always be used.This encapsulated power

module can be used in a wide variety of applications,ranging fromsimple stand-alone operationto an integrated part

of a sophisticated power architecture.To maximum flexibility,internal fusing is not included; however, to achieve

maximum safety and system protection, always use an inputline fuse. The safety agencies require a slow-blow fuse

with maximum rating of 6.3A. Basedon the informationprovided in this data sheeton inrush energy and maximum

dc input current, the same type of fuse with lower ratingcan be used. Refer to the fuse manufacturer’s data for further

information.

Minimum Load Requirement

10%(of full load) minimum load required. The 10% minimum load requirement is in order to meet all performance

specifications. The PXE20 Series does not properlymaintain regulationand operate with a no load condition. The

output voltage drops off about 10%.

MTBF and Reliability

The MTBF of PXE20- has been calculated using:

1.MIL-HDBK-217F under the following conditions:

Nominal Input Voltage

Io = Io,max

Ta = 25℃

Theresulting figure for MTBF is 7.650× 10

hours.

2.Bell-coreTR-NWT-000332 CaseI:

50% stress, Operating Temperature at 40 ℃ (Ground fixed and controlled environment)

Theresulting figure for MTBF is 1.928× 10

hours.