
11
PKB 4000
EN/LZT 146 033 R1A Ericsson Power Modules, October 2003
Quality
Reliability
The Mean Time Between Failure (MTBF) of the PKB 4000 series
DC/DC converter family is calculated to be greater than (>) 3.7
million hours at full output power and a PCB temperature of
+90°C using the Ericsson failure rate data system (TILDA/
Preditool). The Ericsson failure rate data system is based on field
failure rates and is continuously updated. The data corresponds
to actual failure rates of components used in Information
Technology and Telecom equipment in temperature controlled
environments (TA= -5...+65°C). The data is considered to have
a confidence level of 90%. For more information please refer to
Design Note 002.
Quality Statement
The PKB 4000 series DC/DC converters are designed and
manufactured in an industrial environment where quality
systems and methods like ISO 9000, 6
(sigma), and SPC
are intensively in use to boost the continuous improvements
strategy. Infant mortality or early failures in the products
are screened out and they are subjected to an ATE-based nal
test. Conservative design rules, design reviews and product
qualications, plus the high competence of an engaged work
force, contribute to the high quality of our products.
Limitation of Liability
Ericsson Power Modules does not make any other warranties,
expressed or implied including any warranty of merchantability
or fitness for a particular purpose (including, but not limited to,
use in life support applications, where malfunctions of product
can cause injury to a person's health or life).
Miscellaneous
The PKB 4000 Series DC/DC converters are intended for
through hole mounting on a PCB. When wave soldering is
used max temperature on the pins are specified to 215°C for 10
seconds. Maximum preheat rate of 4°C/s is suggested. When
hand soldering is used a thermocouple needs to be mounted on
the DC/DC converter pins to verify that pin temperatures does
not exceed 215°C for longer time than 10 seconds with the used
soldering tools.
No-clean flux is recommended to avoid entrapment of cleaning
fluids in cavities inside of the DC/DC power module. The
residues may affect long time reliability and isolation voltage.
Soldering Information
Design for Environment (DfE)
The PKB 4000 Series DC/DC converters are designed to full
the wanted functionality with minimum environmental impact.
The low weight high efciency converters are assembled by
using lead free solder and a PCB with halogen free ame
retardant. The converters are shipped in a recyclable package.