Datasheet

Version:A/0 Page 15 of 17
Spire Corp.
Http://www.spirepower.com & Http://www.spirecoolers.com
Http://www.spire-corp.com
6 Reliability
6.1 Component Derating
The following component derating guedelines are recommended:
‧Semiconductor junction temperatrues shall not exceed 110℃ with an ambient
of 50℃.
‧Inductor case temperature shall not exceed safety agency requirements.
‧Capacitor case temperature shall not exceed 95% of rated temperature.
‧Component voltage and current derating shall be >10% at 50℃.
‧Magnetic saturation of any transformer will not be allowed under any line, load,
startup or transient condition including 100% transients on the five main outputs or
+5VSB.
6.2 Mean Time Between Failures(MTBF)
The power supply reliability is based on the calculation with the Part-Stress Analysis
method of MIL-HDBK-217F using the quality factors listed in
MIL-HDBK-217F. The power supply MTBF is 100,000 hours under the
following conditions:
- Full-rated load
- 230VAC input
- Ground begin
- 25℃ ambient