Reliable LED Power
LED lighting has the potential to offer very high reliability, with lifetimes forecast to be 50,000 hours or more of continuous operation. In order to achieve this potential the LEDs must be properly managed both thermally and electrically, and in particular the power supply must offer reliability at least as good as the LEDs themselves. This White Paper examines the issues involved in achieving high reliability LED power.
Content
Introduction - Power supply complexity
Background - Reliability and Lifetime
- Reliability calculation
- Temperature
Designing for Reliability
- Corporate Philosophy
- Design Process
- Component Selection and Derating
- Component and material qualification
- PCB material and component placement
- Thermal analysis, simulation and mapping
- AC surge protection
- High temperature, long life E-caps
- Removal of E-caps
- Ingress protection - water, dust
- Ingress protection techniques
Design verification testing
- HALT test and design improvement
- Statistical Data Analysis
Conclusion
Appendix I - Abbreviations
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