Multi-MHz LED Drivers: Design for Lifetime and Reliability

LED power supply lifetime is often the limiting factor for LED luminaries. This paper presents the design of a 60W electrolytic-free outdoor LED driver operating at multi-MHz switching frequencies which allow minimizing passive components. Lifetime and reliability predictions based on both mathematical models and manufacturer data are integrated into the design process in order to achieve a lifetime above 120000 hours. Results highlight how high switching frequencies can help to increase the power supply lifespan and reliability. Moreover, size reductions of more than 50% are achievable based on comparable commercial LED drivers.