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If a power supply fails, it can disable a system, cause major damage to critical equipment and involve costly downtime and repair. MTBF and MTTF may not be relevant if the selected power supply goes into systems that will only see sporadic use, but when the end product is expected to run 24/7 or be installed into, for example, a life-saving medical device, reliability is very high on a designer’s list of selection criteria. This article considers power supplies with internal electrolytic capacitors and how such a capacitor’s lifetime can be just as important as MTBF and MTTF when predicting system reliability and is designed to foster a better understanding of the information available to buyers looking to select a power supply that will meet the reliability requirements that their application demands.įigure 1: The OF225 AC/DC power supply delivers 225W and has been designed to meet telecomms and industrial applications Moreover, power supply manufacturers use different standards and methodologies to calculate reliability ratings.
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A deeper look into product information reveals acronyms like MTBF (mean time between failure) and MTTF (mean time to failure).