{"id":7,"date":"2011-04-15T08:29:50","date_gmt":"2011-04-15T08:29:50","guid":{"rendered":"http:\/\/blog.uk.tdk-lambda.com\/uk\/?p=7"},"modified":"2011-07-20T12:27:52","modified_gmt":"2011-07-20T12:27:52","slug":"goodbye-mtbf-hello-design-life","status":"publish","type":"post","link":"https:\/\/blog.uk.tdk-lambda.com\/uk\/2011\/04\/15\/goodbye-mtbf-hello-design-life\/","title":{"rendered":"Goodbye MTBF  hello Design life"},"content":{"rendered":"<p>In the world of AC-DC power supplies, it\u00a0deeply concerns\u00a0me how many people misunderstand <a title=\"MTBF explained\" href=\"https:\/\/www.emea.lambda.tdk.com\/uk\/public\/kb_glossary_results.aspx?index=m#393\" target=\"_blank\">MTBF<\/a> &#8211; thinking it means product life and\u00a0making design in decisions without qualifying the MTBF numbers on a datasheet. An MTBF of say 100,000 hours may look good but statistically it actually means that 63% will have failed by then !<\/p>\n<p>Users of AC-DC power supplies should be asking manufacturers for detailed information about the design life instead\u00a0&#8211; usually this comes down to the <strong>worst case<\/strong> electrolytic capacitor life under a given set of operating conditions and\/or the fan (if used).\u00a0( I have seen design life calculations from a manufacturer who selected the best case capacitor !)<\/p>\n<p>That assumes, of course, that the basic design is sound, component deratings are adequate, rigorous component qualification methods are employed and extensive design verification testing (DVT) is carried out.<\/p>\n<p>Any reputable power supply manufacturer will be able to provide the information required to support the stated design life .<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the world of AC-DC power supplies, it\u00a0deeply concerns\u00a0me how many people misunderstand MTBF &#8211; thinking it means product life and\u00a0making design in decisions without qualifying the MTBF numbers on a datasheet. An MTBF of say 100,000 hours may look good but statistically it actually means that 63% will have failed by then ! Users [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7","post","type-post","status-publish","format-standard","hentry","category-power-supply-basics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Goodbye MTBF hello Design life  &#171; TDK-Lambda UK Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.uk.tdk-lambda.com\/uk\/2011\/04\/15\/goodbye-mtbf-hello-design-life\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Goodbye MTBF hello Design life  &#171; TDK-Lambda UK Blog\" \/>\n<meta property=\"og:description\" content=\"In the world of AC-DC power supplies, it\u00a0deeply concerns\u00a0me how many people misunderstand MTBF &#8211; thinking it means product life and\u00a0making design in decisions without qualifying the MTBF numbers on a datasheet. 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