\nInductance “rolls off” with increasing current and the way this happens depends on the material:\n<\/p>\n
\nIron powder, molybdenum permalloy powder (MPP), sendust and amorphous powder that employ a distributed air gap\n<\/p>\n
\nInductance roll off starts at very low current levels and continues in an almost linear manner as the current is increased.\n<\/p>\n
\nThe peak current could be specified at anything up to a 50% roll off with operation beyond this being possible provided the inductor is not overheated.\n<\/p>\n
\nFerrite material\n<\/p>\n
\nThe inductance falls sharply at the point where the whole core becomes saturated. Before this point is reached, the inductance remains almost constant.\n<\/p>\n
\nThe peak current would normally be specified for a 10% to 30% reduction in inductance from the open circuit value. Operation at higher current levels are not recommended, as the inductance would quickly fall to a low level.\n<\/p>\n
\nLook at datasheet roll off curves when selecting inductors.\n<\/p>\n
\n \n<\/p>\n
\nInductors are normally specified with two current ratings\n<\/p>\n
\nContinuous (Irms)\n<\/p>\n
\nNormally specified as the dc current which produces an inductor temperature rise of 40°C (allows for an ambient temperature of 85ºC and therefore a surface temperature of 125ºC).\n<\/p>\n
\nPeak (Isat)\n<\/p>\n
\nThe peak current which produces a specific roll off in inductance, specified as a percentage reduction from the open circuit value and can vary from 5% to 50%.\n<\/p>\n
\nThese current ratings are a guide to the inductor performance and the actual maximum operating current will depend on the application.\n<\/p>\n
\n <\/p>\n","protected":false},"excerpt":{"rendered":"
Inductance Inductance “rolls off” with increasing current and the way this happens depends on the material: Iron powder, molybdenum permalloy powder (MPP), sendust and amorphous powder that employ a distributed air gap Inductance roll off starts at very low current levels and continues in an almost linear manner as the current is increased. The peak […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89],"tags":[],"class_list":["post-1447","post","type-post","status-publish","format-standard","hentry","category-inductors"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1447","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/comments?post=1447"}],"version-history":[{"count":4,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1447\/revisions"}],"predecessor-version":[{"id":1449,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/1447\/revisions\/1449"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/media?parent=1447"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/categories?post=1447"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/tags?post=1447"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}