{"id":114396,"date":"2018-07-26T22:31:44","date_gmt":"2018-07-26T22:31:44","guid":{"rendered":"https:\/\/\/controleur-dc-dc-mode-abaisseur-150v-consommant-seulement-9%c2%b5a\/"},"modified":"2018-07-26T22:31:44","modified_gmt":"2018-07-26T22:31:44","slug":"controleur-dc-dc-mode-abaisseur-150v-consommant-seulement-9%c2%b5a","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/controleur-dc-dc-mode-abaisseur-150v-consommant-seulement-9%c2%b5a\/","title":{"rendered":"Contr\u00f4leur DC\/DC, mode abaisseur, 150V, consommant seulement 9\u00b5A"},"content":{"rendered":"

Les caract\u00e9ristiques du LTC3894, comme la possibilit\u00e9 d\u2019un rapport cyclique de 100% et d\u2019une fen\u00eatre de tension de sortie r\u00e9gul\u00e9e, programmable ext\u00e9rieurement,sont appropri\u00e9es \u00e0 une utilisation dans les syst\u00e8mes aliment\u00e9s sur batterie qui fonctionnent constamment avec une faible chute de tension. Le LTC3894 convient aux syst\u00e8mes du transport, et aux applications,toujours en veille, du contr\u00f4le industriel, de la robotique et des transmissions de donn\u00e9es.<\/p>\n

Le LTC3894 contr\u00f4le un \u00e9tage de puissance \u00e0 MOSFET canal P et peut g\u00e9n\u00e9rer une tension de sortie de 0,8V \u00e0 60V, pour des courants pouvant atteindre 3A et un rendement aussi \u00e9lev\u00e9 que 92%. Le LTC3894 pr\u00e9sente l\u2019option d\u2019un transistor de contr\u00f4le FET canal N externe pour fournir le courant au contr\u00f4leur de grille PMOS dans les applications de forte puissance et de tension \u00e9lev\u00e9e. <\/p>\n

Le LTC3894 fonctionne \u00e0 une fr\u00e9quence fixe pouvant \u00eatre s\u00e9lectionn\u00e9e entre 50kHz et 850kHz, et il peut \u00eatre synchronis\u00e9 \u00e0 une horloge externe de 75kHz \u00e0 800kHz. L\u2019utilisateur peut choisir le mode de fonctionnement entre le mode par saut d\u2019impulsions ou le Burst Mode, pour les faibles charges. Son architecture en mode courant procure une compensation de boucle facile, une r\u00e9ponse rapide aux transitoires et une excellente r\u00e9gulation de ligne. La mesure du courant est r\u00e9alis\u00e9e en mesurant la chute de tension aux bornes de l\u2019inductance de sortie (DCR), pour le meilleur rendement, ou aux bornes d\u2019une r\u00e9sistance de mesure de courant en option. Une faible dur\u00e9e de conduction minimum de 100ns permet d\u2019importants rapports de conversion, en mode abaisseur, \u00e0 une fr\u00e9quence de d\u00e9coupage \u00e9lev\u00e9e. Le mode par repliement de caract\u00e9ristique du courant limite la dissipation de chaleur du MOSFET en cas de surcharges. Les caract\u00e9ristiques suppl\u00e9mentaires comprennent un indicateur de tension de sortie \u00e9tablie, le r\u00e9glage du niveau de tension d\u2019entr\u00e9e de blocage en cas de surtensions et un d\u00e9marrage progressif.  <\/p>\n

Le LTC3894 est disponible en un bo\u00eetier TSSOP de 16 broches, \u00e0 performances thermiques renforc\u00e9es, avec espacement des broches pour les tensions \u00e9lev\u00e9es. Les versions de classes industrielles et \u00e0 plage de temp\u00e9ratures \u00e9tendue, fonctionnant de -40\u00b0C \u00e0 125\u00b0C, sont disponibles. <\/p>\n

www.analog.com\/LTC3894<\/a>.<\/p>\n

R\u00e9gulateur \u00b5Module parfait pour le contr\u00f4le des LED<\/a><\/h3>\n

R\u00e9gulateur abaisseur, synchrone avec rendement de 95% \u00e0 2MHz<\/a><\/h3>\n

Un module optique pour r\u00e9duire les fausses alarmes g\u00e9n\u00e9r\u00e9es par les d\u00e9tecteurs de fum\u00e9e<\/a><\/h3>\n

Synth\u00e9tiseur PLL avec oscillateur command\u00e9 en tension<\/a><\/h3>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Analog Devices annonce le LTC3894, de Power by Linear, un contr\u00f4leur DC\/DC, haute tension, mode abaisseur, qui consomme un courant de repos de seulement 9\u00b5A, la sortie \u00e9tant activ\u00e9e pour fonctionner en Burst Mode. Sa plage de tension d\u2019entr\u00e9e \u00e9tendue, de 4,5V \u00e0 150V, permet de se passer de composants de suppression des surtensions.<\/p>\n","protected":false},"author":9,"featured_media":114397,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[],"domains":[47],"ppma_author":[1141],"class_list":["post-114396","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","domains-electronique-eci"],"acf":[],"yoast_head":"Contr\u00f4leur DC\/DC, mode abaisseur, 150V, consommant seulement 9...<\/title>\n<meta name=\"description\" content=\"Analog Devices annonce le LTC3894, de Power by Linear, un contr\u00f4leur DC\/DC, haute tension, mode abaisseur, qui consomme un courant de repos de seulement...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/114396\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contr\u00f4leur DC\/DC, mode abaisseur, 150V, consommant seulement 9\u00b5A\" \/>\n<meta property=\"og:description\" content=\"Analog Devices annonce le LTC3894, de Power by Linear, un contr\u00f4leur DC\/DC, haute tension, mode abaisseur, qui consomme un courant de repos de seulement 9\u00b5A, la sortie \u00e9tant activ\u00e9e pour fonctionner en Burst Mode. 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