{"id":131350,"date":"2018-02-06T08:00:44","date_gmt":"2018-02-06T08:00:44","guid":{"rendered":"https:\/\/\/controleur-dc-dc-synchrone-sortie-triple\/"},"modified":"2018-02-06T08:00:44","modified_gmt":"2018-02-06T08:00:44","slug":"controleur-dc-dc-synchrone-sortie-triple","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/controleur-dc-dc-synchrone-sortie-triple\/","title":{"rendered":"Contr\u00f4leur DC\/DC, synchrone, sortie triple"},"content":{"rendered":"<p>Le convertisseur \u00e9l\u00e9vateur synchrone, de rendement \u00e9lev\u00e9, alimente les deux convertisseurs abaisseurs, ce qui \u00e9vite la chute de tension de sortie lorsque la tension de la batterie chute, une caract\u00e9ristique utile pour les syst\u00e8mes de d\u00e9marrage\/arr\u00eat de l\u2019automobile qui coupent le moteur \u00e0 l\u2019arr\u00eat pour \u00e9conomiser du carburant. Parall\u00e8lement, les contr\u00f4leurs abaisseurs peuvent \u00eatre aliment\u00e9s \u00e0 partir de l\u2019entr\u00e9e pour un contr\u00f4leur \u00e0 sortie triple polyvalent. &nbsp;<\/p>\n<p>Le LTC7815 fonctionne sur une tension d\u2019entr\u00e9e de 4.5V \u00e0 38V lors du d\u00e9marrage et maintient le fonctionnement jusqu\u2019\u00e0 2.5V apr\u00e8s le d\u00e9marrage. Le convertisseur \u00e9l\u00e9vateur synchrone peut g\u00e9n\u00e9rer des tensions de sortie jusqu\u2019\u00e0 60V et peut fonctionner avec le commutateur synchrone sur ON avec un rapport cyclique de100% pour que la tension de sortie s\u2019aligne sur la tension d\u2019entr\u00e9e, lorsqu\u2019il est important de r\u00e9duire le bruit et maximiser le rendement. Les deux convertisseurs abaisseurs peuvent g\u00e9n\u00e9rer des tensions de sorties de 0.8V \u00e0 24V, le syst\u00e8me entier r\u00e9alisant un rendement aussi \u00e9lev\u00e9 que 95%. Sa dur\u00e9e de conduction de 45ns minimum permet des rapports de conversion \u00e9lev\u00e9s en commutant \u00e0 2MHz, \u00e9vitant les bandes de fr\u00e9quences sensibles au bruit comme la bande radio AM et permet l\u2019emploi de composants externes plus petits.<\/p>\n<p>Le LTC7815 peut \u00eatre configur\u00e9 pour fonctionner en Burst Mode, ce qui r\u00e9duit le courant de repos \u00e0 28\u03bcA par canal (38\u03bcA les trois \u00e9tant actifs) lors d\u2019une r\u00e9gulation de la tension de sortie \u00e0 vide, une caract\u00e9ristique utile pour maintenir les dur\u00e9es de fonctionnement de batteries dans les syst\u00e8mes toujours connect\u00e9s. Les puissants contr\u00f4leurs de grille int\u00e9gr\u00e9s des MOSFET canal N, 1.1\u2126 minimisent les pertes de commutation et g\u00e9n\u00e8rent un courant de sortie de plus de 10 amp\u00e8res par canal, limit\u00e9 uniquement par les composants externes. De plus, le courant de sortie de chaque convertisseur est mesur\u00e9 par la chute de tension dans l\u2019inductance (DCR) ou en utilisant une r\u00e9sistance de mesure de courant distincte. L\u2019architecture \u00e0 mode courant et fr\u00e9quence fixe du LTC7815 permet de s\u00e9lectionner la fr\u00e9quence de 320kHz \u00e0 2.25MHz. Le composant peut \u00e9galement \u00eatre synchronis\u00e9 \u00e0 une horloge externe sur la m\u00eame plage de fr\u00e9quence.<\/p>\n<p>Les caract\u00e9ristiques suppl\u00e9mentaires comprennent un r\u00e9gulateur LDO int\u00e9gr\u00e9 pour l\u2019alimentation du circuit int\u00e9gr\u00e9 et le contr\u00f4le de grille, le suivi de la tension de sortie et le r\u00e9glage du d\u00e9marrage progressif, un signal de tension r\u00e9gul\u00e9e et une entr\u00e9e V<sub>CC<\/sub> externe<sub>. <\/sub>La pr\u00e9cision de la r\u00e9f\u00e9rence de tension est de \u00b11% sur la plage de la temp\u00e9rature de fonctionnement de \u201340\u00b0C \u00e0 125\u00b0C.<\/p>\n<p><a href=\"http:\/\/www.linear.com\/product\/LTC7815?adicid=PRLS_EU_P58177\">www.linear.com\/product\/LTC7815<\/a>.<\/p>\n<h3 class=\"title\"><a href=\"http:\/\/www.electronique-eci.com\/news\/melangeur-actif-basse-puissance-7ghz\">M\u00e9langeur actif basse puissance 7GHz<\/a><\/h3>\n<h3 class=\"title\"><a href=\"http:\/\/www.electronique-eci.com\/Learning-center\/un-ampli-op-pour-la-mesure-dun-courant-avec-une-liaison-sans-fil\">Un ampli op pour la mesure d\u2019un courant avec une liaison sans fil<\/a><\/h3>\n<h3 class=\"title\"><a href=\"http:\/\/www.electronique-eci.com\/news\/convertisseur-boost-sepic-inverseur-2mhz-avec-transistor-de-puissance-60v-4a\">Convertisseur Boost \/ SEPIC \/ Inverseur 2MHz avec transistor de puissance 60V, 4A <\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Analog Devices annonce le Power by Linear LTC7815, un contr\u00f4leur DC\/DC, synchrone, \u00e0 trois sorties (abaisseur, abaisseur, \u00e9l\u00e9vateur), haute fr\u00e9quence (jusqu\u2019\u00e0 2.25MHz), qui maintient toutes les tensions de sortie r\u00e9gul\u00e9es dans les conditions d\u2019un d\u00e9marrage \u00e0 froid d\u2019un v\u00e9hicule. La tension d\u2019une batterie 12V peut tomber \u00e0 moins de 4 volts en cas de red\u00e9marrage ou d\u00e9marrage \u00e0 froid, provoquant la r\u00e9initialisation des syst\u00e8mes d\u2019info-divertissement et autres syst\u00e8mes \u00e9lectroniques qui fonctionnent de 5 volts \u00e0 plus.<\/p>\n","protected":false},"author":9,"featured_media":131351,"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-131350","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Contr\u00f4leur DC\/DC, synchrone, sortie triple ...<\/title>\n<meta name=\"description\" content=\"Analog Devices annonce le Power by Linear LTC7815, un contr\u00f4leur DC\/DC, synchrone, \u00e0 trois sorties (abaisseur, abaisseur, \u00e9l\u00e9vateur), haute fr\u00e9quence...\" \/>\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\/131350\/\" \/>\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, synchrone, sortie triple\" \/>\n<meta property=\"og:description\" content=\"Analog Devices annonce le Power by Linear LTC7815, un contr\u00f4leur DC\/DC, synchrone, \u00e0 trois sorties (abaisseur, abaisseur, \u00e9l\u00e9vateur), haute fr\u00e9quence (jusqu\u2019\u00e0 2.25MHz), qui maintient toutes les tensions de sortie r\u00e9gul\u00e9es dans les conditions d\u2019un d\u00e9marrage \u00e0 froid d\u2019un v\u00e9hicule. La tension d\u2019une batterie 12V peut tomber \u00e0 moins de 4 volts en cas de red\u00e9marrage ou d\u00e9marrage \u00e0 froid, provoquant la r\u00e9initialisation des syst\u00e8mes d\u2019info-divertissement et autres syst\u00e8mes \u00e9lectroniques qui fonctionnent de 5 volts \u00e0 plus.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/131350\/\" \/>\n<meta property=\"og:site_name\" content=\"EENewsEurope\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-06T08:00:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ecinews.fr\/wp-content\/uploads\/import\/default\/files\/sites\/default\/files\/images\/eci6165_ltc7815.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1964\" \/>\n\t<meta property=\"og:image:height\" content=\"1403\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Alain Dieul\" \/>\n<meta name=\"twitter:card\" 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