{"id":459403,"date":"2024-09-02T10:00:12","date_gmt":"2024-09-02T08:00:12","guid":{"rendered":"https:\/\/www.ecinews.fr\/?p=459403"},"modified":"2024-08-29T19:42:47","modified_gmt":"2024-08-29T17:42:47","slug":"pilote-de-led-a-12-canaux-permettant-des-performances-superieures-pour-les-enseignes-et-affichages-numeriques","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/pilote-de-led-a-12-canaux-permettant-des-performances-superieures-pour-les-enseignes-et-affichages-numeriques\/","title":{"rendered":"Pilote de LED \u00e0 12 canaux permettant des performances sup\u00e9rieures pour les enseignes et affichages num\u00e9riques"},"content":{"rendered":"<h3>Le pilote de LED \u00e0 courant constant \u00e0 12 canaux <a href=\"https:\/\/www.diodes.com\/part\/AL58221\">AL58221<\/a> de Diodes Incorporated (Diodes) dispose de 12 sorties \u00e0 drain ouvert pouvant supporter jusqu\u2019\u00e0 24V et absorber jusqu\u2019\u00e0 60mA de courant avec une r\u00e9ponse transitoire rapide.<\/h3>\n<p>La pr\u00e9cision du courant LED de canal \u00e0 canal est typiquement de \u00b11% et la tol\u00e9rance du courant de sortie r\u00e9gul\u00e9 est de \u00b10,1%.<\/p>\n<p>Fonctionnant avec une entr\u00e9e de 3V \u00e0 5,5V, le pilote utilise la modulation adaptative de densit\u00e9 d\u2019impulsions (APDM) pour att\u00e9nuer la distorsion IOUT non id\u00e9ale et am\u00e9liorer les taux de rafra\u00eechissement visuel pour des performances accrues. Il peut \u00eatre utilis\u00e9 pour les enseignes et affichages vid\u00e9o LED int\u00e9rieurs et ext\u00e9rieurs, les panneaux de signalisation \u00e0 messages variables (VMS), les syst\u00e8mes d\u2019\u00e9clairage LED architecturaux et d\u00e9coratifs, et le r\u00e9tro\u00e9clairage LCD.<\/p>\n<p>Le courant LED de l\u2019AL58221 est r\u00e9gl\u00e9 par trois r\u00e9sistances externes (pour le r\u00e9glage ma\u00eetre RGB), chaque canal ayant son courant de sortie moyen programm\u00e9 ind\u00e9pendamment via son interface num\u00e9rique. Il dispose d\u2019une entr\u00e9e d\u2019horloge de donn\u00e9es d\u00e9clench\u00e9e sur double front de 10MHz qui r\u00e9duit les EMI. L\u2019interface s\u00e9rie \u00e0 deux fils de l\u2019appareil envoie des donn\u00e9es en niveaux de gris aux registres de contr\u00f4le de fonction qui stockent les informations de configuration. Elle contr\u00f4le la r\u00e9solution en niveaux de gris et la fr\u00e9quence d\u2019horloge, la s\u00e9lection de la forme d\u2019onde de sortie de courant et la fonction de verrouillage interne.<\/p>\n<p>Le pilote utilise l\u2019APDM pour augmenter le taux de rafra\u00eechissement visuel \u00e0 plus de 1 000 Hz en 16 bits et \u00e0 plus de 256 kHz en niveaux de gris 8 bits. Cette technique r\u00e9duit le scintillement et fournit un traitement bilat\u00e9ral du courant de sortie pour la r\u00e9duction des EMI. L\u2019AL58221 utilise une technique de r\u00e9cup\u00e9ration de cycle d\u2019horloge avec retiming des impulsions pour prendre en charge une connexion \u00e0 plus longue distance. Son interface s\u00e9rie \u00e0 deux fils permet \u00e9galement des applications en cascade pour jusqu\u2019\u00e0 1 030 appareils.<\/p>\n<p>Dans la m\u00eame famille de pilotes de LED, l\u2019AL58263 r\u00e9cemment introduit est un appareil \u00e0 16 canaux avec contr\u00f4le de gradation en niveaux de gris PWM 16 bits pour des applications de panneaux d\u2019affichage de plus haute r\u00e9solution et de plus grande taille.<\/p>\n<p><a href=\"https:\/\/www.diodes.com\/\">Diodes Incorporated<\/a><\/p>\n<p><a href=\"https:\/\/news.google.com\/publications\/CAAqBwgKMJbcwQswuPfYAw?hl=fr&amp;gl=BE&amp;ceid=BE:fr\">Suivre ECInews sur Google news<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le pilote de LED \u00e0 courant constant \u00e0 12 canaux AL58221 de Diodes Incorporated (Diodes) dispose de 12 sorties \u00e0 drain ouvert pouvant supporter jusqu\u2019\u00e0 24V et absorber jusqu\u2019\u00e0 60mA de courant avec une r\u00e9ponse transitoire rapide. La pr\u00e9cision du courant LED de canal \u00e0 canal est typiquement de \u00b11% et la tol\u00e9rance du courant [&hellip;]<\/p>\n","protected":false},"author":39,"featured_media":459450,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[7485],"domains":[47],"ppma_author":[6113],"class_list":["post-459403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","tag-pilote-de-led","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Pilote de LED \u00e0 12 canaux permettant des performances sup\u00e9rie...<\/title>\n<meta name=\"description\" content=\"Le pilote de LED \u00e0 courant constant \u00e0 12 canaux AL58221 de Diodes Incorporated (Diodes) dispose de 12 sorties \u00e0 drain ouvert pouvant supporter jusqu\u2019\u00e0...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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