{"id":468254,"date":"2024-12-17T19:59:37","date_gmt":"2024-12-17T18:59:37","guid":{"rendered":"https:\/\/www.ecinews.fr\/?p=468254"},"modified":"2024-12-17T19:59:37","modified_gmt":"2024-12-17T18:59:37","slug":"pilote-65v-2a-pour-de-longues-chaines-de-led","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/pilote-65v-2a-pour-de-longues-chaines-de-led\/","title":{"rendered":"Pilote 65V, 2A pour de longues cha\u00eenes de Led"},"content":{"rendered":"

Diodes a lanc\u00e9 un pilote de LED Buck synchrone conforme aux normes automobiles, avec d\u00e9tection de courant c\u00f4t\u00e9 haut, qui permet de piloter jusqu’\u00e0 2A \u00e0 partir d’une large plage de tension d’entr\u00e9e de 4,5V \u00e0 65V.<\/span><\/h3>\n

L’AL8891Q prend en charge jusqu’\u00e0 95 % du cycle de fonctionnement, ce qui permet de piloter de longues cha\u00eenes de LED\u00a0 telles que les feux de jour, les feux antibrouillard, les clignotants, les feux de freinage et d’arr\u00eat, sans oublier les \u00e9clairages int\u00e9rieurs.<\/p>\n

Conformit\u00e9 avec la norme CISPR 25 Class 5.<\/strong><\/p>\n

En utilisant le contr\u00f4le \u00e0 temps constant (COT), l’AL8891Q r\u00e9alise une compensation simple de la boucle de contr\u00f4le et une limitation du courant cycle par cycle avec une r\u00e9ponse transitoire rapide sans n\u00e9cessiter de condensateur de compensation externe. La fr\u00e9quence de commutation du dispositif est r\u00e9glable de 200 kHz \u00e0 2,5 MHz, ce qui permet d’optimiser l’efficacit\u00e9 ou d’obtenir une valeur d’inductance r\u00e9duite et un facteur de forme compact. Il int\u00e8gre une technique de modulation de fr\u00e9quence \u00e0 spectre \u00e9tal\u00e9 pour am\u00e9liorer les performances EMI, pour \u00eatre en conformit\u00e9 avec la norme la plus stricte CISPR 25 Class 5.<\/p>\n

L’AL8891Q poss\u00e8de deux broches ind\u00e9pendantes – PWM et gradation analogique – pour une fonctionnalit\u00e9 am\u00e9lior\u00e9e. La gradation PWM, de 0,1 kHz \u00e0 2 kHz, est adapt\u00e9e \u00e0 la gradation haute r\u00e9solution, et la gradation analogique est de 0,15V \u00e0 2V. Il est dot\u00e9 d’une fonction interne de d\u00e9marrage progressif, qui augmente graduellement le courant de l’inducteur et du commutateur afin de minimiser les risques de surtension et de surintensit\u00e9 \u00e0 la sortie.<\/p>\n

Protection assur\u00e9e<\/strong><\/p>\n

Le dispositif est dot\u00e9 de protections compl\u00e8tes avec signalement des d\u00e9fauts, y compris l’arr\u00eat thermique avec red\u00e9marrage automatique, le verrouillage de sous-tension (UVLO) de l’entr\u00e9e et du courant constant, la limite de courant cycle par cycle, et la protection contre l’ouverture et le court-circuit des DEL, afin d’accro\u00eetre la robustesse du syst\u00e8me.<\/p>\n

Le pilote de LED AL8891Q<\/a> est disponible en bo\u00eetier TSSOP-16EP am\u00e9lior\u00e9 thermiquement, avec une plage de temp\u00e9rature de fonctionnement de -40\u00b0C \u00e0 +125\u00b0C. Il est disponible au prix de 0,78 $ pour des quantit\u00e9s de 1 000 pi\u00e8ces. Une version de conformit\u00e9 standard, AL8891, est disponible et convient aux applications industrielles et commerciales.<\/p>\n

www.diodes.com<\/a><\/p>\n

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

Diodes a lanc\u00e9 un pilote de LED Buck synchrone conforme aux normes automobiles, avec d\u00e9tection de courant c\u00f4t\u00e9 haut, qui permet de piloter jusqu’\u00e0 2A \u00e0 partir d’une large plage de tension d’entr\u00e9e de 4,5V \u00e0 65V. L’AL8891Q prend en charge jusqu’\u00e0 95 % du cycle de fonctionnement, ce qui permet de piloter de longues […]<\/p>\n","protected":false},"author":11,"featured_media":468138,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[1640,4324,892,8486],"domains":[47],"ppma_author":[3640,1143],"class_list":["post-468254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","tag-automobile","tag-eclairage-led","tag-ledlighting-fr","tag-pilotage-led","domains-electronique-eci"],"acf":[],"yoast_head":"Pilote 65V, 2A pour de longues cha\u00eenes de Led ...<\/title>\n<meta name=\"description\" content=\"le pilote de LED Buck synchrone AL8891Q, dot\u00e9 d'une d\u00e9tection de courant c\u00f4t\u00e9 haut pilote jusqu'\u00e0 2A et tension d'entr\u00e9e de 4,5V \u00e0 65V.\" \/>\n<meta name=\"robots\" content=\"index, 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