{"id":198947,"date":"2016-09-11T23:00:00","date_gmt":"2016-09-11T23:00:00","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/gestionnaire-dalimentation-30-a-a-resistance-de-mesure-de-courant-integree\/"},"modified":"2016-09-11T23:00:00","modified_gmt":"2016-09-11T23:00:00","slug":"gestionnaire-dalimentation-30-a-a-resistance-de-mesure-de-courant-integree","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/gestionnaire-dalimentation-30-a-a-resistance-de-mesure-de-courant-integree\/","title":{"rendered":"Gestionnaire d&rsquo;alimentation, 30 A, \u00e0 r\u00e9sistance de mesure de courant int\u00e9gr\u00e9e"},"content":{"rendered":"<p align=\"left\">La plupart des circuits int\u00e9gr\u00e9s destin\u00e9s \u00e0 la gestion de l\u2019\u00e9nergie et de l\u2019alimentation utilisent une r\u00e9sistance de mesure de courant externe. Cependant, choisir cette r\u00e9sistance n\u2019est pas une t\u00e2che ais\u00e9e, sp\u00e9cialement lorsqu\u2019il s\u2019agit de courants de forte intensit\u00e9 pour lesquels les r\u00e9sistances de mesure de courant existantes peuvent dissiper trop de puissance, occuper une place importante sur la carte et avoir un gros impact quant \u00e0 la pr\u00e9cision des mesures.<br \/>\nPour pallier ces probl\u00e8mes, ce circuit de gestion d\u2019\u00e9nergie int\u00e8gre une r\u00e9sistance de mesure de courant de 300 \u00b5ohms, compens\u00e9e en temp\u00e9rature. Les utilisateurs disposent alors d\u2019une solution simple de 24 mm<sup>2 <\/sup>qui procure des lectures de mesures de courant d\u2019une pr\u00e9cision pouvant atteindre 1,2% &nbsp;jusqu\u2019\u00e0 \u00b130 A.<\/p>\n<p align=\"left\">Lors de la mesure d\u2019un courant de 30 A \u00e0 pleine \u00e9chelle, la chute de tension dans la r\u00e9sistance de mesure int\u00e9gr\u00e9e est de l\u2019ordre de 9 mV, ce qui r\u00e9duit la dissipation de puissance \u00e0 un 1\/4 W, ou \u00e0 environ 10 mW lors de la mesure d\u2019un rail de 6 A. En plus d\u2019une basse dissipation de puissance, ce circuit pr\u00e9sente une gamme dynamique \u00e9lev\u00e9e gr\u00e2ce \u00e0 son faible d\u00e9calage de z\u00e9ro de seulement 6 mA (ou 1,8 \u00b5V).<\/p>\n<p align=\"left\">Trois CAN Delta Sigma int\u00e9gr\u00e9s et une base de temps pr\u00e9cise (horloge ou quartz), interne ou externe, permettent des mesures pr\u00e9cises de plusieurs param\u00e8tres, incluant courant, tension, puissance, charge, \u00e9nergie, temp\u00e9rature et temps. Toutes les lectures num\u00e9riques, comprenant les valeurs minimales et maximales, sont stock\u00e9es dans des registres accessibles au travers une interface configurable I<sup>2<\/sup>C ou SPI. Lorsque les mesures d\u00e9passent les seuils d\u2019alerte programmables, un signal d\u2019alarme le signifie \u00e0 l\u2019h\u00f4te, ce qui \u00e9limine des interrogations r\u00e9currentes.<\/p>\n<hr \/>\n<p align=\"left\">Ce circuit donne acc\u00e8s \u00e0 tous les param\u00e8tres n\u00e9cessaires \u00e0 la mesure et \u00e0 la gestion des niveaux la consommation d\u2019\u00e9nergie de la carte. Sa gamme de fonctionnement rail-\u00e0-rail est appropri\u00e9e \u00e0 la gestion des niveaux de courant lors de situations de court-circuit ou de coupure \u00e9lectrique.<\/p>\n<p>Encapsul\u00e9 en bo\u00eetier QFN 32 broches de seulement 4 x 6 mm, ce composant est sp\u00e9cifi\u00e9 sur les gammes de temp\u00e9ratures commerciales et industrielles.<\/p>\n<p><a href=\"http:\/\/www.linear.com\/product\/LTC2947\" target=\"_blank\" rel=\"noopener\">www.linear.com\/product\/LTC2947<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour les rails de tension de 0 \u00e0 15 V, Linear Technology vient d\u2019introduire le LTC2947, un gestionnaire d\u2019\u00e9nergie et de puissance 30 A, int\u00e9grant une  r\u00e9sistance de mesure de courant 300 \u00b5ohms pour simplifier les mesures des niveaux d\u2019\u00e9nergie de la carte, et une interface configurable I2C ou SPI. 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