{"id":4495,"date":"2018-01-29T10:11:55","date_gmt":"2018-01-29T09:11:55","guid":{"rendered":"http:\/\/www.shincommunication.com\/?p=4495"},"modified":"2018-01-29T10:12:23","modified_gmt":"2018-01-29T09:12:23","slug":"controllore-dcdc-sincrono-a-tripla-uscita-buckbuckboost-funziona-fino-a-225mhz-in-sistemi-startstop-per-automotive-con-iq-di-28%ce%bca","status":"publish","type":"post","link":"https:\/\/www.shincommunication.com\/fr\/controllore-dcdc-sincrono-a-tripla-uscita-buckbuckboost-funziona-fino-a-225mhz-in-sistemi-startstop-per-automotive-con-iq-di-28%ce%bca\/","title":{"rendered":"Controllore DC\/DC sincrono a tripla uscita buck\/buck\/boost,  funziona fino a 2,25MHz in sistemi start\/stop per automotive  con IQ di 28\u03bcA"},"content":{"rendered":"<div style=\"background-repeat: no-repeat;\"><p><a href=\"http:\/\/www.analog.com\/?adicid=PRLS_EU_P58177\">Analog Devices <\/a>annuncia l\u2019<a href=\"http:\/\/www.linear.com\/product\/LTC7815?adicid=PRLS_EU_P58177\">LTC7815<\/a> Power by Linear\u2122, un controllore sincrono DC\/DC ad alta frequenza (fino a 2,25MHz), tripla uscita (buck, buck, boost) in grado di mantenere stabili tutte le tensioni in uscita durante l\u2019avviamento a freddo dei veicoli. Durante il riavvio o l\u2019avviamento a freddo del motore, la tensione della batteria a 12V di una vettura pu\u00f2 scendere fino a valori inferiori a 4 Volt, provocando il reset dei sistemi di infotainment e di altre dotazioni elettroniche di bordo che funzionano con tensioni di 5V o superiori. Il convertitore boost sincrono ad alta efficienza alimenta i due convertitori step-down, evitando cadute nella tensione di uscita durante gli abbassamenti di tensione della batteria, una caratteristica particolarmente utile nei sistemi di start\/stop dei veicoli che spengono il motore durante le attese per risparmiare carburante. In alternativa, i controllori buck possono essere alimentati direttamente dall\u2019ingresso, ottenendo cos\u00ec un controllore a tripla uscita configurato per impieghi generici.<\/p>\n<p><a href=\"http:\/\/www.shincommunication.com\/wp-content\/uploads\/2018\/01\/7815.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4496\" alt=\"7815\" src=\"http:\/\/www.shincommunication.com\/wp-content\/uploads\/2018\/01\/7815-300x214.jpg\" width=\"300\" height=\"214\" srcset=\"https:\/\/www.shincommunication.com\/wp-content\/uploads\/2018\/01\/7815-300x214.jpg 300w, https:\/\/www.shincommunication.com\/wp-content\/uploads\/2018\/01\/7815.jpg 630w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><!--more--><\/p>\n<ul>\n<li>Visitando la pagina di prodotto dell\u2019LTC7815, potrete scaricare la documentazione, ordinare campioni e schede di valutazione: <a href=\"http:\/\/www.linear.com\/product\/LTC7815?adicid=PRLS_EU_P58177\">www.linear.com\/product\/LTC7815<\/a><\/li>\n<\/ul>\n<p>L\u2019LTC7815 funziona con tensioni d\u2019ingresso da 4,5V a 38V durante la fase di start-up, al termine della quale rimane operativo fino a 2,5V. Il convertitore boost sincrono pu\u00f2 generare tensioni in uscita fino a 60V ed \u00e8 in grado di operare con lo switch sincrono completamente ON, al 100% del duty cycle, trasferendo direttamente la tensione d\u2019ingresso quando \u00e8 alta, riducendo il rumore e massimizzando l\u2019efficienza.<\/p>\n<p>I due convertitori step-down sono in grado di generare tensioni in uscita da 0,8V a 24V, con un valore d\u2019efficienza dell\u2019intero sistema che raggiunge il 95%. Il tempo minimo di ON, di soli 45 ns alla frequenza di 2MHz, permette di raggiungere elevati rapporti di conversione in step-down, evitando le bande di frequenza critiche, sensibili alle interferenze, come le AM e richiedendo un ridotto numero di componenti esterni.<\/p>\n<p>L\u2019LTC7815 pu\u00f2 essere configurato per il funzionamento in Burst Mode<sup>\u00ae<\/sup>, riducendo la corrente a riposo fino a 28\u03bcA per canale (38\u03bcA con i tre canali in funzione) mentre regola la tensione in uscita in assenza di carico; una caratteristica utile per preservare la carica della batteria nei sistemi always-on. Il potente gate driver, interamente a MOSFET a canale-N da 1,1\u2126, riduce al minimo le perdite da commutazione e fornisce una corrente in uscita superiore a 10A per canale, limitata esclusivamente da componenti esterni. Inoltre, la corrente in uscita da ciascun convertitore viene monitorata misurando la caduta di tensione ai capi dell\u2019induttore (DCR) oppure utilizzando una resistenza di sense separata. L\u2019architettura a frequenza fissa a controllo di corrente dell\u2019LTC7815 permette la scelta di frequenze da 320kHz a 2,25MHz, oppure pu\u00f2 essere sincronizzata con un clock esterno nel medesimo intervallo.<\/p>\n<p>Ulteriori caratteristiche includono un LDO interno per l\u2019alimentazione dell\u2019IC e del gate drive, funzione di tracking della tensione in uscita o soft-start regolabile, un segnale di \u201cpower good\u201d e un ingresso per V<sub>CC<\/sub> esterna. L\u2019accuratezza della tensione di riferimento \u00e8 di \u00b11% sull\u2019intervallo operativo di temperatura tra \u201340\u00b0C e 125\u00b0C.<\/p>\n<p>L\u2019LTC7815 \u00e8 disponibile in package QFN da 38-pin di 5mm x 7mm.\u00a0 Sono disponibili due intervalli termici di funzionamento, da \u201340 a 125\u00b0C per i gradi industriale ed esteso e la versione automotive per alte temperature da \u201340\u00b0C a 150\u00b0C. Per ulteriori informazioni, visitate il sito <a href=\"http:\/\/www.linear.com\/product\/LTC7815?adicid=PRLS_EU_P58177\">www.linear.com\/product\/LTC7815<\/a>.<\/p>\n<p><strong>Riepilogo delle caratteristiche: LTC7815<\/strong><\/p>\n<ul>\n<li>Doppio controllore Buck pi\u00f9 singolo controllore Boost sincroni<\/li>\n<li>Ampio intervallo di V<sub>IN<\/sub> da 4,5V a 38V durante lo Start-Up, successivamente fino a 2,5V<\/li>\n<li>Basso assorbimento a vuoto di soli 28\u03bcA<\/li>\n<li>Tensione di Boost in uscita fino a 60V<\/li>\n<li>Possibilit\u00e0 di Duty Cycle al 100% per il MOSFET di Boost sincrono<\/li>\n<li>Tensioni V<sub>OUT<\/sub> Buck da 0,8V a 24V<\/li>\n<li>Frequenza di commutazione fissa da 320kHz a 2,25MHz<\/li>\n<li>Sincronizzabile da 320kHz a 2,25MHz<\/li>\n<li>Efficienza fino al 95%<\/li>\n<li>Potenti gate driver interamente a MOSFET a canale-N<\/li>\n<li>Sense di corrente con R<sub>SENSE<\/sub> o DCR<\/li>\n<li>Tracking della tensione in uscita o Soft-Start regolabile<\/li>\n<\/ul>\n<p><strong>Prezzi e disponibilit\u00e0<\/strong><\/p>\n<p><a href=\"http:\/\/www.linear.com\/product\/LTC7815?adicid=PRLS_EU_P58177\">LTC7815<\/a> \u00e8 gi\u00e0 disponibile in un package QFN di 5mm x 7mm a partire da 4.35$ per mille unit\u00e0.<\/p>\n<\/div><div style=\"padding-bottom:20px; padding-top:10px;\" class=\"hupso-share-buttons\"><!-- Hupso Share Buttons - 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