I-LT8620EMSE#TRPBF
IZICI
Ibanga Lamandla Kagesi Wokufaka Okubanzi: 3.4V ukuya ku-65V
I-Ultralow Quiscent Current Burst Mode® Ukusebenza:
I-2.5μA IQ Elawula i-12VIN ukuya ku-3.3VOUT
I-Ripple yokuphumayo <10mVP-P
Ukusebenza Kahle Kokuvumelanisa:
94% Ukusebenza kahle ku-1A, 12VIN kuya ku-5VOUT
92% Ukusebenza kahle ku-1A, 12VIN kuya ku-3.3VOUT
I-Fast 30ns Minimum Switch-On Time
Ukuyeka Okuphansi Ngaphansi Kwazo Zonke Izimo: 250mV ku-1A
Ibekezelela Ngokuphephile Ukugcwaliswa Kwe-Inductor Ekulayisheni Okugcwele
I-EMI ephansi
Iyalungiseka futhi Iyavumelaniswa: 200kHz ukuya ku-2.2MHz
I-1V Enembile Ye-Pin Threshold
Isinxephezelo Sangaphakathi
I-Output Soft-Start and Tracking
I-MSOP Ethuthukisiwe Encane engu-16-Lead kanye namaphakheji angu-24-Lead 3mm × 5mm QFN
IZICELO
Izimpahla Zezimoto Nezimboni
Inhloso Ejwayelekile Isinyathelo-Phansi
GSM Power Supplies
DESCRIPTION
I-LT®8620 iyisilawuli esihlangene, esisebenza kahle kakhulu, esihambisana nesivinini esikhulu se-monolithic sokuya phansi esamukela ububanzi bokufaka kagesi obufika ku-65V, futhi sisebenzisa i-2.5µAofquiescent yamanje kuphela.Ukushintsha kwamandla e-Topandbottom kufakwe nawo wonke ama-circuitry adingekayo ukuze kuncishiswe isidingo sezingxenye zangaphandle.Ukusebenza kwemodi ye-Ripple Burst ephansi kuvumela ukusebenza kahle okuphezulu kwehle kuye kuma-currents okukhiphayo aphansi kakhulu kuyilapho kugcina okukhiphayo kungaphansi kuka-10mVP-P.Iphinikhodi yokuvumelanisa ivumela ukuvumelanisa iwashi langaphandle.Isinxephezelo sangaphakathi nge-topology yemodi yamanje ephezulu ivumela ukusetshenziswa kwama-inductors amancane futhi kubangele impendulo yesikhashana esheshayo nokuzinza okuhle kwe-loop.Iphinikhodi ye-EN/UV ine-1V threshold enembile futhi ingasetshenziselwa ukuhlela i-VIN undervoltage lockout noma ukuvala i-LT8620 kunciphisa ukunikezwa kokufakwayo kwamanje ku-1µA.I-capacitor kuphini ye-TR/SS ihlela isilinganiso serempu kagesi ophumayo ngesikhathi sokuqalisa.Ifulegi le-PG libonisa uma i-VOUT ingaphakathi kuka-±9% wevolthi ephumayo ehleliwe kanye nezimo zamaphutha.I-LT8620 itholakala ngamaphakheji amancane angu-16-Lead MSOP kanye ne-3mm×5mmQFNpackage namaphedi avuliwe okumelana nokushisa okuphansi.
I-LT8620 iyisiguquli se-monolithic, imvamisa engaguquki, isiguquli semodi yamanje eyehlayo ye-DC/DC.I-oscillator, ene-frequency set kusetshenziswa i-resistor kuphini ye-RT, ivula iswishi yamandla ephezulu yangaphakathi ekuqaleni komjikelezo wewashi ngamunye.Okwamanje ku-inductor bese ikhuphuka kuze kube yilapho isiqhathanisi samanje seswishi ephezulu sihamba futhi sivale iswishi yamandla ephezulu.I-inductor current ephezulu lapho iswishi ephezulu ivaleka khona ilawulwa i-voltage ku-VC node yangaphakathi.Isikhulisi sephutha sisebenzela inodi ye-VC ngokuqhathanisa amandla kagesi ephinikhodi ye-VFB nereferensi yangaphakathi engu-0.97V.Lapho umthamo wamanje ukhuphuka ubangela ukuncipha kwe-voltage yempendulo ngokuhlobene nereferensi eholela isikhulisi sephutha ukuze sinyuse i-voltage ye-VC kuze kube yilapho i-inductor yamanje ifana nomthwalo wamanje omusha.Uma iswishi yamandla ephezulu ivaliwe, iswishi yamandla evumelanisiwe ivula kuze kube umjikelezo wewashi olandelayo uqala noma i-inductor current iwela kuziro.Uma izimo zokugcwala ngokweqile ziphumela ekugelezeni okungaphezu kuka-3.9A kuswishi engezansi, umjikelezo wewashi olandelayo uzobambezeleka kuze kube yilapho ukushintsha kwamandla kubuyela kuleveli ephephile.
Uhlolojikelele
I-LT3650 iyishaja ephelele ye-monolithic, amandla aphakathi nendawo, i-Li-Ionbattery, ebhekana nezinhlelo zokusebenza zamandla kagesi okufakwayo aphezulu enezixazululo ezisebenzisa ubuncane bezingxenye zangaphandle.I-IC isebenzisa i-1MHz-frequency engaguquki, isilinganiso semodi yamanje yesakhiwo sokwehla.
I-LT3650 ihlanganisa ukushintsha kwe-2A eqhutshwa i-bootstrappedsupplytomaximizeefficiency phakathi nemijikelezo yokushaja.Ibanga lokufaka elibanzi livumela umsebenzi ukuthi ushaje ngokugcwele ukusuka ku-9V kuye ku-32V.Iphinikhodi yokuvala i-threshold enembayo ivumela ukufakwa komsebenzi we-UVLO kusetshenziswa isihlukanisi esilula esiphikisayo.I-IC ingaphinda ifakwe kumodi yokuvala shaqa yamanje ephansi, lapho ukuchema kokunikezwayo okokufaka kwehliswa kube ngu-15µA kuphela.
I-LT3650 ihlanganisa amazinga amaningana enkululeko yokulawula yamanje.Isamba esiphezulu sokushaja samanje sisethwa kusetshenziswa isivikeli senzwa samanje se-inductor.Iphinikhodi yohlelo yamanje yokushaja ivumela ukukhohliswa okuguquguqukayo kokushajwa kwebhethri yamanje.I-LT3650 iphinda ihlanganise isici sokulawula umkhawulo wokunikezwayo kokufaka kwesistimu esivumela ukushajwa kwebhethri kwamanje ukuze kuhlangatshezwane nezidingo zomthwalo wesistimu zizonke.
