Vim yog VF tus yam ntxwv ntawmLEDs, qee qhov VF qhov tseem ceeb yuav hloov nrog qhov kub thiab qhov tam sim no, uas feem ntau tsis haum rau kev tsim qauv. Txawm li cas los xij, hauv qee kis, peb yuav tsum daws qhov teeb meem ntawm kev tsav tsheb tus nqi ntawm ntau lub LEDs nyob rau tib lub sijhawm. Cov qauv no tuaj yeem siv rau kev siv.

Nco ntsoov tias tus nqi VF yuav tsum tau muab faib ua qib. LEDs nrog tus nqi VF tib yam yuav tsum tau siv rau tib yam khoom kom deb li deb tau. Cov khoom lag luam tuaj yeem ua kom ntseeg tau tias qhov yuam kev tam sim no nyob rau hauv 1mA thiab LED yog nyob rau hauv lub xeev tam sim no.

Kev siv cov triodes sib xyaw ua ke tuaj yeem khaws qhov tam sim no ntawm txhua tusLED zoo ib yam. Cov triodes no yog tsim nyob rau hauv tib qhov kub thiab txias ib puag ncig thiab cov txheej txheem tib yam β Tus nqi tib yam tuaj yeem ua kom ntseeg tau tias txhua qhov tam sim no yeej zoo ib yam. Qhov tsis tu ncua tam sim no tuaj yeem tsim nyob rau hauv txoj kev no thaum cov kev xav tau tsis siab heev. Ib qho hluav taws xob ruaj khov lossis PWM ruaj khov tus nqi tsav lub stabilized triode bias voltage kom ua tiav qhov yooj yim tam sim no.

Siv IC nrog qhov tseeb siab raws li qhov kev siv tam sim no, R tuaj yeem teeb tsa IC tso zis tam sim no. Thaum tus nqi ntawm R tsis kam raug txiav txim siab, nws tuaj yeem hloov tau los ntawm kev ruaj khov. Kev siv cov khoom siv sib xyaw triode tuaj yeem txo kev siv IC, yog li txo tus nqi ntawm cov khoom tsim.

Linear high-power LED qhov tso zis tam sim no tuaj yeem siv ua ke. Hauv kev tsim khoom, peb feem ntau tsis tuaj yeem nrhiav tau tsav IC nrog tam sim no loj. Feem ntau, nws tsis tshua pom IC nrog lub npe 2A lossis siab dua, thiab IC nrog lub npe 2A yuav tsis siv rau qhov txwv. Yog vim li cas rau tus nqi ntawm IC txheej txheem ntau dua 1a yog tias MOS hlab yog sab nraud, thiab sab nraud MOS raj Circuit Court yog qhov nyuaj thiab kev ntseeg tau raug txo. Kev ua haujlwm sib luag yog ib txoj hauv kev tsim qauv zoo.

Dd312 parallel reference design yog saws los ncaj qha tsav peb 6wled. Ua kom PWM tswj cov teeb liab yuav tsum muaj kev sib cais kom raug kom tsis txhob muaj kev cuam tshuam kev sib koom tes thiab teeb meem kev tsav tsheb. Lub enabling voltage yuav tsum tau raws li qhov yuav tsum tau ntawm cov specification, thiab tsis txhob ua puas lub EN tus pin siab heev. Feem ntau, IC tiv taus voltage yog hais txog kev thauj khoom thiab lub zog hluav taws xob. Yog tias tsis muaj qhov qhia tau hais tias qhov hluav taws xob excitation, thov tsis txhob tshaj 5V tsim.

Rau hom kev tshawb nrhiav no, lubLED tsis tu ncuatam sim no tsav IC ntawm ib qho kawg ntawm LED kuj tuaj yeem tsim thiab tsav ua ke. Qhov tseeb, IC ua haujlwm ib leeg thiab thaum kawg ua haujlwm ua ke ua ke. DC-DC hom ua haujlwm ntawm ntau zaus. Nws yuav tsum tau muab sau tseg tias PCB layout yuav tsum tsis txhob hla tus tsim. Cov lim dej sib txawv thiab cov khoom siv hla dhau yuav tsum nyob ze rau IC, thiab cov khoom thauj tam sim no thaum kawg yuav ua ke.