PIC16F785的降压 - 升压型LED驱动器

Thisapplicationnotepresentsthedesignequations,

schematicsandsourcecodefora5.5WpowerLED

driverusingthePIC16F785MCU.Theapplication,as

shown,canbeconnectedtooperateasabuck-boost

converteroraboostconverter.

ThePIC16F785makesagreatchoiceforthis

applicationbecauseitcombinesaMCUwithmanyon-

chipanalogperipherals.Thisapplicationissimilarto

thecircuitdescribedinMicrochip’sapplicationnote

AN874andyoucanrefertothisdocumentformore

designinformation.Thisapplicationnotebuildsonthe

applicationdescribedinAN874andaddsthefollowing

features:AN1047Buck-BoostLEDDriverUsingthePIC16F785MCUAsimplemethodthatcanbeusedtodriveanLEDistoAuthor:StephenBowlinginstallaresistorinseriestolimitthecurrent.AlinearMicrochipTechnologyInc.voltageregulatororopampcircuitcanalsobeconnectedinaconstantcurrentsourceconfiguration.INTRODUCTIONHowever,thesemethodswillnothaveenough