标签: pic16hv785

High-brightnessLEDsarefindingtheirwayintomanypopularapplicationsanddesignersarenowchallengedtofindnewandmorecost-effectivewaysofpoweringthem.ManyoftheseapplicationsmustbepoweredbyanACsourcerequiringpowerfactorcorrection,highefficiency,andpossiblyisolationforsafety.Also,designersarelookingforwaystoaddintelligenceintotheirdesign.Often,itisnotenoughtoturnthelightsonandoff.Applicationsneedtosenseinternalandexternalchangesandbeabletorespondintelligentlytothoseevents.ThisapplicationnotedemonstratesasimpleflybacksolutionforanACline-drivenpowerconvertercapableofdrivingmultiplehigh-brightnessLEDs.Microchip’sPIC16HV785microcontrollermanagesthepowersectionoftheconverter.ThesinglechipcontrollersolutionintegratesanalogperipheralswithanMCUandfirmware,which,together,areusedtocreateanintelligentlightingsource.ThePIC16HV785isa20-pinmicrocontrollerunit(MCU)withonboardperipheralsusefulforpowerconverterdesign.TheseincludeAnalog-to-DigitalConverters(ADCs),opamps,comparatorsandAN1271OfflinePowerConverterforHigh-BrightnessLEDsUsingthePIC16HV785MicrocontrollerPulse-WidthModulators(PWMs).OtherperipheralsAuthor:FrankHammerschmidtincludetimers,generalI/Oports,andaprogrammable,MicrochipTechnologyInc.internalvoltagereference.Aninternalshuntregulatorisalsoincludedinthisdevice,makingitparticularlyusefulforhighvoltageapplications.INTRODUCTION……