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Thisreferencedesignisahighefficiency,highpowerfactoranddigitaldimmingelectronicballastdesignedtodriverapidstartfluorescentlamptypes.Thedesigncontainsanactivepowerfactorcorrectioncircuitforuniversalvoltageinputaswellasaballastcontrolcir-cuitusingtheIR2159.ThedesignalsoincludesaPIC16F628microcontrollerandanisolationcircuitforconnectingtoaDigitallyAddressableLightingInterface(DALI).OtherfeaturesincludeEMIfiltering,transientprotectionandlampFAULTprotection.AN809DigitallyAddressableDALIDimmingBallastFIGURE1:DALIDIMMINGBALLASTAuthors:RossFoslerMicrochipTechnologyIncorporatedCeciliaContentiInternationalRectifierTomRibarichInternationalRectifierINTRODUCTIONThisreferencedesignisahighefficiency,highpowerfactoranddigitaldimmingelectronicballastdesignedtodriverapidstartfluorescentlamptypes.Thedesigncontainsanactivepowerfactorcorrectioncircuitforuniversalvoltageinputaswellasaballastcontrolcir-cuitusingtheIR2159.Thedesignalso……