link to page 19 DATA SHEETwww.onsemi.com Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Lightning Controller SOIC−16, 150 milsCASE 751BG−01 FL7921R DescriptionMARKING DIAGRAM The highly integrated FL7921R combines a Power Factor Correction (PFC) controller and a Quasi−Resonant PWM controller. 16 Integration provides cost effect design and allows for fewer external components. ZXYTT For PFC, FL7921R uses a controlled on−time technique to provide a FL7921R regulated DC output voltage and to perform natural power factor TM correction. An innovative THD optimizer reduces input current distortion at zero−crossing duration to improve THD performance. The 1 PFC function is always on regardless of the PWM stage load condition FL7921RMA = Specific Device Code to ensure that high PF can be achieved at light load condition. Z = Plant Code For PWM, FL7921R provides several functions to enhance power X = 1−Digit Year Code system performance: valley detection, green−mode operation, high / Y = 1−Digit Week Code low line over−power compensation. Protection functions include TT = Die−Run Code secondary−side open−loop and over−current with auto−recovery T = Package Type (M = SOP) M = Manufacture Flow Code protection, external recovery triggering, adjustable over−temperature protection through the RT pin and external NTC resistor, internal over−temperature shutdown, VDD pin OVP, DET pin over−voltage for output OVP, and brown−in / out for AC input voltage UVP. All ORDERING INFORMATION protections are auto recovery mode except PWM current sense pin See detailed ordering and shipping information on page 19 of open protection. this data sheet. The FL7921R controller is available in a 16−pin small outline−package (SOP). Features Integrated PFC and Flyback Controller Critical−Mode PFC Controller Zero−Current Detection for PFC Stage Quasi−Resonant Operation for PWM Stage Internal Minimum tOFF 8 ms for QR PWM Stage Internal 10 ms Soft−Start for PWM Brownout Protection High / Low Line Over−Power Compensation Auto Recovery Over−Current Protection Auto Recovery Open−Loop Protection Auto Recovery Over−Temperature Protection Adjustable Over−Temperature with External NTC through the RT Pin Auto Recovery VDD Pin and Output Voltage OVP This is a Pb−Free Device Applications Medium to High Power LED Lighting Driver Application Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: December, 2022 − Rev. 3FL7921R/D
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