FL7921R Datasheet | onsemi

Description The highly integrated FL7921R bines a Power Factor Correction (PFC) controller and a Quasi- Resonant PWM controller. Integration provides cost effect design and allows for fewer external ponents. For PFC, FL7921R uses a controlled on- time technique to provide a regulated DC output voltage and to perform natural power factor correction. An innovative THD optimizer reduces input current distortion at zero- crossing duration to improve THD performance. The PFC function is always on regardless of the PWM stage load condition to ensure that high PF can be achieved at light load condition. For PWM, FL7921R provides several functions to enhance power system performance: valley detection, green- mode operation, high / low line over- power pensation. Protection functions include secondary- side open- loop and over- current with auto- recovery 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 protections are auto recovery mode except PWM current sense pin open protection. 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 t OFF 8 ms for QR PWM Stage - Internal 10 ms Soft- Start for PWM - Brownout Protection - High / Low Line Over- Power pensation - 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 DATA SHEET .onsemi. SOIC- 16, 150 mils CASE 751BG- 01 MARKING DIAGRAM 16 ZXYTT...