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FL7921R

ON Semiconductor
Part Number FL7921R
Manufacturer ON Semiconductor
Description PWM Lightning Controller
Published Nov 7, 2022
Detailed Description Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Lightning Controller FL7921R Description The highly int...
Datasheet PDF File FL7921R PDF File

FL7921R
FL7921R

Overview
Integrated Critical-Mode PFC and Quasi-Resonant Current-Mode PWM Lightning Controller FL7921R Description The highly integrated FL7921R combines a Power Factor Correction (PFC) controller and a Quasi−Resonant PWM controller.
Integration provides cost effect design and allows for fewer external components.
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 compensation.
Protection functions include secondary−side open−loop and over−current with auto−recovery protection, external recovery triggering, adjus...


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