Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductors system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore ( ), the underscore ( ) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore ( ). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild questions onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. Typical parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customers technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN6921MR Integrated Critical Mode PFC and Quasi-Resonant Current Mode PWM Controller February 2013 FAN6921MR Integrated Critical Mode PFC and Quasi-Resonant Current Mode PWM Controller Features Description The highly integrated FAN6921MR combines Power Integrated PFC and Flyback Controller Factor Correction (PFC) controller and Quasi-Resonant Critical Mode PFC Controller PWM controller. Integration provides cost effect design and allows for fewer external components. Zero-Current Detection for PFC Stage For PFC, FAN6921MR uses a controlled on-time Quasi-Resonant Operation for PWM Stage technique to provide a regulated DC output voltage and Internal Minimum t 8 s for QR PWM Stage OFF to perform natural power factor correction. With an innovative THD optimizer, FAN6921MR can reduce Internal 10 ms Soft-Start for PWM input current distortion at zero-crossing duration to Brownout Protection improve THD performance. High / Low Line Over-Power Compensation For PWM, FAN6921MR provides several functions to enhance the power system performance: valley Auto-Recovery Over-Current Protection detection, green-mode operation, high / low line over Auto-Recovery Open-Loop Protection power compensation. FAN6921MR provides many protection functions as well: secondary-side open-loop Externally Latch Triggering (RT Pin) and over-current with auto recovery protection, external Adjustable Over-Temperature Latched (RT Pin) latch triggering, adjustable over-temperature protection by RT pin and external NTC resistor, internal over- VDD Pin and Output Voltage OVP (Latched) temperature shutdown, V pin OVP, and DET pin over- DD Internal Over-Temperature Shutdown (140C) voltage for output OVP, and brown-in / out for AC input voltage UVP. Applications The FAN6921MR controller is available in a 16-pin small outline package (SOP). AC/DC NB Adapters Open-Frame SMPS Battery Charger Ordering Information OLP Operating Packing Part Number Package Mode Temperature Range Method -40C to +105C 16-Pin Small Outline Package (SOP) FAN6921MRMY Recovery Tape & Reel 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN6921MR Rev. 1.0.4