ON Semiconductor Is Now To learn more about onsemi, please visit our website at www.onsemi.com onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba onsemi or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. onsemi reserves the right to make changes at any time to any products or information herein, without notice. The information herein is provided as-is and onsemi makes no warranty, representation or guarantee regarding the accuracy of the information, product features, availability, functionality, or suitability of its products for any particular purpose, nor does onsemi 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 onsemi products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by onsemi. Typical parameters which may be provided in onsemi 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. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi 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 onsemi products for any such unintended or unauthorized application, Buyer shall indemnify and holdo nsemi 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 onsemi was negligent regarding the design or manufacture of the part. onsemi is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. Other names and brands may be claimed as the property of others. FSQ0565RS/RQ Green-Mode Power Switch for Quasi-Resonant Operation FSQ0565RS/RQ Green-Mode Power Switch for Quasi-Resonant Operation - Low EMI and High Efficiency Features Description Optimized for Quasi-Resonant Converters (QRC) A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a Low EMI through Variable Frequency Control and AVS (Alternating Valley Switching) conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated High-Efficiency through Minimum Voltage Switching Pulse-Width Modulation (PWM) controller and Narrow Frequency Variation Range over Wide Load SenseFET specifically designed for quasi-resonant and Input Voltage Variation operation and Alternating Valley Switching (AVS). The Advanced Burst-Mode Operation for Low Standby PWM controller includes an integrated fixed-frequency Power Consumption oscillator, Under-Voltage Lockout (UVLO), Leading- Simple Scheme for Sync Voltage Detection Edge Blanking (LEB), optimized gate driver, internal soft- Pulse-by-Pulse Current Limit start, temperature-compensated precise current sources Various Protection Functions: Overload Protection for a loop compensation, and self-protection circuitry. (OLP), Over-Voltage Protection (OVP), Internal Compared with a discrete MOSFET and PWM controller Thermal Shutdown (TSD) with Hysteresis, solution, the FSQ-series can reduce total cost, Output Short Protection (OSP) component count, size, and weight while simultaneously Under-Voltage Lockout (UVLO) with Hysteresis increasing efficiency, productivity, and system reliability. Internal Startup Circuit This device provides a basic platform for cost-effective Internal High-Voltage Sense FET (650V) designs of quasi-resonant switching flyback converters. Built-in Soft-Start (17.5ms) Applications Power Supply for LCD TV and Monitor, VCR, SVR, STB, and DVD & DVD Recorder Adapter 2008 Semiconductor Components Industries, LLC. Publication Order Number: FSQ0565RS/D October-2017, Rev. 3