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Q0765RQ Dataheets PDF



Part Number Q0765RQ
Manufacturers Fairchild Semiconductor
Logo Fairchild Semiconductor
Description FSQ0765RQ
Datasheet Q0765RQ DatasheetQ0765RQ Datasheet (PDF)

FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation April 2009 FSQ0765RQ Green-Mode Fairchild Power Switch (FPS™) for Quasi-Resonant Operation - Low EMI and High Efficiency Features ! Optimized for Quasi-Resonant Converter (QRC) ! Low EMI through Variable Frequency Control and AVS Description A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequenc.

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FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation April 2009 FSQ0765RQ Green-Mode Fairchild Power Switch (FPS™) for Quasi-Resonant Operation - Low EMI and High Efficiency Features ! Optimized for Quasi-Resonant Converter (QRC) ! Low EMI through Variable Frequency Control and AVS Description A Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency. The FSQ-series is an integrated Pulse-Width Modulation (PWM) controller and SenseFET specifically designed for quasi-resonant operation and Alternating Valley Switching (AVS). The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), LeadingEdge Blanking (LEB), optimized gate driver, internal softstart, temperature-compensated precise current sources for a loop compensation, and self-protection circuitry. Compared with a discrete MOSFET and PWM controller solution, the FSQ-series can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for cost-effective designs of quasi-resonant switching flyback converters. (Alternating Valley Switching) ! High-Efficiency through Minimum Voltage Switching ! Narrow Frequency Variation Range over Wide Load and Input Voltage Variation Power Consumption ! Advanced Burst-Mode Operation for Low Standby ! Simple Scheme for Sync Voltage Detection ! Pulse-by-Pulse Current Limit ! Various Protection functions: Overload Protection ! ! ! ! (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Output Short Protection (OSP) Under-Voltage Lockout (UVLO) with Hysteresis Internal Startup Circuit Internal High-Voltage Sense FET (650V) Built-in Soft-Start (17.5ms) Applications ! Power Supply for LCD TV and Monitor, VCR, SVR, STB, and DVD & DVD Recorder ! Adapter Related Resources Visit http://www.fairchildsemi.com/apnotes/ for: ! AN-4134: Design Guidelines for Offline Forward ! ! ! ! ! ! ! Converters Using Fairchild Power Switch (FPS™) AN-4137: Design Guidelines for Offline Flyback Converters Using Fairchild Power Switch (FPS™) AN-4140: Transformer Design Consideration for Offline Flyback Converters Using Fairchild Power Switch (FPS™) AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch (FPS™) Flyback Applications AN-4145: Electromagnetic Compatibility for Power Converters AN-4147: Design Guidelines for RCD Snubber of Flyback AN-4148: Audible Noise Reduction Techniques for Fairchild Power Switch Fairchild Power Switch(FPS™) Applications AN-4150: Design Guidelines for Flyback Converters Using FSQ-Series Fairchild Power Switch (FPS™) © 2008 Fairchild Semiconductor Corporation FSQ0765RQ Rev. 1.0.1 www.fairchildsemi.com Free Datasheet http://www.datasheet4u.com/ FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation Ordering Information Maximum Output Power(1) Product Number PKG.(5) Operating Temp. Current RDS(ON) Limit Max. 230VAC±15%(2) Adapter(3) 80W 85-265VAC Adapter(3) 48W Open Frame(4) 90W Open Frame(4) 70W Replaces Devices FSCM0765R FSDM0765RB FSQ0765RQWDTU TO-220F-6L -25 to +85°C 3.5A 1.6Ω Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC or 100/115VAC with doubler. 3. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient temperature. 4. Maximum practical continuous power in an open-frame design at 50°C ambient. 5. For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Eco Status: RoHS. © 2008 Fairchild Semiconductor Corporation FSQ0765RQ Rev. 1.0.1 2 www.fairchildsemi.com Free Datasheet http://www.datasheet4u.com/ FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation Application Diagram VO AC IN Vstr PWM FB VCC Drain Sync GND FSQ0765R Rev.00 Figure 1. Typical Flyback Application Internal Block Diagram Sync 5 Vstr 6 VCC 3 Drain 1 AVS 0.35/0.55 VBurst IFB 3R R tON < tOSP after SS SoftStart OSC Vref VCC Vref Idelay VCC good 8V/12V FB 4 PWM LEB 250ns S Q R Q Gate driver VOSP LPF AOCP VSD LPF VOVP TSD S Q 2 VOCP (1.1V) GND R Q VCC good FSQ0765R Rev.00 Figure 2. Internal Block Diagram © 2008 Fairchild Semiconductor Corporation FSQ0765RQ Rev. 1.0.1 3 www.fairchildsemi.com Free Datasheet http://www.datasheet4u.com/ FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation Pin Configuration 6. Vstr 5. Sync 4. FB 3. VCC 2. GND 1. Drain FSQ0765R Rev.00 Figure 3. Pin Configuration (Top View) Pin Definitions Pin # 1 2 3 Name Drain GND VCC Description SenseFET drain. High-voltage power SenseFET drain connection. Ground. This pin is the control ground and the SenseFE.


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