FSQ0765RS AN-4134 AN-4137 AN-4140 AN-4141 AN-4145 AN-4147 AN-4148 AN-4150 - Datasheet Archive

 

Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation - Low EMI and High Efficiency Features Description !

 

FSQ0765RS FSQ0765RS Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation - Low EMI and High Efficiency Features Description ! Optimized for Quasi-Resonant Converter (QRC) 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 for cost-effective designs of quasi-resonant switching flyback converters. ! Low EMI through Variable Frequency Control and AVS (Alternating Valley Switching) ! High Efficiency through Minimum Voltage Switching ! Narrow Frequency Variation Range over Wide Load and Input Voltage Variation ! Advanced Burst-Mode Operation for Low Standby Power Consumption ! 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 AN-4134: Design Guidelines for Off-line Forward ! ! ! ! ! ! ! Converters Using Fairchild Power Switch (FPSTM) AN-4137 AN-4137: Design Guidelines for Off-line Flyback Converters Using Fairchild Power Switch (FPSTM) AN-4140 AN-4140: Transformer Design Consideration for off-line Flyback Converters using Fairchild Power Switch (FPSTM) AN-4141 AN-4141: Troubleshooting and Design Tips for Fairchild Power Switch (FPSTM) Flyback Applications AN-4145 AN-4145: Electromagnetic Compatibility for Power Converters AN-4147 AN-4147: Design Guidelines for RCD Snubber of Flyback Converters AN-4148 AN-4148: Audible Noise Reduction Techniques for FPS Applications AN-4150 AN-4150: Design Guidelines for Flyback Converters Using FSQ-series Fairchild Power Switch (FPSTM) © 2008 Fairchild Semiconductor Corporation FSQ0765RS FSQ0765RS · Rev. 1.0.1 www.fairchildsemi.com FSQ0765RS FSQ0765RS - Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation April 2009 Maximum Output Power(1) Product Number PKG.(5) Operating Temp. FSQ0765RSWDTU FSQ0765RSWDTU TO-220F-6L -25 to +85°C 230VAC 230VAC±15%(2) Current RDS(ON) Limit Max. 2.5A Adapter(3) 1.6 80W 85-265VAC 85-265VAC Open Open Adapter(3) Frame(4) Frame(4) 90W 48W 70W Replaces Devices FSCM0765R FSCM0765R FSDM07652RE FSDM07652RE Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC 230VAC or 100/115VAC 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: . ECO status: RoHS. © 2008 Fairchild Semiconductor Corporation FSQ0765RS FSQ0765RS · Rev. 1.0.1 www.fairchildsemi.com 2 FSQ0765RS FSQ0765RS - Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation Ordering Information FSQ0765RS FSQ0765RS - Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation Application Diagram VO AC IN Vstr PWM Sync Drain GND VCC FB FSQ0765R FSQ0765R Rev.00 Figure 1. Typical Flyback Application Internal Block Diagram Vstr AVS VCC Drain 6 Sync 5 3 1 OSC VCC VCC Vref Idelay FB 4 Vref 0.35/0.55 VBurst VCC good 8V/12V IFB PWM 3R R SoftStart S Q LEB 250ns Gate driver R Q tON < tOSP after SS VOSP LPF AOCP VSD VCC S TSD Q 2 VOCP (1.1V) GND R Q LPF VOVP VCC good FSQ0765RS FSQ0765RS Rev.00 Figure 2. Internal Block Diagram © 2008 Fairchild Semiconductor Corporation FSQ0765RS FSQ0765RS · Rev. 1.0.1 www.fairchildsemi.com 3 6. Vstr 5. Sync 4. FB 3. VCC 2. GND 1. Drain FSQ0765R FSQ0765R Rev.00 Figure 3. Pin Configuration (Top View) Pin Definitions Pin # Name 1 Drain SenseFET drain. High-voltage power SenseFET drain connection. 2 GND Ground. This pin is the control ground and the SenseFET source. 3 VCC Power Supply. This pin is the positive supply input, providing internal operating current for both startup and steady-state operation. 4 FB Feedback. This pin is internally connected to the inverting input of the PWM comparator. The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should be placed between this pin and GND. If the voltage of this pin reaches 6V, the overload protection triggers, which shuts down the FPS. 5 Sync Sync. This pin is internally connected to the sync-detect comparator for quasi-resonant switching. In normal quasi-resonant operation, the threshold of the sync comparator is 1.2V/1.0V. Vstr Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At startup, the internal high-voltage current source supplies internal bias and charges the external capacitor connected to the VCC pin. Once VCC reaches 12V, the internal current source is disabled. It is not recommended to connect Vstr and Drain together. 6 Description © 2008 Fairchild Semiconductor Corporation FSQ0765RS FSQ0765RS · Rev. 1.0.1 www.fairchildsemi.com 4 FSQ0765RS FSQ0765RS - Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation Pin Configuration Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. TA = 25°C, unless otherwise specified. Symbol Parameter Min. Max. Unit Vstr Vstr Pin Voltage 500 V VDS Drain Pin Voltage 650 V VCC Supply Voltage VFB Feedback Voltage Range -0.3 Sync Pin Voltage -0.3 VSync IDM ID 20 V 13.0 V 13.0 V 14.4 Drain Current Pulsed A TC = 25°C 3.60 TC = 100°C Continuous Drain Current(6) 2.28 A EAS Single Pulsed Avalanche Energy(7) 570 mJ PD Total Power Dissipation (TC=25°C) 45 W TJ Operating Junction Temperature Internally limited °C TA Operating Ambient Temperature -25 +85 °C -55 +150 °C TSTG ESD Storage Temperature Human Body Model, JESD22-A114 JESD22-A114 2.0 kV Charged Device Model, JESD22-C101 JESD22-C101 Electrostatic Discharge Protection 2.0 kV Notes: 6. Repetitive rating: Pulse-width limited by maximum junction temperature. 7. L=81mH, starting TJ=25°C. Thermal Impedance TA = 25°C unless otherwise specified. Symbol Parameter Package Resistance(8) JA Junction-to-Ambient Thermal JC Junction-to-Case Thermal Resistance(9) TO-220F-6L Value Unit 50 °C/W 2.8 °C/W Notes: 8. Free standing with no heat-sink under natural convection. 9. Infinite cooling condition - refer to the SEMI G30-88 G30-88. © 2008 Fairchild Semiconductor Corporation FSQ0765RS FSQ0765RS · Rev. 1.0.1 www.fairchildsemi.com 5 FSQ0765RS FSQ0765RS - Green-Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation Absolute Maximum Ratings TA = 25°C unless otherwise specified. Symbol Parameter Conditions Min. Typ. Max. Units 650 SENSEFET SECTION BVDSS Drain Source Breakdown Voltage VCC = 0V, ID = 100µA IDSS Zero-Gate-Voltage Drain Current VDS = 520V, VGS = 0V Drain-Source On-State Resistance TJ = 25°C, ID = 1.8A 1.3 COSS Output Capacitance VGS = 0V, VDS = 25V, f = 1MHz 125 td(on) Turn-On Delay Time 27 ns Rise Time 102 ns 63 ns 65 ns RDS(ON) tr td(off) tf VDD = 325V, ID = 6.5A Turn-Off Delay Time V 300 Fall Time µA 1.6 pF CONTROL SECTION tON.MAX Maximum On Time TJ = 25°C 8.8 10.0 11.2 µs tB Blanking Time TJ = 25°C, Vsync = 5V 13.2 15.0 16.8 µs tW Detection Time Window TJ = 25°C, Vsync = 0V fSW Initial Switching Frequency fSW tAVS Switching Frequency Variation(11) On Time 6.0 59.6 66.7 75.8 kHz -25°C < TJ < 85°C ±5 ±10 % at VIN = 240VDC 240VDC, Lm = 360H (AVS triggered when VAVS>spec & tAVS