FSQ0465RU FAIRCHILD | Alldatasheet

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Technical content

Features

! Optimized for Quasi-Resonant Converters (QRC) ! 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: 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 Converters ! AN-4148: Audible Noise Reduction Techniques for Fairchild Power Switch (FPS ™) Applications ! AN-4150: Design Guidelines for Flyback Converters Using FSQ-Series Fairchild Power Switch (FPS™)

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), Leading- Edge Blanking (LEB), optimized gate driver, internal soft- start, 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.

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 2

Ordering Information

For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Notes: 1. The junction temperature can limit the maximum output power. 2. 230V AC 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. Eco Status, RoHS. Product Number PKG.(5) Operating Temp. Current Limit RDS(ON) Max. Maximum Output Power(1) Replaces Devices 230VAC±15%(2) 85-265VAC Adapter(3) Open Frame(4) Adapter(3) Open Frame(4) FSQ0465RUWDTU TO- 220F-6L -25 to +85°C 1.8A 4.0 Ω 50W 60W 28W 40W FSCM0465R FSDM0465RE

Figure 3. Pin Configuration (Top View) 1D r a i n SenseFET Drain. High-voltage power SenseFET drain connection. 2G N D Ground. This pin is the control ground and the SenseFET source. both start-up and steady-state operation. tection triggers, which shuts down the FPS. ing. In normal quasi-resonant operation, the threshold of the sync comparator is 1.2V/1.0V. disabled. It is not recommended to connect Vstr and Drain together.

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 5 Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi- tion, 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. Notes: 6. Repetitive peak switching current when inductor load is assumed : limited by maximum duty and maximum junction temperature. 7. L=45mH, I AS=2.1A, starting TJ=25°C. Thermal Impedance TA = 25°C unless otherwise specified. Notes: 8. Free standing with no heat -sink under natural convection. 9. Infinite cooling condition - refer to the SEMI G30-88. Symbol Parameter Min. Max. Unit Vstr Vstr Pin Voltage 500 V VDS Drain Pin Voltage 650 V VCC Supply Voltage 21 V VFB Feedback Voltage Range -0.3 13.0 V VSync Sync Pin Voltage -0.3 13.0 V IDM Drain Current Pulsed 8.4 A IDSW Continuous Drain Switching Current(6) TC = 25°C 3.8 A EAS Single Pulsed Avalanche Energy(7) 100 mJ PD Total Power Dissipation (TC=25°C) 45 W TJ Operating Junction Temperature Internally limited °C TA Operating Ambient Temperature -25 +85 °C TSTG Storage Temperature -55 +150 °C ESD Electrostatic Discharge Human Body Model, JESD22-A114 2.0 kV Charged Device Model, JESD22-C101 2.0 kV Symbol Parameter Package Value Unit θJA Junction-to-Ambient Thermal Resistance(8) TO-220F-6L 50 °C/W θJC Junction-to-Case Thermal Resistance(9) 2.8 °C/W IDS DMAX fSW

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 6

Electrical Characteristics

TA = 25°C unless otherwise specified. Continued on the following page... Symbol Parameter Condition Min. Typ. Max. Unit SenseFET Section BVDSS Drain Source Breakdown Voltage V CC=0V, ID=250µA 650 V IDSS1 Zero-Gate-Voltage Drain Current 1 V DS=650V, VGS=0V, TC=25oC2 5 0 µ A IDSS2 Zero-Gate-Voltage Drain Current 2 V DS=520V, VGS=0V, TC=125oC2 5 0 µ A RDS(ON) Drain-Source On-State Resistance T J=25°C, ID=0.5A 3.5 4.0 Ω COSS Output Capacitance V GS=0V, VDS=25V, f=1MHz 45 pF td(on) Turn-On Delay Time V DD=325V, ID=3.5A 12 ns tr Rise Time V DD=325V, ID=3.5A 22 ns td(off) Turn-Off Delay Time V DD=325V, ID=3.5A 20 ns tf Fall Time V DD=325V, ID=3.5A 19 ns Control Section tON.MAX Maximum On Time T J=25°C 8.8 10.0 11.2 µs tB Blanking Time T J=25°C, Vsync=5V 13.5 15.0 16.5 µs tW Detection Time Window T J=25°C, Vsync=0V 6.0 µs fS Initial Switching Frequency 59.6 66.7 75.8 kHz ΔfS Switching Frequency Variation(11) -25°C < TJ < 85°C ±5 ±10 % tAVS AVS Triggering Threshold(11) On Time at VIN=240VDC, Lm=360μH (AVS Triggered when VAVS > Spec. and tAVS < Spec.) 4.0 µs VAVS Feedback Voltage 1.2 V tSW Switching Time Variance by AVS(11) Sync=500kHz Sine Input VFB=1.2V, tON=4.0µs 13.5 20.5 µs IFB Feedback Source Current V FB=0V 700 900 1100 µA DMIN Minimum Duty Cycle V FB=0V 0 % VSTART UVLO Threshold Voltage 11 12 13 V VSTOP After Turn-On 7.5 8.0 8.5 V tS/S Internal Soft-Start Time With Free-Running Frequency 17.5 ms VOVP Over-Voltage Protection 18 19 20 V Burst-ModeSection VBURH Burst-Mode Voltages T J=25°C, tPD=200ns(10) 0.45 0.55 0.65 V VBURL 0.25 0.35 0.45 V Hysteresis 200 mV

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 7 Electrical Characteristics (Continued) TA = 25°C unless otherwise specified. Notes: 10. Propagation delay in the control IC. 11. Guaranteed by design; not tested in production. 12. Includes gate turn-on time. Symbol Parameter Condition Min. Typ. Max. Unit Protection Section ILIMIT Peak Current Limit T J=25°C, di/dt=480mA/µs 1.6 1.8 2.0 A VSD Shutdown Feedback Voltage V CC=15V 5.5 6.0 6.5 V IDELAY Shutdown Delay Current V FB=5V 4 5 6 µA tLEB Leading-Edge Blanking Time(11) 250 ns tOSP Output Short Protection(11) Threshold Time TJ= 25°C OSP Triggered When tON < tOSP, VFB > VOSP and Lasts Longer than tOSP_FB 1.2 1.4 µs VOSP Threshold Feedback Voltage 1.8 2.0 V tOSP_FB Feedback Blanking Time 2.0 2.5 3.0 µs TSD Thermal Shutdown(11) Shutdown Temperature +125 +140 +155 Hys Hysteresis +60 Sync Section VSH1 Sync Threshold Voltage 1 V CC = 15V, VFB=2V 1.0 1.2 1.4 V VSL1 0.8 1.0 1.2 tsync Sync Delay Time(11)(12) 230 ns VSH2 Sync Threshold Voltage 2 V CC = 15V, VFB=2V 4.3 4.7 5.1 V VSL2 4.0 4.4 4.8 VCLAMP Low Clamp Voltage ISYNC_MAX=800µA, ISYNC_MIN=50µA 0.0 0.4 0.8 V Total Device Section IOP Operating Supply Current V CC=13V 1 3 5 mA ISTART Start Current VCC=10V (Before VCC Reaches VSTART) 350 450 550 µA ICH Startup Charging Current V CC=0V, VSTR=Minimum 50V 0.65 0.85 1.00 mA VSTR Minimum VSTR Supply Voltage 26 V

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 8 Comparison Between FSDM0x65RNB and FSQ-Series Function FSDM0x65RE FSQ-Series FSQ-Series Advantages Operation Method Constant Frequency PWM Quasi-Resonant Operation ! Improved efficiency by valley switching ! Reduced EMI noise ! Reduced components to detect valley point EMI Reduction Frequency Modulation Reduced EMI Noise ! Valley switching ! Inherent frequency modulation ! Alternate valley switching Hybrid Control CCM or AVS Based on Load and Input Condition ! Improves efficiency by introducing hybrid control Burst-Mode Operation Burst-Mode Operation Advanced Burst-Mode Operation ! Improved standby power by advanced burst-mode Strong Protections OLP, OVP OLP, OVP, AOCP, OSP ! Improved reliability through precise AOCP ! Improved reliability through precise OSP TSD 145°C without Hysteresis 140°C with 60°C Hysteresis ! Stable and reliable TSD operation ! Converter temperature range

  1. Startup: At startup, an internal high-voltage current

Figure 22. Startup Circuit

  1. Feedback Control : FPS employs current-mode

are typically used to impl ement the feedback network. increased or the output load is decreased. Figure 23. Pulse-Width-Modulation (PWM) Circuit

2.1 Pulse-by-Pulse Current Limit : Because current-

through the SenseFET is limited.

2.2 Leading-Edge Blanking (LEB) : At the instant the

  1. Synchronization: The FSQ-series employs a quasi-

winding voltage, as shown in Figure 24. Figure 24. Quasi-Resonant Switching Waveforms

6 VSTR

4 OSC

4.1 Overload Protection (OLP): Overload is defined as

protection circuit should trigger to protect the SMPS. 20 ~ 50ms delay time is typical for most applications. Figure 29. Overload Protection

4.2 Abnormal Over-Current Protection (AOCP): When

Figure 30. Abnormal Over-Current Protection

4.3 Output-Short Protection (OSP) : If the output is

abnormal condition output short is shown in Figure 31. Figure 31. Output Short Waveforms

4.4 Over-Voltage Protection (OVP) : If the secondary

CC should be designed below 19V.

4.5 Thermal Shutdown with Hysteresis (TSD) : The

SenseFET and the control IC are built in one package. CC reaches startup voltage (Vstart).

  1. Soft-Start: The FPS has an internal soft-start circuit

stress on the secondary diode during startup.

  1. Burst Operation : To minimize power dissipation in

thereby reducing switching loss in standby mode. Figure 32. Waveforms of Burst Operation

  1. Switching Frequency Limit : To minimize switching

topology in a wide range of applications. Figure 34. Once the SenseFET is turned on, the next SenseFET is forced to turn on at the end of tW (Case D).

noise inevitable in power-handling components. the same trace and meet only at one point, the GND pin. currents by decreasing resistance. connect to the signal ground (not power ground). traces should not draw across or close to the drain line. using jumper wires for power ground and drain. Mylar® is a registered trademark of DuPont Teijin Films. Figure 36. Recommended PCB Layout

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 18 Typical Application Circuit ! Average efficiency of 25%, 50%, 75%, and 100% load conditions is higher than 80% at universal input ! Low standby mode power consumption (<1W at 230VAC input and 0.5W load) ! Reduce EMI noise through valley switching operation ! Enhanced system reliability through various protection functions ! Internal soft-start (17.5ms) Key Design Notes ! The delay time for overload protection is designed to be about 23ms with C105 of 33nF. If faster/slower triggering of OLP is required, C105 can be changed to a smaller/larger value (e.g. 100nF for 70ms). ! The input voltage of VSync must be between 4.7V and 8V just after MOSFET turn-off to guarantee hybrid control and to avoid OVP triggering during normal operation. ! The SMD-type 100nF capacitor must be placed as close as possible to VCC pin to avoid malfunction by abrupt pul- sating noises and to improve surge immunity. 1. Schematic Figure 37. Demo Circuit of FSQ0465RU

5 R105

Figure 38. Transformer Schematic Diagram of FSQ0465RU

  1. Electrical Characteristics

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 20 6. Demo Board Part List Part Value Note Part Value Note Resistor C301 4.7nF/1kV Ceramic Capacitor R101 1M Ω 1W Inductor R102 75k Ω 1/2W L201 5µH 5A Rating R103 51k Ω 1W L202 5µH 5A Rating R105 100 Ω optional, 1/4W Diode R107 39k Ω 1/4W D101 IN4007 1A, 1000V General-Purpose Rectifier R108 33k Ω 1/4W D102 UF4004 1A, 400V Ultrafast Rectifier R201 1k Ω 1/4W ZD101 1N4745A 1W 16V Zener Diode (optional) R202 1.2k Ω 1/4W D201 MBRF10H100 10A,100V Schottky Rectifier R203 18k Ω 1/4W D202 MBRF1060 10A,60V Schottky Rectifier R204 8k Ω 1/4W IC R205 8k Ω 1/4W IC101 FSQ0465RU FPS™ Capacitor IC201 KA431 (TL431) Voltage Reference C101 150nF/275V AC Box Capacitor IC202 FOD817A Opto-Coupler C102 150nF/275V AC Box Capacitor Fuse C103 100µF/400V Electrolytic Capacitor Fuse 2A/250V C104 3.3nF/630V Film Capacitor NTC C105 33nF/50V Ceramic Capacitor RT101 5D-11 C106 100nF/50V SMD (1206) Bridge Diode C107 47µF/50V Electrolytic Capacitor BD101 2KBP06M Bridge Diode C201 1000µF/25V Low-ESR Electrolytic Capacitor Line Filter C202 1000µF/25V Low-ESR Electrolytic Capacitor LF101 20mH C203 2200µF/10V Low-ESR Electrolytic Capacitor Transformer C204 1000µF/10V Low-ESR Electrolytic Capacitor T1 EER3019 Ae=137mm C205 47nF/50V Ceramic Capacitor

Figure 39. 6-Lead, TO-220 Package specifically the warranty therein, which covers Fairchild products. http://www.fairchildsemi.com/packaging/.

FSQ0465RU — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0465RU Rev. 1.0.0 22