FSQ0565RS

Manufacturer Part NumberFSQ0565RS
DescriptionA Quasi-Resonant Converter (QRC) generally shows lower EMI and higher power conversion efficiency than a conventional hard-switched converter with a fixed switching frequency
ManufacturerFairchild Semiconductor
FSQ0565RS datasheet
 


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FSQ0565RS/RQ
Green-Mode Fairchild Power Switch (FPS™) for
Quasi-Resonant Operation -
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), 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
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
AN-4150: Design Guidelines for Flyback Converters
!
Using FSQ-Series Fairchild Power Switch (FPS
© 2008 Fairchild Semiconductor Corporation
FSQ0565RS/RQ Rev. 1.0.3
Low EMI and High Efficiency
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
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.
)
)
) Flyback Applications
Applications
)
December 2009
Modulation
(PWM)
controller
www.fairchildsemi.com
and

FSQ0565RS Summary of contents

  • Page 1

    ... Fairchild Power Switch (FPS AN-4150: Design Guidelines for Flyback Converters ! Using FSQ-Series Fairchild Power Switch (FPS © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 Low EMI and High Efficiency 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 ...

  • Page 2

    ... STR Drain PWM Sync GND Figure 1. Typical Flyback Application 2 (1) (2) ±15% 85-265V Replaces AC Devices Open Open (3) Adapter (4) (4) Frame Frame FSCM0565R 80W 41W 60W FSDM0565RE FSCM0565R 80W 41W 60W FSDM0565RE V O FSQ0565RS Rev. 00 www.fairchildsemi.com ...

  • Page 3

    ... FSQ0565RS/RQ Rev. 1.0.3 V Sync 5 AVS OSC PWM S Q Soft- LEB Start 250ns S Q TSD R Q LPF V good CC Figure 2. Internal Block Diagram of FSQ0565RS Sync 5 AVS OSC PWM S Q Soft- LEB Start 250ns S Q TSD R Q LPF V good CC Figure 3. Internal Block Diagram of FSQ0565RQ ...

  • Page 4

    ... 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 exter str nal capacitor connected to the V disabled not recommended to connect V © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0 STR 5. Sync GND 1 ...

  • Page 5

    ... Junction-to-Ambient Thermal Resistance JA θ Junction-to-Case Thermal Resistance JC Notes: 8. Free standing with no heat-sink under natural convection. 9. Infinite cooling condition - refer to the SEMI G30-88. © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 = 25°C, unless otherwise specified. A Parameter T = 25° 100°C ...

  • Page 6

    ... STOP t Internal Soft-Start Time S/S V Over-Voltage Protection (FSQ0565RS) OVP V OVP Over-Voltage Protection (FSQ0565RQ) t OVP BURST-MODE SECTION V BURH V Burst-Mode Voltages BURL Hysteresis © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 Condition 100µ 560V 25° 25V 1MHz ...

  • Page 7

    ... CH V Minimum V Supply Voltage STR STR Notes: 10. Propagation delay in the control IC. 11. Guaranteed by design; not tested in production. 12. Includes gate turn-on time. © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 (Continued) Condition FSQ0565RS T = 25°C, di/dt = 370mA/µs J FSQ0565RQ T = 25°C, di/dt = 370mA/µ 15V ...

  • Page 8

    ... Frequency PWM Frequency EMI Reduction Modulation Hybrid Control Burst-Mode Burst-Mode Operation Operation Strong Protections OLP, OVP 145°C without TSD Hysteresis Differences Between FSQ0565RS and FSQ0565RQ Function FSQ0565RS I 2.25A LIM V OVP CC Over Voltage (triggered by V Protection voltage) © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev ...

  • Page 9

    ... Temperature [°C] Figure 7. UVLO Stop Threshold Voltage (V ) vs. T STOP 1.2 1.0 0.8 0.6 0.4 0.2 0.0 - Temperature [°C] Figure 9. Initial Switching Frequency (f © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 = 25°C. A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 6. UVLO Start Threshold Voltage OP A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 Figure 8. Startup Charging Current ( ...

  • Page 10

    ... Temperature [°C] Figure 13. Shutdown Delay Current (I 1.2 1.0 0.8 0.6 0.4 0.2 0.0 - Temperature [°C] Figure 15. Burst-Mode Low Threshold Voltage (V ) vs. T burl © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 (Continued) = 25°C. A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 12. Feedback Source Current ( 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 14 ...

  • Page 11

    ... Temperature [°C] Figure 19. Shutdown Feedback Voltage (V 1.2 1.0 0.8 0.6 0.4 0.2 0.0 - Temperature [°C] Figure 21. Sync High Threshold Voltage vs. T SH2 © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 (Continued) = 25°C. A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 Figure 18. Sync Low Threshold Voltage 1 A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 20 ...

  • Page 12

    ... KA431 - V SD FSQ0565 Rev.00 Figure 24. Pulse-Width-Modulation (PWM) Circuit © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 2.1 Pulse-by-Pulse Current Limit: Because current- mode control is employed, the peak current through the SenseFET is limited by the inverting input of PWM comparator (V pin that the 0.9mA current source flows only through the ...

  • Page 13

    ... sync internal delay Figure 27. V < 4. sync © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0 case of a heavy W and waits for goes below sync , the Figure 28. After Protection Circuits: The FSQ-series has several ...

  • Page 14

    ... Figure 32. Output Short Waveforms 4.4.1 V FSQ0565RS: If the secondary-side feedback circuit malfunctions or a solder defect causes an opening in the feedback path, the current through the opto-coupler transistor becomes almost zero. In this case similar manner to the overload situation, forcing the preset maximum current to be supplied to the SMPS until overload protection is activated ...

  • Page 15

    ... This enables the control IC to detect the abnormally high temperature of the SenseFET. If the temperature © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 exceeds approximately 140°C, the thermal shutdown triggers IC shutdown. The IC resumes operation when the junction temperature decreases 60°C from TSD temperature and V 5 ...

  • Page 16

    ... Figure 35. QRC Operation with Limited Frequency © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 To overcome these problems, FSQ-series employs a frequency-limit function, as shown in Figures 35 and 36. Once the SenseFET is turned on, the next turn-on is prohibited during the blanking time (t blanking time, the controller finds the valley within the detection time window (t shown in Figures 35 and Figure 36 (Cases A, B, and C) ...

  • Page 17

    ... When the heat sink is connected to the ground, it should be connected to the power ground. If possible, avoid using jumper wires for power ground and drain. © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 V continued 2 pulses V continued another 2 pulses ...

  • Page 18

    ... SMD 50V Vcc 4 3 Vfb 4 GND D102 UF 4004 R107 2 39kΩ 5 ZD101 1N4745A R108 27kΩ Optional components Figure 39. Demo Circuit of FSQ0565RS 18 Output Voltage (Maximum Current) 5.0V (2.0A) 50W 14V (2.8A) pin to avoid malfunction CC L201 D201 T1 5μH MBRF10H100 EER3016 10 14V, C202 2.8A C201 1000μ ...

  • Page 19

    ... EER3016 FSQ0565RS Rev.0 Figure 40. Transformer Schematic Diagram of FSQ0565RS 3. Winding Specification Position No Pin (s→f) Top Insulation: Polyester Tape t = 0.025mm, 4 Layers Insulation: Polyester Tape t = 0.025mm, 2 Layers N a Insulation: Polyester Tape t = 0.025mm, 2 Layers N 5V Insulation: Polyester Tape t = 0.025mm, 2 Layers ...

  • Page 20

    ... C106 100nF/50V C107 47µF/50V Electrolytic (Samyoung) C201 1000µF/25V C202 1000µF/25V C203 2200µF/10V C204 1000µF/10V © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 Note Part C205 1W C301 1/2W 1W L201 jumper L202 optional, 1/4W 1/4W, 1% D101 1/4W, 1% D102 ...

  • Page 21

    ... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 Figure 41. 6-Lead, TO-220 Package (Forming) 21 www.fairchildsemi.com ...

  • Page 22

    ... Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 B 5.18 4.98 (21.01) ...

  • Page 23

    ... PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary No Identification Needed Obsolete © 2008 Fairchild Semiconductor Corporation © 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 ® * Power-SPM FlashWriter ® PowerTrench FPS PowerXS™ F-PFS ® ...