FSQ0465RS

Manufacturer Part NumberFSQ0465RS
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
FSQ0465RS datasheet
 


1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
Page 1/23

Download datasheet (4Mb)Embed
Next
FSQ0465RS/RB
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), 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
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
FSQ0465RS/RB Rev. 1.0.1
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

FSQ0465RS 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 FSQ0465RS/RB Rev. 1.0.1 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

    ... 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. © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 Maximum Output Power Current R 230V DS(ON) AC Temp. ...

  • Page 3

    ... Burst CC ref I I delay < OSP after SS LPF V OSP OVP © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 V STR Drain PWM Sync GND Figure 1. Typical Flyback Application V Sync 5 6 AVS OSC PWM S Q Soft- LEB R R ...

  • 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 FSQ0465RS/RB Rev. 1.0 STR 5. Sync GND 1 ...

  • Page 5

    ... Symbol θ 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 FSQ0465RS/RB Rev. 1.0.1 = 25°C, unless otherwise specified. A Parameter T = 25°C C (7) =25° ...

  • Page 6

    ... Minimum Duty Cycle MIN V START UVLO Threshold Voltage V STOP t Internal Soft-Start Time S/S V Over-Voltage Protection OVP BURST-MODE SECTION V BURH V Burst-Mode Voltages BURL Hysteresis © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 Condition 100µ 560V 25° 25V 1MHz ...

  • Page 7

    ... Electrical Characteristics T = 25°C unless otherwise specified. A Symbol Parameter PROTECTION SECTION I Peak Current Limit of FSQ0465RS LIMIT I Peak Current Limit of FSQ0465RB LIMIT V Shutdown Feedback Voltage SD I Shutdown Delay Current DELAY t Leading-Edge Blanking Time LEB t Threshold Time OSP Output Short Threshold Feedback V (11) ...

  • Page 8

    ... Hybrid Control Burst-Mode Burst-Mode Operation Operation Strong Protections OLP, OVP ° 145 C without TSD Hysteresis © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 FSQ-Series FSQ-Series Advantages Improved efficiency by valley switching ! Quasi-Resonant Reduced EMI noise ! Operation Reduced components to detect valley point ! Valley Switching ! ...

  • Page 9

    ... Temperature [°C] Figure 6. 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 8. Initial Switching Frequency (f © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 = 25°C. A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 5. 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 7. Startup Charging Current ( ...

  • Page 10

    ... Temperature [°C] Figure 12. Shutdown Delay Current (I 1.2 1.0 0.8 0.6 0.4 0.2 0.0 - Temperature [°C] Figure 14. Burst-Mode Low Threshold Voltage (V ) vs. T burl © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 (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 11. Feedback Source Current ( 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 ) vs. T Figure 13 ...

  • Page 11

    ... Temperature [°C] Figure 18. Shutdown Feedback Voltage (V 1.2 1.0 0.8 0.6 0.4 0.2 0.0 - Temperature [°C] Figure 20. Sync High Threshold Voltage vs. T SH2 © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 (Continued) = 25°C. A 1.2 1.0 0.8 0.6 0.4 0.2 0.0 75 100 125 -25 Figure 17. 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 19 ...

  • Page 12

    ... V SD FSQ0465 Rev.00 Figure 23. Pulse-Width-Modulation (PWM) Circuit © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 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 that the 0.9mA current source flows only through the ...

  • Page 13

    ... sync internal delay Figure 26. V < 4. sync © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0 case of a heavy W and waits for B B goes below sync , the Figure 27. After Protection Circuits: The FSQ-series has several ...

  • Page 14

    ... AOCP level. If the sensing resistor voltage is greater than the AOCP level, the set signal is applied to the latch, resulting in the shutdown of the SMPS. © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0 FSQ0465 Rev.00 Figure 30. Abnormal Over-Current Protection 4.3 Output-Short Protection (OSP): If the output is shorted, steep current with extremely high di/dt can flow through the SenseFET during the LEB time ...

  • Page 15

    ... Once it passes V BURH resumes. The feedback voltage then falls and the process repeats. Burst-mode operation alternately enables and disables switching of the power SenseFET, thereby reducing switching loss in standby mode. © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0 set 0.55V ...

  • Page 16

    ... GateX2: Counting V every 2 pulses independent on other signals . gate FSQ0465 Rev. 00 © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 8. AVS (Alternating Valley Switching): Due to the quasi-resonant operation with limited frequency, the switching frequency varies depending on input voltage, I load transition, and so on. At high input voltage, the ...

  • 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. Mylar® registered trademark of DuPont Teijin Films. © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 controller and is better for smooth CC Figure 36. Recommended PCB Layout 17 www ...

  • Page 18

    ... SMD 50V Vcc 4 3 Vfb 4 GND D102 UF 4004 R107 2 18kΩ 5 ZD101 1N4745A R108 12kΩ Optional components Figure 37. Demo Circuit of FSQ0465RS 18 Output Voltage (Maximum Current) 5.0V (2.0A) 40W 13V (2.3A) pin to avoid malfunction by abrupt pul- CC L201 D201 T1 5μH MBRF10H100 EER3016 10 13V, C202 2 ...

  • Page 19

    ... Figure 38. Transformer Schematic Diagram of FSQ0465RS 3. Winding Specification Position No Pin (s→f) Top Insulation: Polyester Tape t = 0.025mm, Four Layers Insulation: Polyester Tape t = 0.025mm, Two Layers N /2 12V Insulation: Polyester Tape t = 0.025mm, Two Layers N a Insulation: Polyester Tape t = 0.025mm, Two Layers ...

  • Page 20

    ... C104 4.7nF/630V C105 33nF/50V C106 100nF/50V C107 47µF/50V C201 1000µF/25V C202 1000µF/25V C203 1000µF/10V C204 1000µF/10V © 2008 Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 Note Part C205 1W C301 1/2W 1W L201 1W L202 optional, 1/4W 1/4W D101 1/4W D102 1/4W ...

  • 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 FSQ0465RS/RB Rev. 1.0.1 Figure 39. 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 FSQ0465RS/RB Rev. 1.0 .36 B 9.96 5.18 4 ...

  • Page 23

    ... Fairchild Semiconductor Corporation FSQ0465RS/RB Rev. 1.0.1 23 www.fairchildsemi.com ...