Document
FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
December 2009
FSQ0565RS/RQ Green-Mode Fairchild Power Switch (FPS™) for Quasi-Resonant Operation - Low EMI and High Efficiency
Features
! Optimized for Quasi-Resonant Converters (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 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), 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: 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 www.DataSheet4U.com ! 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™)
! AN-4134: Design Guidelines for Offline Forward
© 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3
www.fairchildsemi.com
FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Ordering Information
Maximum Output Power(1) Product Number
FSQ0565RSWDTU FSQ0565RQWDTU
PKG.(5)
Operating Temp.
Current RDS(ON) Limit Max.
2.25A 3.0A
230VAC±15%(2) Adapter(3)
70W
85-265VAC Adapter(3)
41W
Open Frame(4)
80W
Open Frame(4)
60W
Replaces Devices
TO-220F6L
-25 to +85°C
2.2Ω
FSCM0565R FSDM0565RE
TO-220F6L -25 to +85°C FSQ0565RQLDTU (L-Forming)
FSQ0565RSLDTU
2.25A 3.0A 2.2Ω 70W 80W 41W 60W
FSCM0565R FSDM0565RE
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. 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. Eco Status, RoHS
Application Diagram
VO
AC IN VSTR
Drain
PWM
Sync VFB VCC GND
FSQ0565RS Rev. 00
Figure 1. Typical Flyback Application
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© 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 2
www.fairchildsemi.com
FSQ0565RS/RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Block Diagrams
Sync 5 Vstr 6 VCC 3 Drain 1
AVS
0.35/0.55 VBurst IFB 3R R tON < tOSP after SS SoftStart PWM
OSC
Vref VCC good 8V/12V
VCC
Vref Idelay
FB 4
S Q LEB 250ns R Q Gate driver
VOSP
LPF AOCP
VSD VCC VOVP LPF
TSD
S
Q
2
VOCP (1.1V)
GND
R Q
VCC good FSQ0565RS Rev.00
Figure 2. Internal Block Diagram of FSQ0565RS
Sync 5
Vstr 6
VCC 3
Drain 1
AVS
0.35/0.55 VBurst IFB 3R R tON < tOSP after SS SoftStart PWM
OSC
Vref VCC good 8V/12V
VCC
Vref Idelay
FB 4
S Q LEB 250ns R Q Gate driver
VOSP
LPF AOCP
VSD
TSD LPF
S
Q
2
VOCP (1.1V)
GND
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R Q
VOVP VCC good FSQ0565RQ Rev.00
Figure 3. Internal Block Diagram of FSQ0565RQ
© 2008 Fairchild Semiconductor Corporation FSQ0565RS/RQ Rev. 1.0.3 3
www.fairchildsemi.com
FSQ0565RS/RQ — Green-Mode Farichil.