fsq0465rb

Manufacturer Part Numberfsq0465rb
DescriptionFsq0465rs/rb- Green-mode Fairchild Power Switch Fps? For Quasi-resonant Operation - Low Emi And High Efficiency
ManufacturerFairchild Semiconductor
fsq0465rb datasheet
 


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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 Start-up 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. 1.0.0
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 2008
Modulation
(PWM)
controller
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