Q0765RQ Datasheet PDF - Fairchild Semiconductor

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Q0765RQ
Fairchild Semiconductor

Part Number Q0765RQ
Description FSQ0765RQ
Page 19 Pages


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April 2009
FSQ0765RQ
Green-Mode Fairchild Power Switch (FPS™) for
Quasi-Resonant Operation - Low EMI and High Efficiency
Features
! Optimized for Quasi-Resonant Converter (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
! AN-4148: Audible Noise Reduction Techniques for
Fairchild Power Switch 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 that is well suited
for cost-effective designs of quasi-resonant switching
flyback converters.
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/



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Ordering Information
Product
Number
PKG.(5)
Operating
Temp.
Current
Limit
Maximum Output Power(1)
RDS(ON)
Max.
230VAC±15%(2)
Adapter(3)
Open
Frame(4)
85-265VAC
Adapter(3)
Open
Frame(4)
Replaces
Devices
FSQ0765RQWDTU TO-220F-6L -25 to +85°C 3.5A
1.6Ω
80W
90W
48W
70W
FSCM0765R
FSDM0765RB
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. For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html. Eco Status: RoHS.
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
2
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/



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Application Diagram
AC
IN
Sync
PWM
FB VCC
Vstr Drain
GND
VO
FSQ0765R Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync
5
AVS
FB
4
0.35/0.55
VCC
Vref
VBurst
Idelay
IFB
3R
tON < tOSP
after SS
R
Soft-
Start
PWM
Vstr VCC Drain
6 31
OSC
Vref
VCC good
8V/12V
LEB
250ns
SQ
RQ
Gate
driver
VOSP
VSD
VOVP
LPF
TSD
LPF
SQ
RQ
AOCP
VOCP
(1.1V)
2
GND
VCC good
Figure 2. Internal Block Diagram
FSQ0765R Rev.00
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
3
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/



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Pin Configuration
FSQ0765R Rev.00
6. Vstr
5. Sync
4. FB
3. VCC
2. GND
1. Drain
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin # Name
Description
1 Drain SenseFET drain. High-voltage power SenseFET drain connection.
2 GND Ground. This pin is the control ground and the SenseFET source.
3
VCC
Power Supply. This pin is the positive supply input. This pin provides internal operating current for
both startup and steady-state operation.
Feedback. This pin is internally connected to the inverting input of the PWM comparator. The
4
FB
collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor should be
placed between this pin and GND. If the voltage of this pin reaches 6V, the overload protection
triggers, which shuts down the FPS.
5
Sync
Sync. This pin is internally connected to the sync-detect comparator for quasi-resonant switching.
In normal quasi-resonant operation, the threshold of the sync comparator is 1.2V/1.0V.
Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At
6
Vstr
start-up, the internal high-voltage current source supplies internal bias and charges the external
capacitor connected to the VCC pin. Once VCC reaches 12V, the internal current source is disabled.
It is not recommended to connect Vstr and Drain together.
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
4
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/



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