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PDF Q0765RQ Data sheet ( Hoja de datos )
| Número de pieza | Q0765RQ | |
| Descripción | FSQ0765RQ | |
| Fabricantes | Fairchild Semiconductor | |
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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/
1 page  
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. TA = 25°C, unless otherwise specified.
Symbol
Parameter
Min.
Max.
Unit
Vstr
VDS
VCC
VFB
VSync
IDM
ID
EAS
PD
TJ
TA
TSTG
ESD
Vstr Pin Voltage
Drain Pin Voltage
Supply Voltage
Feedback Voltage Range
Sync Pin Voltage
Drain Current Pulsed
Continuous Drain Current(6)
Single Pulsed Avalanche Energy(7)
TC = 25°C
TC = 100°C
Total Power Dissipation(Tc=25°C)
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
Human Body Model
Electrostatic Discharge Capability
Charged Device Model
500
650
20
-0.3 13.0
-0.3 13.0
14.4
3.6
2.28
570
45
Internally limited
-25 +85
-55 +150
2
2
V
V
V
V
V
A
A
mJ
W
°C
°C
°C
kV
Notes:
6. Repetitive rating: Pulse width limited by maximum junction temperature.
7. L=81mH, starting TJ=25°C.
Thermal Impedance
TA = 25°C unless otherwise specified.
Symbol
Parameter
θJA Junction-to-Ambient Thermal Resistance(8)
θJC Junction-to-Case Thermal Resistance(9)
Notes:
8. Free standing with no heat-sink under natural convection.
9. Infinite cooling condition - refer to the SEMI G30-88.
Value
50
2.8
Unit
°C/W
°C/W
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
5
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
5 Page 
Typical Performance Characteristics (Continued)
These characteristic graphs are normalized at TA= 25°C.
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 16. Sync High Threshold Voltage 1
(VSH1) vs. TA
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 17. Sync Low Threshold Voltage 1
(VSL1) vs. TA
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 18. Shutdown Feedback Voltage (VSD) vs. TA
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 19. Over-Voltage Protection (VOV) vs. TA
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 20. Sync High Threshold Voltage 2
(VSH2) vs. TA
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0 25 50 75
Temperature [°C]
100 125
Figure 21. Sync Low Threshold Voltage 2
(VSL2) vs. TA
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
11
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet Q0765RQ.PDF ] | |
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