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Q0765RQ 데이터시트 PDF




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기능 FSQ0765RQ
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Q0765RQ 데이터시트, 핀배열, 회로
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/




Q0765RQ pdf, 반도체, 판매, 대치품
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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Q0765RQ 전자부품, 판매, 대치품
Electrical Characteristics (Continued)
TA = 25°C unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
PROTECTION SECTION
ILIMIT
VSD
IDELAY
tLEB
tOSP
VOSP
tOSP_FB
TSD
Hys
Peak Current Limit
Shutdown Feedback Voltage
Shutdown Delay Current
Leading-Edge Blanking Time(11)
TJ = 25°C, di/dt = 460mA/µs
VCC = 15V
VFB = 5V
Output Short
Protection(11)
Threshold Time
Threshold Feedback
Voltage
Feedback Blanking Time
TJ = 25°C
OSP triggered when tON<tOSP ,
VFB>VOSP & lasts longer than
tOSP_FB
Thermal
Shutdown Temperature
Shutdown(11) Hysteresis
3.08 3.50 3.92
5.5 6.0 6.5
456
250
1.2 1.4
1.8 2.0
2.0 2.5 3.0
125 140 155
60
A
V
µA
ns
µs
V
µs
°C
SYNC SECTION
VSH1
VSL1
tsync
VSH2
VSL2
Sync Threshold Voltage 1
Sync Delay Time(11)(12)
Sync Threshold Voltage 2
VCLAMP Low Clamp Voltage
VOVP
tOVP
Over-Voltage Threshold Voltage
Protection
Blanking Time(11)
TOTAL DEVICE SECTION
VCC = 15V, VFB = 2V
VCC = 15V, VFB = 2V
ISYNC_MAX = 800µA
ISYNC_MIN = 50µA
VCC = 15V, VFB=2V
1.0 1.2 1.4
0.8 1.0 1.2
230
4.3 4.7 5.1
4.0 4.4 4.8
0.0 0.4 0.8
7.4 8.0 8.6
1.0 1.7 2.4
V
ns
V
V
V
µs
IOP
Operating Supply Current
(Control Part Only)
VCC = 13V, VFB=0V
1 3 5 mA
ISTART
ICH
VSTR
Start Current
Startup Charging Current
Minimum VSTR Supply Voltage
VCC = 10V
(before VCC reaches VSTART)
VCC = 0V, VSTR = minimum 50V
350
0.65
450
0.85
26
550
1.00
µA
mA
V
Notes:
11. Guaranteed by design, but not tested in production.
12. Includes gate turn-on time.
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
7
www.fairchildsemi.com
Free Datasheet http://www.datasheet4u.com/

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