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FSQ0765RQ
Green-Mode Fairchild Power Switch (FPS™) for
Quasi-Resonant Operation - Low EMI and High Efficiency
Features
Description
! Optimized for Quasi-Resonant Converter (QRC)
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 that is well suited
for cost-effective designs of quasi-resonant switching
flyback converters.
! 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™)
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
www.fairchildsemi.com
FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
April 2009
Maximum Output Power(1)
Product
Number
PKG.(5)
Operating
Temp.
FSQ0765RQWDTU TO-220F-6L -25 to +85°C
Current RDS(ON)
Limit
Max.
3.5A
1.6Ω
230VAC±15%(2)
85-265VAC
Adapter(3)
Open
Frame(4)
Adapter(3)
Open
Frame(4)
80W
90W
48W
70W
Replaces
Devices
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
www.fairchildsemi.com
2
FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Ordering Information
FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Application Diagram
VO
AC
IN
Vstr
PWM
Sync
Drain
GND
VCC
FB
FSQ0765R Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync
5
AVS
VCC
Idelay
FB
4
VCC
Drain
6
3
1
OSC
Vref
0.35/0.55
VBurst
Vref
Vstr
VCC good
8V/12V
IFB
PWM
3R
R
SoftStart
S Q
LEB
250ns
Gate
driver
R Q
tON < tOSP
after SS
VOSP
LPF
AOCP
VSD
S
TSD
Q
2
VOCP
(1.1V)
GND
R Q
LPF
VOVP
VCC good
FSQ0765R Rev.00
Figure 2. Internal Block Diagram
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
www.fairchildsemi.com
3
6. Vstr
5. Sync
4. FB
3. VCC
2. GND
1. Drain
FSQ0765R Rev.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
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.
4
FB
Feedback. This pin is internally connected to the inverting input of the PWM comparator. The
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.
Vstr
Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link. At
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.
6
Description
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
www.fairchildsemi.com
4
FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Pin Configuration
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, 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
Vstr Pin Voltage
500
V
VDS
Drain Pin Voltage
650
V
VCC
Supply Voltage
VFB
Feedback Voltage Range
-0.3
Sync Pin Voltage
-0.3
VSync
IDM
ID
Drain Current Pulsed
Continuous Drain Current(6)
20
V
13.0
V
13.0
V
14.4
A
TC = 25°C
3.6
TC = 100°C
2.28
A
EAS
Single Pulsed Avalanche Energy(7)
570
mJ
PD
Total Power Dissipation(Tc=25°C)
45
W
TJ
Operating Junction Temperature
Internally limited
°C
TA
Operating Ambient Temperature
-25
+85
°C
+150
°C
TSTG
ESD
Storage Temperature
-55
Electrostatic Discharge Capability
Human Body Model
2
Charged Device Model
2
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
Resistance(8)
θJC
Junction-to-Ambient Thermal
Junction-to-Case Thermal
Resistance(9)
Value
Unit
50
°C/W
2.8
°C/W
Notes:
8. Free standing with no heat-sink under natural convection.
9. Infinite cooling condition - refer to the SEMI G30-88.
© 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
www.fairchildsemi.com
5
FSQ0765RQ — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Absolute Maximum Ratings
TA = 25°C unless otherwise specified.
Symbol
Parameter
Condition
Min. Typ. Max. Unit
SENSEFET SECTION
BVDSS
Drain Source Breakdown Voltage
VCC = 0V, ID = 100µA
IDSS
Zero-Gate-Voltage Drain Current
VDS = 520V, VGS = 0V
Drain-Source On-State Resistance
TJ = 25°C, ID = 1.8A
1.3
COSS
Output Capacitance
VGS = 0V, VDS = 25V, f = 1MHz
125
td(on)
Turn-On Delay Time
27
ns
Rise Time
102
ns
63
ns
65
ns
RDS(ON)
tr
td(off)
tf
650
VDD = 325V, ID = 6.5A
Turn-Off Delay Time
Fall Time
V
300
µA
1.6
Ω
pF
CONTROL SECTION
tON.MAX
Maximum On Time
TJ = 25°C
8.8
10.0
11.2
µs
tB
Blanking Time
TJ = 25°C, Vsync = 5V
13.5
15.0
16.5
µs
tW
Detection Time Window
TJ = 25°C, Vsync = 0V
fS
Initial Switching Frequency
ΔfS
tAVS
Switching Frequency Variation(11)
On Time
6.0
59.6
66.7
75.8
kHz
-25°C < TJ < 85°C
±5
±10
%
at VIN = 240VDC, Lm = 360μH
(AVS triggered when VAVS>spec
& tAVS
