FSQ0565R, FSQ0765R
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 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 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 Resourses
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
FSQ0565R, FSQ0765R Rev. 1.0.1
www.fairchildsemi.com
FSQ0565R, FSQ0765R — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
June 2008
Maximum Output Power(1)
Product
Number
PKG.(5)
Operating Current RDS(ON)
Max.
Temp.
Limit
230VAC±15%(2)
85-265VAC
Adapter(3)
Open
Frame(4)
Adapter(3)
Open
Frame(4)
Replaces
Devices
FSQ0565R TO-220F-6L -40 to +85°C
3.0A
2.2Ω
70W
80W
41W
60W
FSCM0565R
FSDM0565RB
FSQ0765R TO-220F-6L -40 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. These parts are RoHS compliant.
© 2008 Fairchild Semiconductor Corporation
FSQ0565R, FSQ0765R Rev. 1.0.1
www.fairchildsemi.com
2
FSQ0565R, FSQ0765R — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Ordering Information
VO
AC
IN
Vstr
Drain
PWM
Sync
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
S Q
R
SoftStart
LEB
250ns
Gate
driver
R Q
tON < tOSP
after SS
VOSP
LPF
AOCP
2
VSD
S
TSD
Q
VOCP
(1.1V)
GND
R Q
LPF
VOVP
VCC good
FSQ0765R Rev.00
Figure 2. Internal Block Diagram
© 2008 Fairchild Semiconductor Corporation
FSQ0565R, FSQ0765R Rev. 1.0.1
www.fairchildsemi.com
3
FSQ0565R, FSQ0765R — Green-Mode Farichild Power Switch (FPS™) for Quasi-Resonant Operation
Application Diagram
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 start-up 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
Start-up. 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
FSQ0565R, FSQ0765R Rev. 1.0.1
www.fairchildsemi.com
4
FSQ0565R, FSQ0765R — 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.
Vstr
Vstr Pin Voltage
500
650
VDS
Drain Pin Voltage
VCC
Supply Voltage
VFB
Feedback Voltage Range
Sync Pin Voltage
VSync
IDM
Drain Current Pulsed
Continuous Drain
PD
Total Power
V
-0.3
13
V
-0.3
13
V
FSQ0565R
11
A
FSQ0765R
14.4
A
Current(6)
Single Pulsed Avalanche
Energy(7)
V
V
FSQ0765R
EAS
Unit
20
FSQ0565R
ID
Max.
TC = 25°C
2.8
TC = 100°C
1.7
TC = 25°C
3.6
TC = 100°C
2.28
A
A
FSQ0565R
190
mJ
FSQ0765R
570
mJ
Dissipation(Tc=25oC)
45
W
Internally
limited
°C
TJ
Operating Junction Temperature
-40
TA
Operating Ambient Temperature
-40
+85
°C
Storage Temperature
-55
+150
°C
TSTG
ESD
Electrostatic Discharge Capability, Human Body Model
2.0
kV
Electrostatic Discharge Capability, Charged Device Model
2.0
kV
Notes:
6. Repetitive rating: Pulse width limited by maximum junction temperature.
7. L=14mH, starting TJ=25°C.
Thermal Impedance
TA = 25°C unless otherwise specified.
Symbol
θJA
θJC
Parameter
Package
Junction-to-Ambient Thermal Resistance
Junction-to-Case Thermal Resistance
(8)
TO-220F-6L
(9)
Value
Unit
50
°
2.8
°
C/W
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
FSQ0565R, FSQ0765R Rev. 1.0.1
www.fairchildsemi.com
5
FSQ0565R, FSQ0765R — 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 = 560V
RDS(ON)
Drain-Source On-State
Resistance
COSS
Output Capacitance
td(on)
Turn-On Delay Time
tr
td(off)
tf
TJ = 25°C, ID = 0.5A
1.76
2.20
FSQ0765R
TJ = 25°C, ID = 0.5A
1.3
1.6
FSQ0565R
FSQ0565R
FSQ0765R
FSQ0565R
FSQ0765R
FSQ0565R
Turn-Off Delay Time
FSQ0765R
FSQ0565R
Fall Time
V
300
FSQ0565R
FSQ0765R
Rise Time
650
FSQ0765R
78
VGS = 0V, VDS = 25V, f = 1MHz
22
ns
22
52
VDD = 350V, ID = 25mA
ns
70
95
VDD = 350V, ID = 25mA
ns
105
50
VDD = 350V, ID = 25mA
Ω
pF
125
VDD = 350V, ID = 25mA
µA
ns
65
CONTROL SECTION
tON.MAX
Maximum On Time
TJ = 25°C
8.8
10.0
11.2
µs
13.5
15.0
16.5
µs
tB
Blanking Time
TJ = 25°C, Vsync = 5V
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