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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
November 2006
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for Quasi-Resonant Operation - Low EMI and High Efficiency
Features
Optimized for Quasi-Resonant Converter (QRC) Low EMI through Variable Frequency Control and Inherent Frequency Modulation 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 Pulse-by-Pulse Current Limit Various Protection Functions: Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) Under-Voltage Lockout (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage Sense FET (650V) Built-in Soft-Start (15ms)
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 with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout, Leading Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry. Compared with 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.
Applications
Power Supply for DVP Player and DVD Recorder Power supply for Set-Top Box Adapter Auxiliary Power Supply for PC, LCD TV, and PDP TV
Ordering Information
Maximum Output Power(1) Operating Current RDS(ON) Product PKG. Temp. Limit Max. Number(5) 230VAC15%(2) Adapter(3)
7W 10W 14W 17.5W
85-265VAC Adapter(3)
6W 9W 11W 13W
Open Frame(4)
10W 15W 20W 25W
Open Frame(4)
8W 13W 16W 19W
Replaces Devices
FSDL321 FSDM311 FSDL0165RN FSDM0265RN FSDM0265RNB FSDM0365RN RSDM0365RNB
FSQ311 FSQ0165RN FSQ0265RN FSQ0365RN
8-DIP -25 to +85C 8-DIP -25 to +85C 8-DIP -25 to +85C 8-DIP -25 to +85C
0.6A 0.9A 1.2A 1.5A
19 10 6 4.5
Notes: 1. The junction temperature can limit the maximum output power. 2. 230VAC or 100/115VAC with doubler. The maximum power with CCM operation. 3. Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient temperature. 4. Maximum practical continuous power in an open frame design at 50C ambient. 5. PB-free package per JEDEC J-STD-020B.
FPSTM is a trademark of Fairchild Semiconductor Corporation.
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 www.fairchildsemi.com
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Application Diagram
VO
AC IN Vstr PWM Sync FB VCC GND Drain
FSQ0365RN Rev.00
Figure 1. Typical Flyback Application
Internal Block Diagram
Sync 4
+ 0.7V/0.2V + VCC Vref Idelay IFB 3R R SoftStart PWM LEB 200ns S Q Gate driver 0.35/0.55 VBurst OSC + Vref VCC good 8V/12V
Vstr 5
VCC 2
Drain 67 8
FB 3
RQ
AOCP 6V VSD Sync Vovp 6V VCC good FSQ0365RN Rev.00 TSD 2.5s time delay S
1
Q VOCP (1.1V)
GND
RQ
Figure 2. Internal Block Diagram
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Pin Configuration
GND VCC 8-DIP FB Sync
D D D Vstr
FSQ0365RN Rev.00
Figure 3. Pin Configuration (Top View)
Pin Definitions
Pin #
1 2
Name
GND VCC
Description
Ground. This pin is the control ground and the SenseFET source. Power Supply. This pin is the positive supply input. This pin provides internal operating current for both start-up and steady-state operation. 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. Sync. This pin is internally connected to the sync-detect comparator for quasiresonant switching. In normal quasi-resonant operation, the threshold of the sync comparator is 0.7V/0.2V. Start-up. This pin is connected directly 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. SenseFET drain. High-voltage power SenseFET drain connection. SenseFET drain. High-voltage power SenseFET drain connection. SenseFET drain. High-voltage power SenseFET drain connection.
3
FB
4
Sync
5 6 7 8
Vstr Drain Drain Drain
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 3
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Absolute Maximum Ratings
The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. TA = 25C, unless otherwise specified.
Symbol
Vstr VDS VCC VFB VSync Vstr Pin Voltage Drain Pin Voltage Supply Voltage
Parameter
Min.
500 650
Max.
Unit
V V
20 -0.3 -0.3 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 9.0 9.0 12 8 4 1.5 230 140 50 10 1.5 Internally limited -25 -55
(8) (8)
V V V
Feedback Voltage Range Sync Pin Voltage
IDM
Drain Current Pulsed(6)
A
EAS
Single Pulsed Avalanche Energy(7)
mJ
PD TJ TA TSTG
Total Power Dissipation Operating Junction Temperature Operating Ambient Temperature Storage Temperature ESD Capability, HBM Model ESD Capability, Machine Model
W C C C
85 150 CLASS1 C CLASS B
Notes: 6. Repetitive rating: Pulse width limited by maximum junction temperature. 7. L=14mH, starting TJ=25C. 8. Meets JEDEC Standards JESD 22-A114 and 22-A115.
Thermal Impedance(9)
Symbol
8-DIP JA(10) JC(11) JT(12) Junction-to-Ambient Thermal Resistance Junction-to-Case Thermal Resistance Junction-to-Top Thermal Resistance 80 20 35 C/W
Parameter
Value
Unit
Notes: 9. All items are tested with the standards JESD 51-2 and 51-10 (DIP). 10. Free-standing, with no heat-sink, under natural convection. 11. Infinite cooling condition - refer to the SEMI G30-88. 12. Measured on the PKG top surface.
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Electrical Characteristics
TA = 25C unless otherwise specified.
Symbol
SENSEFET SECTION BVDSS IDSS
Parameter
Drain Source Breakdown Voltage Zero-Gate-Voltage Drain Current FSQ0365RN Drain-Source onState Resistance FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN Reverse Transfer Capacitance FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311 FSQ0365RN FSQ0265RN FSQ0165RN FSQ311
Condition
VCC = 0V, ID = 100A VDS = 560V
Min. Typ. Max. Unit
650 100 3.5 4.5 6.0 10.0 19.0 5.0 8.0 14.0 315 550 250 162 47 38 25 18 9.0 17.0 10.0 3.8 11.2 20.0 12.0 9.5 34 15 4 19 28.3 55.0 30.0 33.0 32 25 10 42 V A
RDS(ON)
TJ = 25C, ID = 0.5A
CSS
Input Capacitance
VGS = 0V, VDS = 25V, f = 1MHz
pF
COSS
Output Capacitance
VGS = 0V, VDS = 25V, f = 1MHz
pF
CRSS
VGS = 0V, VDS = 25V, f = 1MHz
pF
td(on)
Turn-On Delay Time
VDD = 350V, ID = 25mA
ns
tr
Rise Time
VDD = 350V, ID = 25mA
ns
td(off)
Turn-Off Delay Time
VDD = 350V, ID = 25mA
ns
tf
Fall Time
VDD = 350V, ID = 25mA
ns
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Electrical Characteristics (Continued)
TA = 25C unless otherwise specified.
Symbol
CONTROL SECTION tON.MAX tB tW fS fS IFB DMIN VSTART VSTOP tS/S VBURH VBURL Hysteresis PROTECTION SECTION
Parameter
Maximum ON Time Blanking Time Detection Time Window Initial Switching Frequency Switching Frequency Minimum Duty Cycle UVLO Threshold Voltage Internal Soft-Start Time Variation(13)
Condition
TJ = 25C TJ = 25C, Vsync = 0V
Min. Typ. Max. Unit
10.5 13.2 50.5 12.0 15.0 3.0 55.6 5 700 11 900 12 8 15 0.45 0.25 0.55 0.35 200 0.65 0.45 61.7 10 1100 0 13 9 7 13.5 16.8 sec sec sec kHz % A % V V ms V V mV 1.68 1.34 1.0 0.67 6.5 6 6.5 4 155 0.85 0.26 V A ns V sec C V V ns A
-25C < TJ < 85C VFB = 0V VFB = 0V After turn-on With free-running frequency TJ = 25C, tPD = 200ns(14)
Feedback Source Current
BURST-MODE SECTION Burst-Mode Voltages
FSQ0365RN ILIMIT Peak Current Limit FSQ0265RN FSQ0165RN FSQ311 VSD IDELAY tLEB VOVP tOVP TSD VSH VSL tsync IOP ISTART ICH VSTR Shutdown Feedback Voltage Shutdown Delay Current Leading-Edge Blanking Time(13) Over-Voltage Protection Over-Voltage Protection Blanking Time Thermal Shutdown Temperature(13)
TJ = 25C, di/dt = 240mA/sec TJ = 25C, di/dt = 200mA/sec TJ = 25C, di/dt = 150mA/sec TJ = 25C, di/dt = 100mA/sec VCC = 15V VFB = 5V VCC = 15V, VFB = 2V
1.32 1.06 0.8 0.53 5.5 4 5.5 2 125 0.55 0.14
1.50 1.20 0.9 0.60 6.0 5 200 6.0 3 140 0.70 0.20 300
SYNC SECTION Sync Threshold Voltage Sync Delay Time(13)(15)
TOTAL DEVICE SECTION Operating Supply Current (Control Part Only) Start Current Start-up Charging Current Minimum VSTR Supply Voltage VCC = 15V VCC = VSTART - 0.1V (before VCC reaches VSTART) VCC = 0V, VSTR = min. 40V 1 270 0.65 3 360 0.85 26 5 450 1.00 mA A mA V
Notes: 13. Though guaranteed, it is not tested in the mass production. 14. Propagation delay in the control IC. 15. Include gate turn-on time.
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Comparison Between FSDM0x65RNB and FSQ-Series
Function
Operation method EMI reduction
FSDM0x65RNB
Constant frequency PWM Frequency modulation
FSQ-Series
Quasi-resonant operation Valley switching & inherent frequency modulation
FSQ-Series Advantages
Improved efficiency by valley switching Reduced EMI noise Reduce EMI noise by two ways
Burst-mode operation Fixed burst peak
Advanced burst-mode
Improved standby power by valley switching also in burst-mode Because the current peak during burst operation is dependent on VFB, it is easier to solve audible noise Improved reliability through precise abnormal over-current protection
Protection
AOCP
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Typical Performance Characteristics
These characteristic graphs are normalized at TA= 25C.
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 4. Operating Supply Current (IOP) vs. TA
Figure 5. UVLO Start Threshold Voltage (VSTART) vs. TA
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 6. UVLO Stop Threshold Voltage (VSTOP) vs. TA
Figure 7. Start-up Charging Current (ICH) vs. TA
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 8. Initial Switching Frequency (fS) vs. TA
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Figure 9. Maximum On Time (tON.MAX) vs. TA
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Typical Performance Characteristics (Continued)
These characteristic graphs are normalized at TA= 25C.
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 10. Blanking Time (tB) vs. TA
Figure 11. Feedback Source Current (IFB) vs. TA
1.2 1.0
1.2 1.0
Normalized
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 12. Shutdown Delay Current (IDELAY) vs. TA
Figure 13. Burst-Mode High Threshold Voltage (Vburh) vs. TA
1.2 1.0
1.2 1.0
Normalized
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 14. Burst-Mode Low Threshold Voltage (Vburl) vs. TA
Figure 15. Peak Current Limit (ILIM) vs. TA
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Typical Performance Characteristics (Continued)
These characteristic graphs are normalized at TA= 25C.
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 16. Sync High Threshold Voltage (VSH) vs. TA
Figure 17. Sync Low Threshold Voltage (VSL) vs. TA
1.2 1.0
1.2 1.0
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Normalized
0.8 0.6 0.4 0.2 0.0 -25 0 25 50 75 100 125
Temperature [C]
Temperature [C]
Figure 18. Shutdown Feedback Voltage (VSD) vs. TA
Figure 19. Over-Voltage Protection (VOV) vs. TA
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Functional Description
1. Startup: At startup, an internal high-voltage current source supplies the internal bias and charges the external capacitor (Ca) connected to the VCC pin, as illustrated in Figure 20. When VCC reaches 12V, the FPS begins switching and the internal high-voltage current source is disabled. The FPS continues its normal switching operation and the power is supplied from the auxiliary transformer winding unless VCC goes below the stop voltage of 8V.
2.2 Leading Edge Blanking (LEB): At the instant the internal SenseFET is turned on, a high-current spike usually occurs through the SenseFET, caused by primary-side capacitance and secondary-side rectifier reverse recovery. Excessive voltage across the Rsense resistor would lead to incorrect feedback operation in the current mode PWM control. To counter this effect, the FPS employs a leading edge blanking (LEB) circuit. This circuit inhibits the PWM comparator for a short time (tLEB) after the SenseFET is turned on.
VCC Idelay Vref IFB
OSC
VDC
VO
FOD817A
VFB
CB
3 D1 D2 3R + VFB* R
SenseFET
Ca
KA431
Gate driver
-
VCC 2 ICH Vref 8V/12V VCC good Internal Bias 5
Vstr
VSD
FSQ0365RN Rev. 00
OLP
Rsense
Figure 21. Pulse-Width-Modulation (PWM) Circuit 3. Synchronization: The FSQ-series employs a quasiresonant switching technique to minimize the switching noise and loss. The basic waveforms of the quasiresonant converter are shown in Figure 22. To minimize the MOSFET's switching loss, the MOSFET should be turned on when the drain voltage reaches its minimum value, as shown in Figure 22. The minimum drain voltage is indirectly detected by monitoring the VCC winding voltage, as shown in Figure 22.
Vds
FSQ0365RN Rev.00
Figure 20. Start-up Circuit 2. Feedback Control: FPS employs current mode control, as shown in Figure 21. An opto-coupler (such as the FOD817A) and shunt regulator (such as the KA431) are typically used to implement the feedback network. Comparing the feedback voltage with the voltage across the Rsense resistor makes it possible to control the switching duty cycle. When the reference pin voltage of the shunt regulator exceeds the internal reference voltage of 2.5V, the opto-coupler LED current increases, thus pulling down the feedback voltage and reducing the duty cycle. This event typically happens when the input voltage is increased or the output load is decreased. 2.1 Pulse-by-Pulse Current Limit: Because current mode control is employed, the peak current through the SenseFET is limited by the inverting input of PWM comparator (VFB*), as shown in Figure 21. Assuming that the 0.9mA current source flows only through the internal resistor (3R + R = 2.8k), the cathode voltage of diode D2 is about 2.5V. Since D1 is blocked when the feedback voltage (VFB) exceeds 2.5V, the maximum voltage of the cathode of D2 is clamped at this voltage, thus clamping VFB*. Therefore, the peak value of the current through the SenseFET is limited.
VRO VRO
VDC
Vsync
tF Vovp (6V)
0.7V 0.2V 300ns Delay MOSFET Gate
ON
ON
FSQ0365RN Rev.00
Figure 22. Quasi-Resonant Switching Waveforms
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
4. Protection Circuits: The FSQ-series has several self-protective functions, such as Overload Protection (OLP), Abnormal Over-Current protection (AOCP), OverVoltage Protection (OVP), and Thermal Shutdown (TSD). All the protections are implemented as autorestart mode. Once the fault condition is detected, switching is terminated and the SenseFET remains off. This causes VCC to fall. When VCC falls down to the Under-Voltage Lockout (UVLO) stop voltage of 8V, the protection is reset and start-up circuit charges VCC capacitor. When the VCC reaches the start voltage of 12V, the FSQ-series resumes normal operation. If the fault condition is not removed, the SenseFET remains off and VCC drops to stop voltage again. In this manner, the auto-restart can alternately enable and disable the switching of the power SenseFET until the fault condition is eliminated. Because these protection circuits are fully integrated into the IC without external components, the reliability is improved without increasing cost.
Fault occurs
voltage. If the output consumes more than this maximum power, the output voltage (VO) decreases below the set voltage. This reduces the current through the optocoupler LED, which also reduces the opto-coupler transistor current, thus increasing the feedback voltage (VFB). If VFB exceeds 2.8V, D1 is blocked and the 5A current source starts to charge CB slowly up to VCC. In this condition, VFB continues increasing until it reaches 6V, when the switching operation is terminated, as shown in Figure 24. The delay time for shutdown is the time required to charge CB from 2.8V to 6V with 5A. A 20 ~ 50ms delay time is typical for most applications.
VFB
6.0V
FSQ0365RN Rev.00
Overload protection
2.8V
Power on Fault removed
VDS
t12= CFB*(6.0-2.8)/Idelay t1 t2
t
Figure 24. Overload Protection 4.2 Abnormal Over-Current Protection (AOCP): When the secondary rectifier diodes or the transformer pins are shorted, a steep current with extremely high-di/dt can flow through the SenseFET during the LEB time. Even though the FSQ-series has OLP (Overload Protection), it is not enough to protect the FSQ-series in that abnormal case, since severe current stress is imposed on the SenseFET until OLP triggers. The FSQ-series has an internal AOCP (Abnormal Over-Current Protection) circuit as shown in Figure 25. When the gate turn-on signal is applied to the power SenseFET, the AOCP block is enabled and monitors the current through the sensing resistor. The voltage across the resistor is compared with a preset AOCP level. If the sensing resistor voltage is greater than the AOCP level, the set signal is applied to the latch, resulting in the shutdown of the SMPS.
3R
VCC
12V 8V
t
FSQ0365RN Rev. 00
Normal operation
Fault situation
Normal operation
Figure 23. Auto Restart Protection Waveforms 4.1 Overload Protection (OLP): Overload is defined as the load current exceeding its normal level due to an unexpected abnormal event. In this situation, the protection circuit should trigger to protect the SMPS. However, even when the SMPS is in the normal operation, the overload protection circuit can be triggered during the load transition. To avoid this undesired operation, the overload protection circuit is designed to trigger only after a specified time to determine whether it is a transient situation or a true overload situation. Because of the pulse-by-pulse current limit capability, the maximum peak current through the Sense FET is limited, and therefore the maximum input power is restricted with a given input
OSC PWM LEB 200ns
S R Q
Q
Gate driver
R
Rsense 1 GND VOCP
AOCP FSQ0365RN Rev.00 -
Figure 25. Abnormal Over-Current Protection
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
4.3 Over-Voltage Protection (OVP): If the secondary side feedback circuit malfunctions or a solder defect causes an opening in the feedback path, the current through the opto-coupler transistor becomes almost zero. Then, VFB climbs up in a similar manner to the overload situation, forcing the preset maximum current to be supplied to the SMPS until the overload protection triggers. Because more energy than required is provided to the output, the output voltage may exceed the rated voltage before the overload protection triggers, resulting in the breakdown of the devices in the secondary side. To prevent this situation, an OVP circuit is employed. In general, the peak voltage of the sync signal is proportional to the output voltage and the FSQ-series uses a sync signal instead of directly monitoring the output voltage. If the sync signal exceeds 6V, an OVP is triggered, shutting down the SMPS. To avoid undesired triggering of OVP during normal operation, the peak voltage of the sync signal should be designed below 6V. 4.4 Thermal Shutdown (TSD): The SenseFET and the control IC are built in one package. This makes it easy for the control IC to detect the abnormal over temperature of the SenseFET. If the temperature exceeds ~150C, the thermal shutdown triggers. 5. Soft-Start: The FPS has an internal soft-start circuit that increases PWM comparator inverting input voltage with the SenseFET current slowly after it starts up. The typical soft-start time is 15ms, The pulse width to the power switching device is progressively increased to establish the correct working conditions for transformers, inductors, and capacitors. The voltage on the output capacitors is progressively increased with the intention of smoothly establishing the required output voltage. This mode helps prevent transformer saturation and reduces stress on the secondary diode during startup. 6. Burst Operation: To minimize power dissipation in standby mode, the FPS enters burst-mode operation. As the load decreases, the feedback voltage decreases. As shown in Figure 26, the device automatically enters burst-mode when the feedback voltage drops below VBURL (350mV). At this point, switching stops and the output voltages start to drop at a rate dependent on standby current load. This causes the feedback voltage to rise. Once it passes VBURH (550mV), switching resumes. The feedback voltage then falls and the process repeats. Burst-mode operation alternately enables and disables switching of the power SenseFET, thereby reducing switching loss in standby mode.
VO
VOset
VFB
0.55V 0.35V
IDS
VDS
time
FSQ0365RN Rev.00
t1
Switching disabled
t2 t3
Switching disabled
t4
Figure 26. Waveforms of Burst Operation 7. Switching Frequency Limit: To minimize switching loss and EMI (Electromagnetic Interference), the MOSFET turns on when the drain voltage reaches its minimum value in quasi-resonant operation. However, this causes switching frequency to increases at light load conditions. As the load decreases, the peak drain current diminishes and the switching frequency increases. This results in severe switching losses at light-load condition, as well as intermittent switching and audible noise. Because of these problems, the quasi-resonant converter topology has limitations in a wide range of applications.
To overcome this problem, FSQ-series employs a frequency-limit function, as shown in Figures 27 and 28. Once the SenseFET is turned on, the next turn-on is prohibited during the blanking time (tB). After the blanking time, the controller finds the valley within the detection time window (tW) and turns on the MOSFET, as shown in Figures 27 and 28 (Cases A, B, and C). If no valley is found during tW, the internal SenseFET is forced to turn on at the end of tW (Case D). Therefore, our devices have a minimum switching frequency of 55kHz and a maximum switching frequency of 67kHz, as shown in Figure 28.
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
tsmax=18s IDS IDS
When the resonant period is 2s 67kHz A B 59kHz 55kHz C
Constant frequency
A
tB=15s ts
D
Burst mode
IDS
IDS
B
tB=15s ts
FSQ0365RN Rev. 00
PO
Figure 28. Switching Frequency Range
IDS
IDS
C
tB=15s ts
IDS
IDS
tB=15s
D
tW=3s
tsmax=18s
FSQ0365RN Rev. 00
Figure 27. QRC Operation with Limited Frequency
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 14
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Application Information
Application
DVD Player Power Supply
FPS Device
Input Voltage Range
85-265VAC
Rated Output Power
Output Voltage (Max. Current)
5.1V (1.0A) 3.4V (1.0A) 12V (0.4A) 16V (0.3A)
FSQ0365RN
19W
Features
High efficiency ( >77% at universal input) Low standby mode power consumption (<1W at 230VAC input and 0.5W load) Reduce EMI noise through Quasi-Resonant Operation Enhanced system reliability through various protection functions Internal soft-start (15ms)
Key Design Notes
The delay time for overload protection is designed to be about 30ms with C107 of 47nF. If faster/slower triggering of OLP is required, C107 can be changed to a smaller/larger value (eg. 100nF for 60ms). The input voltage of Vsync must be higher than -0.3V. By proper voltage sharing by R106 & R107 resistors, the input voltage can be adjusted. The SMD-type 100nF capacitor must be placed as close as possible to VCC pin to avoid malfunction by abrupt pulsating noises and to improved surge immunity.
1. Schematic
C209 47pF T101 EER2828 RT101 5D-9 R105 100k C103 33F 400V 2 IC101 FSQ0365RN 1 BD101 Bridge Diode 3 5 4 Sync 4 C102 100nF,275VAC 3 C105 47nF 50V FB GND 1 Vstr 8 Drain 7 Drain 6 Drain Vcc 12 R102 56k C104 10nF 630V R108 62 1 11 D201 UF4003 C210 47pF C201 470F 35V L202 3 12V, 0.4A 10 D202 UF4003 C203 470F 35V C204 470F 35V L201 16V, 0.3A C202 470F 35V
2 D101 1N 4007
C106 C107 100nF 22F 2 SMD 50V
L203 R103 5 4 5 9 6 D203 SB360 C205 1000F 10V L204 3.4V, 1A D204 SB360 C207 1000F 10V C208 1000F 10V C206 1000F 10V 5.1V, 1A
D102 1N 4004 R104 12k ZD101 1N4746A
C110 33pF 50V
R106 R107 6.2k 6.2k
D103 1N4148
LF101 40mH
8 C302 3.3nF R201 510 R203 6.2k R202 1k R204 20k C209 100nF
C101 100nF 275VAC
TNR 10D471K
F101 FUSE
IC202 FOD817A IC201 KA431 R205 6k FSQ0365RN Rev:00
AC IN
Figure 29. Demo Circuit
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 15
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
2. Transformer
EER2828 Np/2 1 11 N16V 10 N12V 9N 3.4V 8
6mm
12 Np/2 N16V N12V Na N5.1V
3mm
Np/2 2 3 Na 4 5
7 6N 5.1V
N3.4V Np/2
FSQ0365RN Rev: 00
Figure 30. Transformer Schematic Diagram
3. Winding Specification No
Np/2 N3.4V N5V Na N12V N16V Np/2
Pin (sf)
32 98 69 45 10 12 11 12 21
Wire
0.25
x1
Turns
50 4 2 16 14 18 50
Winding Method
Center Solenoid Winding Center Solenoid Winding Center Solenoid Winding Center Solenoid Winding Center Solenoid Winding Center Solenoid Winding Center Solenoid Winding
Insulation: Polyester Tape t = 0.050mm, 2 Layers 0.33 x 2 0.33 x 1 0.25 x 1 0.33 x 3 0.33 x 3 0.25 x 1 Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 3 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers Insulation: Polyester Tape t = 0.050mm, 2 Layers
4. Electrical Characteristics Pin
Inductance Leakage 1-3 1-3
Specification
1.4mH 10% 25H Max.
Remarks
100kHz, 1V Short all other pins
5. Core & Bobbin
Core: EER2828 (Ae=86.66mm2) Bobbin: EER2828
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 16 www.fairchildsemi.com
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
6. Demo Board Part List Part
R102 R103 R104 R105 R106 R107 R108 R201 R202 R203 R204 R205 C101 C102 C103 C104 C105 C106 C107 C110 C201 C202 C203 C204 C205 C206 C207 C208 C209
Value
Resistor
Note
1W 1/2W 1/4W 1/4W 1/4W 1/4W 1W 1/4W 1/4W 1/4W 1/4W 1/4W
Part
L201 L202 L203 L204 D101 D102 ZD101 D103 D201 D202 D203 D204
Value
Inductor
Note
56k 5 12k 100k 6.2k 6.2k 62 510 1k 6.2k 20k 6k
Capacitor
10H 10H 4.9H 4.9H
Diode
IN4007 IN4004 1N4746A 1N4148 UF4003 UF4003 SB360 SB360
IC
100nF/275VAC 100nF/275VAC 33F/400V 10nF/630V 47nF/50V 100nF/50V 22F/50V 33pF/50V 470F/35V 470F/35V 470F/35V 470F/35V 1000F/10V 1000F/10V 1000F/10V 1000F/10V 100nF /50V
Box Capacitor Box Capacitor Electrolytic Capacitor Film Capacitor Mono Capacitor SMD (1206) Electrolytic Capacitor Ceramic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Electrolytic Capacitor Ceramic Capacitor TNR 10D471K T101
Varistor
IC101 IC201 IC202 Fuse RT101 BD101 LF101
FSQ0365RN KA431 (TL431) FOD817A
Fuse
FPSTM Voltage reference Opto-coupler
2A/250V
NTC
5D-9
Bridge Diode
2KBP06M2N257
Line Filter
Bridge Diode
40mH
Transformer
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 17
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FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
Package Dimensions
8-DIP
Dimensions are in millimeters unless otherwise noted.
#1
#8
9.20 0.20 0.362 0.008 9.60 MAX 0.378
#4
#5
2.54 0.100
7.62 0.300
5.08 MAX 0.200 3.40 0.20 0.134 0.008
3.30 0.30 0.130 0.012 0.33 0.013 MIN
0.25 -0.05
0~15
+0.10
0.010 -0.002
September 1999, Rev B 8dip_dim.pdf
+0.004
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 18
0.018 0.004
www.fairchildsemi.com
1.524 0.10 0.060 0.004
0.46 0.10
6.40 0.20 0.252 0.008
(
0.79 ) 0.031
FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Green Mode Fairchild Power Switch (FPSTM) for QRC
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DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only.
Rev. I20
Preliminary
No Identification Needed
Full Production
Obsolete
Not In Production
(c) 2006 Fairchild Semiconductor Corporation FSQ0365RN, FSQ0265RN, FSQ0165RN, FSQ311 Rev. 1.0.0 19
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