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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
October 2007
FSFR-Series / FSFR2100
Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Features
Variable Frequency Control with 50% Duty Cycle for Half-bridge Resonant Converter Topology High Efficiency through Zero Voltage Switching (ZVS) Internal Super-FETs with Fast-Recovery Type Body Diode (trr=120ns) Fixed Dead Time (350ns) Optimized for MOSFETs Up to 300kHz Operating Frequency Pulse Skipping for Frequency Limit (Programmable) at Light-Load Condition Remote On/Off Control Using Control Pin Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)
Description
FSFR-series is a highly integrated power switch family specially designed for high-efficiency half-bridge resonant converters. Offering everything necessary to build a reliable and robust resonant converter, the FSFRseries simplifies designs and improves productivity, while improving performance. The FSFR-series combines power MOSFETs with fast-recovery type body diodes, a high-side gate-drive circuit, an accurate current controlled oscillator, frequency limit circuit, soft-start, and built-in protection functions. The high-side drive circuit has a common-mode noise cancellation capability, which guarantees stable operation with excellent noise immunity. The fast-recovery body diode of the MOSFETs improves reliability against abnormal operation conditions, while minimizing the effect of the reverse recovery. Using the zero-voltage-switching (ZVS) technique dramatically reduces the switching losses and the efficiency is significantly improved. The ZVS also reduces the switching noise noticeably, which allows a small-sized EMI filter. The FSFR-series can be applied to various resonant converter topologies such as series resonant, parallel resonant, and LLC resonant converters.
Applications
PDP TV and LCD TV Desktop PC and Server Adapter Telecom Power Audio Power
Related Resources
AN4151 -- Half-bridge LLC Resonant Converter Design TM using FSFR-series Fairchild Power Switch (FPS )
Ordering Information
Part Number
FSFR2100 FSFR2000 FSFR1900 FSFR1800
(3) (3) (3)
Package
9-SIP 9-SIP 9-SIP 9-SIP
Operating RDS(ON_MAX) Temperature
-40 to +85C -40 to +85C -40 to +85C -40 to +85 C 0.38 0.67 0.85 0.95
Maximum Output Power without Heatsink (1,2) (VIN=350~400V)
200W 160W 140W 120W
Maximum Output Power with Heatsink (1,2) (VIN=350~400V)
450W 350W 300W 260W
Notes: 1. The junction temperature can limit the maximum output power. 2. Maximum practical continuous power in an open-frame design at 50C ambient. 3. Preliminary part design. Contact a Fairchild representative for availability.
All packages are lead free per JEDEC: J-STD-020B standard.
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0 www.fairchildsemi.com
FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Application Circuit Diagram
D1 Llk VCC
RT LVcc VDL HVcc
Cr Np Ns
Vo
Lm Ns
CDL VIN
CON
Control IC
D2
VCTR KA431
CF RF
CS SG PG
Rsense
Figure 1. Typical Application Circuit (LLC Resonant Half-bridge Converter)
Block Diagram
1.5 s
Figure 2. Internal Block Diagram
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0 www.fairchildsemi.com 2
FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Pin Assignments
1 VDL
2
34 5 6 7 8
9 HVcc
RT SG LVcc CON CS PG
10 VCTR
Figure 3. Package Diagram
Pin Definitions
Pin # 1 Name VDL Description This pin is the drain of the high-side MOSFET. It is typically connected to the input DC link voltage. This pin is for enable/disable and protection. When the voltage of this pin is above 0.6V, the IC operation is enabled. When the voltage of this pin drops below 0.4V, gate drive signals for both MOSFETs are disabled. When the voltage of this pin increases above 5V, protection is triggered. This pin programs the switching frequency. Typically, an opto-coupler is connected to control the switching frequency for the output voltage regulation. This pin senses the current flowing through the low-side MOSFET. Typically, negative voltage is applied on this pin. This pin is the control ground. This pin is the power ground. This pin is connected to the source of the low-side MOSFET. This pin is the supply voltage of the control IC. No connection. This pin is the supply voltage of the high-side drive circuit IC. This pin is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin.
2
CON
3 4 5 6 7 8 9 10
RT CS SG PG LVcc NC HVcc VCTR
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Absolute Maximum Ratings
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=25C unless otherwise specified.
Symbol
VDS LVcc HVcc VCON VCS VRT dVCTR/dt PD TJ TA TSTG VDGR VGS IDM ID
Parameter
Maximum Drain-to-source Voltage (VDL-VCTR and VCTR-PG) Low-side Supply Voltage High-side Floating Supply Voltage Control Pin Input Voltage Current Sense (CS) Pin Input Voltage RT Pin Input Voltage Allowable Low-side MOSFET Drain Voltage Slew Rate Total Power Dissipation
(4)
Min.
600 -0.3 -0.3 -0.3 -0.3 -5.0 -0.3
Max.
25.0 25.0 625.0 L-VCC 1.0 5.0 50 12 +150
Unit
V V V V V V V V/ns W C C C V
HVcc to VCTR High-side VCC Pin to Low-side Drain Voltage
Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range Drain Gate Voltage (RGS=1M) Gate Source (GND) Voltage Drain Current Pulsed Continuous Drain Current TC=25 TC=100 -40 -55 600
+85 +150
MOSFET Section 30 33 11 7 V A A
Note: 4. Per MOSFET when both MOSFETs are conducting.
Thermal Impedance
TA=25C unless otherwise specified.
Symbol
JC
Parameter
Junction-to-Case Center Thermal Impedance (Both MOSFETs Conducting)
Value
10.44
Unit
C/W
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Electrical Characteristics
TA=25C unless otherwise specified.
Symbol
MOSFET Section BVDSS RDS(ON) Trr
Parameter
Test Conditions
Specifications
Min. Typ. Max.
Unit
Drain-to-Source Breakdown Voltage On-State Resistance Body Diode Reverse Recovery Time
(5)
ID=200A, TA=25C ID=200A, TA=125C VGS=10, ID=5.5A
600 650 0.32 120 0.38
V V ns
Supply Section ILK IQHVCC IQLVCC IOHVCC IOLVCC Offset Supply Leakage Current Quiescent H-Vcc Supply Current Quiescent L-Vcc Supply Current Operating H-Vcc Supply Current (RMS Value) Operating L-Vcc Supply Current (RMS Value) H-Vcc=VC=600V (H-VCCUV+) - 0.1V (L-VCCUV+) - 0.1V FOSC=100KHz, VCON > 0.6V No switching, VCON < 0.4V FOSC=100KHz, VCON > 0.6V No switching, VCON < 0.4V 50 100 6 100 7 2 50 120 200 9 200 11 4 A A A mA A mA mA
UVLO Section LVCCUV+ LVCCUVLVCCUVH HVCCUV+ HVCCUVHVCCUVH L-Vcc Supply Under-voltage Positive Going Threshold (L-Vcc start) L-Vcc Supply Under-voltage Negative Going Threshold (L-Vcc stop) L-Vcc Supply Under-voltage Hysteresis H-Vcc Supply Under-voltage Positive Going Threshold (H-Vcc start) H-Vcc Supply Under-voltage Negative Going Threshold (H-Vcc stop) H-Vcc Supply Under-voltage Hysteresis 8.2 7.8 13.0 10.2 14.5 11.3 3.2 9.2 8.7 0.5 10.2 9.6 16.0 12.4 V V V V V V
Oscillator & Feedback Section VCONDIS VCONEN VRT FOSC DC FSS TSS2 Control Pin Disable Threshold Voltage Control Pin Enable Threshold Voltage V-I Converter Threshold Voltage Output Oscillation Frequency Output Duty Cycle Internal Soft-Start Initial Frequency Internal Soft-Start Time FSS=FOSC+40kHz, RT=5.2K 2 RT=5.2K 0.36 0.54 1.5 94 48 0.40 0.60 2.0 100 50 140 3 4 0.44 0.66 2.5 106 52 V V V KHz % KHz ms
Note: 5. This parameter, although guaranteed, is not tested. Continued on the following page...
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Electrical Characteristics (Continued)
TA=25C unless otherwise specified. Specifications Symbol Protection Section IOLP VOLP VOVP VAOCP TBAO VOCP TBO TDA TSD ISU VPRSET OLP Delay Current OLP Protection Voltage L-Vcc Over-Voltage Protection AOCP Threshold Voltage AOCP Blanking Time
(6)
Parameter
Test Conditions Min Typ Max
Unit
VCON=4V VCON > 3.5V L-Vcc > 21V V/t=-1V/s VCS < VOCP; V/t=-1V/us (V/(t=-1V/s; VFB=L_Vcc VCS < VOCP; V/t=-1V/s; VFB=L_VCC V/t=-1V/s
3.6 4.5 21 -1.0
4.8 5.0 23 -0.9 50
6.0 5.5 25 -0.8
A V V V ns
OCP Threshold Voltage OCP Blanking Time
(6)
-0.64 1.0
-0.58 1.5 250
-0.52 2.0 400 150 150
V s ns C A V
Delay Time (Low Side) Detecting from VAOCP (6) to Switch Off Thermal Shutdown Temperature
(6)
110 L-Vcc=7.5V 5
130 100
Protection Latch Sustain L-Vcc Supply Current Protection Latch Reset L-Vcc Supply Voltage
(7)
Dead-Time Control Section DT Dead Time 350 ns
Notes: 6. These parameters, although guaranteed, are not tested in production. 7. These parameters, although guaranteed, are tested only in EDS (wafer test) process.
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Typical Performance Characteristics
These characteristic graphs are normalized at TA=25C.
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
1
1
0.95
0.95
0.9 -50 -25 0 25 50
O
0.9
75
100
-50
-25
0
25
50
75
100
Temp ( C)
Temp
(OC)
Figure 4. Low-side MOSFET Duty Cycle vs. Temp.
1.1
Figure 5. Switching Frequency vs. Temp.
1.1
1.05
1.05
Normalized at 25OC
1
Normalized at 25OC
-50 -25 0 25 50 75 100
1
0.95
0.95
0.9
0.9 -50 -25 0 25 50 75 100
Temp (OC)
Temp (OC)
Figure 6. High-side VCC (H-Vcc) Start vs. Temp.
1.1
Figure 7. High-side VCC (H-Vcc) Stop vs. Temp.
1.1
1.05
1.05
Normalized at 25OC
1
Normalized at 25OC
-50 -25 0 25 50 75 100
1
0.95
0.95
0.9
0.9 -50 -25 0 25 50 75 100
Temp (OC)
Temp (OC)
Figure 8. Low-side VCC (L-Vcc) Start vs. Temp.
Figure 9. Low-side VCC (L-Vcc) Stop vs. Temp.
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Typical Performance Characteristics (Continued)
These characteristic graphs are normalized at TA=25C.
1.1
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
1
1
0.95
0.95
0.9 -50 -25 0 25 50 75 100
0.9 -50 -25 0 25 50 75 100
Temp (OC)
Temp (OC)
Figure 10. OLP Delay Current vs. Temp.
1.1
Figure 11. OLP Protection Voltage vs. Temp.
1.1
1.05
1.05
Normalized at 25OC
Normalized at 25OC
1
1
0.95
0.95
0.9 -50 -25 0 25 50 75 100
0.9 -50 -25 0 25 50 75 100
Temp (OC)
Temp
(OC)
Figure 12. L-Vcc OVP Voltage vs. Temp.
1.1
Figure 13. V-I Converter Voltage vs. Temp.
1.1
1.05
1.05
Normalized at 25OC
1
Normalized at 25OC
1
0.95
0.95
0.9 -50 -25 0 25 50 75 100
0.9 -50 -25 0 25 50 75 100
Temp (OC)
Temp (OC)
Figure 14. CON Pin Enable Voltage vs. Temp.
Figure 15. Current Limit vs. Temp.
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Functional Description
1. Basic Operation: FSFR-series is designed to drive high-side and low-side MOSFETs complementarily with 50% duty cycle. A fixed dead time of 350ns is introduced between consecutive transitions, as shown in Figure 16.
Dead time
Gain
1.8
f min
1.6
f normal
f max
f ISS
High side MOSFET gate drive
1.4
1.2
Low side MOSFET gate drve
time
1.0
Soft-start
0.8
Figure 16. MOSFETs Gate Drive Signal
0.6
60 70 80 90 100 110
freq (kHz)
120
130
140
150
2. Internal Oscillator: FSFR-series employs a currentcontrolled oscillator, as shown in Figure 17. Internally, the voltage of RT pin is regulated at 2V and the charging/discharging current for the oscillator capacitor, CT, is obtained by copying the current flowing out of RT pin (ICTC) using a current mirror. Therefore, the switching frequency increases as ICTC increases.
Figure 18. Resonant Converter Typical Gain Curve
LVcc VDL
RT Rmax Rmin Rss
Css CON
Control IC
SG
PG
Figure 19. Frequency Control Circuit
The minimum switching frequency is determined as:
f min =
Figure 17. Current Controlled Oscillator
5.2k x 100(kHz ) Rmin
(1)
3. Frequency Setting: Figure 18 shows the typical voltage gain curve of a resonant converter, where the gain is inversely proportional to the switching frequency. The output voltage can be regulated by modulating the switching frequency. Figure 19 shows the typical circuit configuration for RT pin, where the opto-coupler transistor is connected to the RT pin to modulate the switching frequency.
Assuming the saturation voltage of opto-coupler transistor is 0.2V, the maximum switching frequency is determined as:
f max = (
5.2k 4.68k + ) x 100(kHz ) Rmin Rmax
(2)
To prevent excessive inrush current and overshoot of output voltage during start-up, increase the voltage gain of the resonant converter progressively. Since the voltage gain of the resonant converter is inversely proportional to the switching frequency, the soft-start is implemented by sweeping down the switching frequency ISS from an initial high frequency (f ) until the output voltage is established. The soft-start circuit is made by connecting R-C series network on the RT pin, as shown in Figure 19. FSFR-series also has an internal soft-start for 3ms to reduce the current overshoot during the initial
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(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
cycles, which adds 40kHz to the initial frequency of the external soft-start circuit, as shown in Figure 20. Thus, the initial frequency of the soft-start is given as:
f ISS = (
5.2k 5.2k ) x 100 + 40 (kHz ) (3) + Rmin RSS
It is typical to set the initial frequency of soft-start 2~3 times the resonant frequency (fO) of the resonant network. The soft-start time is determined by the RC time constant as:
TSS = RSS CSS
fs f ISS
40kHz
(4) Figure 22. Control Pin Configuration for Pulse Skipping
Control loop take over
Remote On / Off: When an auxiliary power supply is used for standby, the main power stage using FSFRseries can be shut down by pulling down the control pin voltage, as shown in Figure 23. R1 and C1 are used to ensure soft-start when switching resumes.
time
Figure 20. Frequency Sweeping of Soft-start
R1
OP1
Main Output
4. Control Pin: The FSFR-series has a control pin that can be used for protection, cycle skipping, and remote on/off. Figure 21 shows the internal block diagram for control pin.
LVcc Idelay
C1
FPS Main Off
CON
Rmin
+
2 0.6V/0.4V
+
Aux Output
5V
OLP LVcc OVP
-
S R
Q -Q
+
-
Auto-restart protection LVcc good
Stop switching
OP1
Figure 23. Remote On / Off Circuit Figure 21. Internal Block of Control Pin Protection: When the control pin voltage exceeds 5V, protection is triggered. Detailed applications are described in the protection section. Pulse Skipping: FSFR-series stops switching when the control pin voltage drops below 0.4V and resumes switching when the control pin voltage rises above 0.6V. To use pulse-skipping, the control pin should be connected to the opto-coupler collector pin. The frequency that causes pulse skipping is given as:
SKIP
5. Protection Circuits: The FSFR-series has several self-protective functions, such as Overload Protection (OLP), Over-Current Protection (OCP), Abnormal OverCurrent Protection (AOCP), Over-Voltage Protection (OVP), and Thermal Shutdown (TSD). OLP, OCP, and OVP are auto-restart mode protections, while AOCP and TSD are latch-mode protections, as shown in Figure 24. Auto-restart Mode Protection: Once a fault condition is detected, switching is terminated and the MOSFETs remain off. When LVcc falls to the LVcc stop voltage of 11V, the protection is reset. The FPS resumes normal operation when LVcc reaches the start voltage of 14V.
=
5.2 k 4.16 k + R min R max
x100 (kHz)
(5)
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Latch-Mode Protection: Once this protection is triggered, switching is terminated and the MOSFETs remain off. The latch is reset only when LVcc is discharged below 5V.
LVcc
7
+
LVcc good
Vref
11 / 14 V
-
Internal Bias
Current Sensing Using Resonant Capacitor Voltage: For high-power applications, current sensing using a resistor may not be available due to the severe power dissipation in the resistor. In that case, indirect current sensing using the resonant capacitor voltage can be a good alternative because the amplitude of the resonant p-p capacitor voltage (Vcr ) is proportional to the resonant p-p current in the primary side (Ip ) as:
VCr p - p =
Shutdown OCP OLP OVP LVcc good CON 20k Auto-restart protection
S R Q -Q
I p p- p 2 f sCr
(6)
Latch protection
Q -Q S R
AOCP
To minimize power dissipation, a capacitive voltage divider is generally used for capacitor voltage sensing, as shown in Figure 27.
F/F
F/F
TSD LVcc < 5V
Figure 24. Protection Blocks
Np CON Control IC
Current Sensing Using Resistor: FSFR-series senses drain current as a negative voltage, as shown in Figure 25 and Figure 26. Half-wave sensing allows low power dissipation in the sensing resistor while full-wave sensing has less switching noise in the sensing signal.
Cr
Cd Rd
Ip
SG PG 100 VSENSE CB
Ns
Ns
Cr
Np
Ns
CSENSE
Ip
Ns Control IC VCS
CS SG PG
Ids
VCr VCrp-p
Rsense
Ids
VCS
Vsense
Vsense pk CB = VCr p - p Csense + CB
Vsense pk = VCON 2
Vsensepk
Figure 25. Half-wave Sensing
Ids
VCON Vsensepk
Tdelay = Rd Cd
VCS
Figure 27. Current Sensing Using Resonant Capacitor Voltage 5.1 Over-Current Protection (OCP): When the sensing pin voltage drops below -0.6V, OCP is triggered and MOSFETs remain off. This protection has a shutdown time delay of 1.5s to prevent premature shutdown during start-up. 5.2 Abnormal Over-Current Protection (AOCP): If the secondary rectifier diodes are shorted, large current with extremely high di/dt can flow through the MOSFET before OCP or OLP is triggered. AOCP is triggered without shutdown delay when the sensing pin voltage drops below -0.9V. This protection is latch mode and reset when LVcc is pulled down below 5V.
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Cr VCS
CS
Control IC Np Ns
SG
PG
Rsense
Ns
Ids
Figure 26. Full-wave Sensing
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
5.3 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 power supply. However, even when the power supply is in the normal condition, the overload situation can occur during the load transition. To avoid premature triggering of protection, the overload protection circuit should be designed to trigger only after a specified time to determine whether it is a transient situation or a true overload situation. Figure 27 shows a typical overload protection circuit. By sensing the resonant capacitor voltage on the control pin, the overload protection can be implemented. Using RC time constant, shutdown delay can be also introduced. The voltage obtained on the control pin is given as:
5.4 Over-Voltage Protection (OVP): When the LVcc reaches 23V, OVP is triggered. This protection is used when auxiliary winding of the transformer to supply VCC to FPS is utilized.
5.5 Thermal Shutdown (TSD): The MOSFETs and the control IC in one package makes it easy for the control IC to detect the abnormal over-temperature of the MOSFETs. If the temperature exceeds approximately 130C, the thermal shutdown triggers.
VCON =
CB VCr p - p 2(CB + Csense )
p-p
(7)
where VCr voltage.
is the amplitude of the resonant capacitor
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Typical Application Circuit (Half-bridge LLC Resonant Converter)
Application
LCD TV
FPSTM Device
FSFR2100
Input Voltage Range
400V (20ms hold-up time)
Rated Output Power
192W
Output Voltage (Rated Current)
24V-8A
Features
High efficiency ( >94% at 400VDC input) Reduced EMI noise through zero-voltage-switching (ZVS) Enhanced system reliability with various protection functions
C102 18nF/ 630V
D211 FYP2010DN
C202 2200F 35V
VCC
JP1 10
R106 27
D101 UF4007
Np
Ns
C201 2200F 35V
Vo
VIN=400VDC
R104 7.2k C108 12nF
C105 22F/ 50V
LVcc RT
VDL HVcc
R105 7.5k
C107 10F
Ns
C106 150nF R201 10k R202 1k D212 FYP2010DN U3 KA431 R204 62k R206 2k C204 12nF
CON
R107 2.5k
Control IC
VCTR
C101 220F/ 450V
CS
C102 100pF
C203 47nF
R203 33k
R102 1k
SG
PG
R205 7k
R101 0.2
Figure 28. Typical Application Circuit
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Typical Application Circuit (Continued)
Usually, LLC resonant converter requires large leakage inductance value. To obtain a large leakage inductance, sectional winding method is used.
Core: EER3542 (Ae=107 mm ) Bobbin: EER3542 (Horizontal)
2
2.5mm 15mm 8mm
Np
Ns2 Ns1
Pin(S F) Np Ns1 Ns2 81 12 9 16 13
Wire 0.12x30 (Litz wire) 0.1x100 (Litz wire) 0.1x100 (Litz wire) Pin 45 5 5 Specification 630H 5% 145H 5%.
Turns
Winding Method Section winding Section winding Section winding Remark
Primary-side Inductance (LP) Primary-side Effective Leakage (LR)
1 8 1 8
100kHz, 1V Short one of the secondary windings
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
Physical Dimensions
Figure 29. 9-SIP Package
(c) 2007 Fairchild Semiconductor Corporation FSFR2100 * 1.0.0
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FSFR-Series -- Fairchild Power Switch (FPSTM) for Half-Bridge Resonant Converter
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