FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters Features Description The FSFR-series are a highly integrated power switches designed for high-efficiency half-bridge resonant converters. Offering everything necessary to build a reliable and robust resonant converter, the FSFR-series 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 gate-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 efficiency is significantly improved. The ZVS also reduces the switching noise noticeably, which allows a small-sized Electromagnetic Interference (EMI) filter. Variable Frequency Control with 50% Duty Cycle for Half-bridge Resonant Converter Topology High Efficiency through Zero Voltage Switching (ZVS) Internal SuperFET™s with Fast-Recovery Type Body Diode (trr=120ns) for FSFR2100 and UniFETs with Fast-Recovery Type Body Diode (trr<160ns) for FSFR2000/1900/1800/1700. 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), Over-Load Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) The FSFR-series can be applied to various resonant converter topologies such as series resonant, parallel resonant, and LLC resonant converters. Applications PDP and LCD TVs Desktop PCs and servers Adapters Telecom Power Supplies Audio Power Supplies Related Resources AN4151 — Half-bridge LLC Resonant Converter Design TM using FSFR-series Fairchild Power Switch (FPS ) Ordering Information Part Number Package Operating Junction Temperature RDS(ON_MAX) Maximum Output Power Maximum Output without Heatsink Power with Heatsink (1,2) (1,2) (VIN=350~400V) (VIN=350~400V) FSFR2100 0.38Ω 200W 450W FSFR2000 0.67Ω 160W 350W 0.85Ω 140W 300W FSFR1800 0.95Ω 120W 260W FSFR1700 1.25Ω 100W 200W FSFR1900 9-SIP -40 to +130°C Notes: 1. The junction temperature can limit the maximum output power. 2. Maximum practical continuous power in an open-frame design at 50°C ambient. All standard Fairchild Semiconductor products are RoHS compliant and many are also “GREEN” or going green. For Fairchild’s definition of “green” please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter May 2008 D1 Cr Llk LVcc VCC Np HVCC Lm Ns RT CON CDL VIN Vo Ns VDL Control IC D2 VCTR KA431 CS SG PG Rsense Figure 1. Typical Application Circuit (LLC Resonant Half-bridge Converter) Block Diagram CF RF FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Application Circuit Diagram 1.5 μ s Figure 2. Internal Block Diagram © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 2 1 VDL 2 3 4 5 6 7 8 RT SG LVcc CON CS PG 9 10 VCTR HVcc Figure 3. Package Diagram Pin Definitions Pin # Name Description 1 VDL This is the drain of the high-side MOSFET, typically connected to the input DC link voltage. 2 CON 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. 3 RT This pin programs the switching frequency. Typically, an opto-coupler is connected to control the switching frequency for the output voltage regulation. 4 CS This pin senses the current flowing through the low-side MOSFET. Typically, negative voltage is applied on this pin. 5 SG This pin is the control ground. 6 PG This pin is the power ground. This pin is connected to the source of the low-side MOSFET. 7 LVCC This pin is the supply voltage of the control IC. 8 NC 9 HVCC This is the supply voltage of the high-side gate-drive circuit IC. 10 VCTR This is the drain of the low-side MOSFET. Typically, a transformer is connected to this pin. FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Pin Configuration No connection. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 3 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 VDS LVCC Parameter Min. Maximum Drain-to-Source Voltage (VDL-VCTR and VCTR-PG) FSFR2100 600 All Others 500 Low-side Supply Voltage Max. Unit V -0.3 25.0 V -0.3 25.0 V FSFR2100 -0.3 625.0 All Others -0.3 525.0 HVCC to VCTR High-side VCC Pin to Low-side Drain Voltage HVCC High-side Floating Supply Voltage VCON Control Pin Input Voltage -0.3 LVCC V VCS Current Sense (CS) Pin Input Voltage -5.0 1.0 V VRT RT Pin Input Voltage -0.3 5.0 V 50 V/ns dVCTR/dt PD Allowable Low-side MOSFET Drain Voltage Slew Rate Total Power Dissipation (3) FSFR2100 12.0 FSFR2000 12.0 FSFR1900 11.8 FSFR1800 11.7 FSFR1700 TJ TSTG Maximum Junction Temperature +150 (4) Storage Temperature Range W 11.6 (4) Recommended Operating Junction Temperature V -40 +130 -55 +150 °C °C MOSFET Section VDGR Drain Gate Voltage (RGS=1MΩ) VGS Gate Source (GND) Voltage IDM Drain Current Pulsed FSFR2000 Continuous Drain Current FSFR1900 FSFR1800 FSFR1700 © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 600 All Others 500 V ±30 FSFR2100 ID FSFR2100 FSFR2100 33 FSFR2000 31 FSFR1900 26 FSFR1800 23 FSFR1700 20 TC=25°C 11 TC=100°C 7 TC=25°C 9.5 TC=100°C 6 TC=25°C 8 TC=100°C 5 TC=25°C 7 TC=100°C 4.5 TC=25°C 6 TC=100°C 3.9 V A FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Absolute Maximum Ratings A www.fairchildsemi.com 4 Symbol Parameter Min. Max. Unit Package Section Torque Recommended Screw Torque 5~7 kgf·cm Notes: 3. Per MOSFET when both MOSFETs are conducting. 4. The maximum value of the recommended operating junction temperature is limited by thermal shutdown. Thermal Impedance TA=25°C unless otherwise specified. Symbol θJC Parameter Junction-to-Case Center Thermal Impedance (Both MOSFETs Conducting) © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 Value FSFR2100 10.44 FSFR2000 10.44 FSFR1900 10.56 FSFR1800 10.68 FSFR1700 10.79 Unit ºC/W FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Absolute Maximum Ratings (Continued) www.fairchildsemi.com 5 TA=25°C unless otherwise specified. Symbol Parameter Test Conditions Specifications Min. Typ. Unit Max. MOSFET Section FSFR2100 BVDSS Drain-to-Source Breakdown Voltage All Others RDS(ON) trr On-State Resistance Body Diode Reverse (5) Recovery Time ID=200μA, TA=25°C 600 650 ID=200μA, TA=125°C ID=200μA, TA=25°C V 500 ID=200μA, TA=125°C 540 FSFR2100 VGS=10V, ID=5.5A 0.32 0.38 FSFR2000 VGS=10V, ID=5.0A 0.53 0.67 FSFR1900 VGS=10V, ID=4.0A 0.74 0.85 FSFR1800 VGS=10V, ID=3.0A 0.77 0.95 FSFR1700 VGS=10V, ID=2.0A 1.00 1.25 FSFR2100 VGS=0V, IDiode=11.0A, dIDiode/dt=100A/μs 120 FSFR2000 VGS=0V, IDiode=9.5A, dIDiode/dt=100A/μs 125 FSFR1900 VGS=0V, IDiode=8.0A, dIDiode/dt=100A/μs 140 FSFR1800 VGS=0V, IDiode=7.0A, dIDiode/dt=100A/μs 160 FSFR1700 VGS=0V, IDiode=6.0A, dIDiode/dt=100A/μs 160 Ω ns Supply Section ILK Offset Supply Leakage Current H-VCC=VCTR=600V/500V 50 μA IQHVCC Quiescent HVCC Supply Current (HVCCUV+) - 0.1V 50 120 μA IQLVCC Quiescent LVCC Supply Current (LVCCUV+) - 0.1V 100 200 μA IOHVCC Operating HVCC Supply Current (RMS Value) fOSC=100KHz, VCON > 0.6V 6 9 mA No switching, VCON < 0.4V 100 200 μA IOLVCC Operating LVCC Supply Current (RMS Value) fOSC=100KHz, VCON > 0.6V 7 11 mA No switching, VCON < 0.4V 2 4 mA FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Electrical Characteristics UVLO Section LVCCUV+ LVCC Supply Under-Voltage Positive Going Threshold (LVCC Start) 13.0 14.5 16.0 V LVCCUV- LVCC Supply Under-Voltage Negative Going Threshold (LVCC Stop) 10.2 11.3 12.4 V LVCCUVH LVCC Supply Under-Voltage Hysteresis HVCCUV+ HVCC Supply Under-Voltage Positive Going Threshold (HVCC Start) 8.2 9.2 10.2 V HVCCUV- HVCC Supply Under-Voltage Negative Going Threshold (HVCC Stop) 7.8 8.7 9.6 V HVCCUVH HVCC Supply Under-Voltage Hysteresis © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 3.2 0.5 V V www.fairchildsemi.com 6 TA=25°C unless otherwise specified. Specifications Symbol Parameter Unit Test Conditions Min Typ Max Oscillator & Feedback Section VCONDIS Control Pin Disable Threshold Voltage 0.36 0.40 0.44 V VCONEN Control Pin Enable Threshold Voltage 0.54 0.60 0.66 V VRT V-I Converter Threshold Voltage 1.5 2.0 2.5 V fOSC Output Oscillation Frequency 94 100 106 KHz DC Output Duty Cycle 48 50 52 % fSS Internal Soft-Start Initial Frequency tSS Internal Soft-Start Time RT=5.2KΩ fSS=fOSC+40kHz, RT=5.2KΩ 140 KHz 2 3 4 ms Protection Section IOLP OLP Delay Current VCON=4V 3.6 4.8 6.0 μA VOLP OLP Protection Voltage VCON > 3.5V 4.5 5.0 5.5 V VOVP LVCC Over-Voltage Protection L-Vcc > 21V 21 23 25 V VAOCP AOCP Threshold Voltage ΔV/Δt=-0.1V/µs -1.0 -0.9 -0.8 V VCS < VAOCP; ΔV/Δt=-0.1V/µs (5) tBAO AOCP Blanking Time VOCP OCP Threshold Voltage V/Δt=-1V/µs VCS < VOCP; ΔV/Δt=-1V/µs (5) tBO OCP Blanking Time tDA Delay Time (Low Side) Detecting from VAOCP (5) to Switch Off TSD Thermal Shutdown Temperature ISU Protection Latch Sustain LVCC Supply Current VPRSET 50 -0.64 -0.58 -0.52 V 1.0 1.5 2.0 μs 250 400 ns 130 150 °C 100 150 μA ΔV/Δt=-1V/µs (5) 110 LVcc=7.5V Protection Latch Reset LVCC Supply Voltage ns 5 V FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Electrical Characteristics (Continued) Dead-Time Control Section DT Dead Time (6) 350 ns Notes: 5. This parameter, although guaranteed, is not tested in production. 6. These parameters, although guaranteed, are tested only in EDS (wafer test) process. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 7 1.1 1.1 1.05 1.05 Normalized at 25OC Normalized at 25OC These characteristic graphs are normalized at TA=25ºC. 1 0.95 1 0.95 0.9 0.9 -50 -25 0 25 50 75 -50 100 -25 0 O Temp ( C) Temp 50 75 100 (OC) Figure 5. Switching Frequency vs. Temp. 1.1 1.1 1.05 1.05 Normalized at 25OC Normalized at 25OC Figure 4. Low-side MOSFET Duty Cycle vs. Temp. 1 0.95 0.9 1 0.95 0.9 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temp (OC) Temp (OC) Figure 6. High-side VCC (HVCC) Start vs. Temp. Figure 7. High-side VCC (HVCC) Stop vs. Temp. 1.1 1.1 1.05 1.05 Normalized at 25OC Normalized at 25OC 25 1 0.95 FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Typical Performance Characteristics 1 0.95 0.9 0.9 -50 -25 0 25 50 75 100 -50 -25 0 25 50 75 100 Temp (OC) Temp (OC) Figure 8. Low-side VCC (LVCC) Start vs. Temp. Figure 9. Low-side VCC (LVCC) Stop vs. Temp. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 8 1.1 1.1 1.05 1.05 Normalized at 25OC Normalized at 25OC These characteristic graphs are normalized at TA=25ºC. 1 0.95 0.95 0.9 0.9 -50 -25 0 25 50 75 -50 100 -25 0 50 75 100 Temp (OC) Figure 10. OLP Delay Current vs. Temp. Figure 11. OLP Protection Voltage vs. Temp. 1.1 1.1 1.05 1.05 1 0.95 1 0.95 0.9 0.9 -50 -25 0 25 50 75 -50 100 -25 0 Temp (OC) 25 Temp Figure 12. LVCC OVP Voltage vs. Temp. 50 75 100 (OC) Figure 13. RT Voltage vs. Temp. 1.1 1.1 1.05 1.05 Normalized at 25OC Normalized at 25OC 25 Temp (OC) Normalized at 25OC Normalized at 25OC 1 1 0.95 0.9 FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Typical Performance Characteristics (Continued) 1 0.95 0.9 -50 -25 0 25 50 75 -50 100 -25 0 25 50 75 100 Temp (OC) Temp (OC) Figure 14. CON Pin Enable Voltage vs. Temp. Figure 15. OCP Voltage vs. Temp. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 9 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. Gain 1.8 f min f max f normal f ISS 1.6 Dead time High side MOSFET gate drive 1.4 1.2 Low side MOSFET gate drve 1.0 Soft-start 0.8 time Figure 16. MOSFETs Gate Drive Signal 0.6 60 70 80 90 100 110 120 140 130 150 freq (kHz) 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: Figure 17. Current Controlled Oscillator f min = 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 in the ZVS region. 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. 5.2k Ω × 100(kHz ) Rmin (1) FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Functional Description Assuming the saturation voltage of opto-coupler transistor is 0.2V, the maximum switching frequency is determined as: f max = ( 5.2k Ω 4.68k Ω + ) × 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 © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 10 f ISS = ( 5.2k Ω 5.2k Ω ) × 100 + 40 (kHz ) (3) + Rmin RSS It is typical to set the initial frequency of soft-start two ~ three times the resonant frequency (fO) of the resonant network. The soft-start time is three to four times of the RC time constant. The RC time constant is as follows: TSS = RSS ⋅ CSS Figure 22. Control Pin Configuration for Pulse Skipping (4) 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. fs f ISS 40kHz Control loop take over time Figure 20. Frequency Sweeping of Soft-start 4. Control Pin: The FSFR-series has a control pin for protection, cycle skipping, and remote on/off. Figure 21 shows the internal block diagram for control pin. Figure 23. Remote On / Off Circuit 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. 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 = 5.2 k 4.16 k + R min R max © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 x100 (kHz) FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter 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 cycles, which adds 40kHz to the initial frequency of the external soft-start circuit, as shown in Figure 20. The initial frequency of the soft-start is given as: 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 11.3V, the protection is reset. The FPS resumes normal operation when LVCC reaches the start voltage of 14.5V. (5) www.fairchildsemi.com 11 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 = I p p− p (6) 2π f sCr To minimize power dissipation, a capacitive voltage divider is generally used for capacitor voltage sensing, as shown in Figure 27. Figure 24. Protection Blocks Np CON 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. Cd Control IC Ns Ip Rd SG Cr PG Ns 100 VSENSE Np CB Ns Cr CSENSE Ip Ns Control IC VCS Ids CS SG VCr PG VCrp-p Rsense VCS Ids Vsense Vsense pk CB = VCr p − p Csense + CB Vsense pk = VCON 2 Vsensepk Figure 25. Half-wave Sensing VCON Ids FSFR-Series — Fairchild Power Switch (FPS™) 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. 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 the MOSFETs remain off. This protection has a shutdown time delay of 1.5µs to prevent premature shutdown during startup. Cr Control IC VCS Np CS PG SG Rsense Ns 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 Ns Ids Figure 26. Full-wave Sensing © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 12 6. PCB Layout Guideline: Duty unbalance problems may occur due to the radiated noise from main transformer, the inequality of the secondary side leakage inductances of main transformer, and so on. Among them, it is one of the dominant reasons that the control components in the vicinity of RT pin are enclosed by the primary current flow pattern on PCB layout. The direction of the magnetic field on the components caused by the primary current flow is changed when the high and low side MOSFET turns on by turns. The magnetic fields with opposite direction from each other induce a current through, into, or out of the RT pin, which makes the turnon duration of each MOSFET different. It is highly recommended to separate the control components in the vicinity of RT pin from the primary current flow pattern on PCB layout. Figure 28 shows an example for the duty balanced case. 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: VCON = where VCr voltage. p-p CB VCr p − p 2(CB + Csense ) (7) is the amplitude of the resonant capacitor 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 130°C, the thermal shutdown triggers. © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 Figure 28. Example for Duty Balancing FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter drops below -0.9V. This protection is latch mode and reset when LVCC is pulled down below 5V. www.fairchildsemi.com 13 Application FPS™ Device Input Voltage Range Rated Output Power Output Voltage (Rated Current) LCD TV FSFR2100 400V (20ms hold-up time) 192W 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 22nF/ 630V Brownout circuit D211 FYP2010DN EER3542 VCC=16~20VDC 1 C109 22µF U5 R114 10k R109 1M R112 10k U4 ZD101 6.8V R110 1M C111 330n/ 275VAC LVCC HVCC Line Filter R108 open R107 2.2k U2 C108 12nF Vin=340~390Vdc Control IC 8 9 VCTR D212 FYP2010DN CS U3 KA431 JP1, 0 R102 1kΩ SG PG C204 12nF R204 62k R206 2k U2 C203 47nF R203 33k C301 R205 7k C103 100pF R101 0.2Ω Figure 29. Typical Application Circuit © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 R201 10k R202 1k C104 open R103, 0 C110 330n/ 275VAC NTC 5D-9 F101 3.15A/ 250V CON C106 150nF VO 12, 13 D101 1N4937 VDL C107 10µF R105 7.5k C201 2200µF 35V R106 27 C105 0.33µF/ 50V RT R104 5.1k 16 JP2, 0 C112 680pF R111 45k C101 220uF/ 450V C202 2200µF 35V R113 400k VCC FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Typical Application Circuit (Half-bridge LLC Resonant Converter) www.fairchildsemi.com 14 Usually, LLC resonant converters require large leakage inductance value. To obtain a large leakage inductance, sectional winding method is used. 2 Core: EER3542 (Ae=107 mm ) Bobbin: EER3542 (Horizontal) Figure 30. Transformer Construction Pin (S → F) Wire Turns Winding Method Np 8→1 0.12φ×30 (Litz wire) 36 Section winding Ns1 12 → 9 0.1φ×100 (Litz wire) 4 Section winding Ns2 16 → 13 0.1φ×100 (Litz wire) 4 Section winding Pin Specification Primary-side Inductance (Lp) 1－8 630μH ± 5% 100kHz, 1V Primary-side Effective Leakage (Lr) 1－8 135μH ± 5%. Short one of the secondary windings © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 Remark FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Typical Application Circuit (Continued) www.fairchildsemi.com 15 FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter Physical Dimensions SIPMODAA09RevA Figure 31. 9-SIP Package Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 16 FSFR-Series — Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converter © 2007 Fairchild Semiconductor Corporation FSFR series • 1.0.3 www.fairchildsemi.com 17