FAN7311B LCD Backlight Inverter Drive IC Features Description High-Efficiency Single-Stage Power Conversion The FAN7311B provides all the control functions for a series parallel resonant converter as well as a pulse width modulation (PWM) controller to develop a supply voltage. Typical operating frequency range is between 30kHz and 250kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. The FAN7311B uses a new patent-pending phaseshift control. Wide Input Voltage Range: 5V to 25.5V Backlight Lamp Ballast and Soft Dimming Reduced Number of Required External Components Precision Voltage Reference Trimmed to 2% ZVS Full-Bridge Topology Soft-Start Capability PWM Control at Fixed Frequency Analog and Burst Dimming Function Programmable Striking Frequency 20-SOIC Open-Lamp Protection Open-Lamp Regulation 20-Pin SOIC Applications LCD TV LCD Monitor Ordering Information Package Pb-Free FAN7311BM Part Number 20-SOIC Yes FAN7311BMX 20-SOIC Yes Operating Temperature Range -25°C to 85°C Packing Method Rail Tape & Reel Protected by U.S. Patent: 5,652,479; 7,158,390. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC January 2007 RT OUTA OSCILLATOR Output Driver max. 2V min. 0.5V CT 6μA PGND OUTC S_S Output Driver MRT1 RT1 Striking Logic S_S 1.4μA UVLO ADIM + + Q Error Amp. SET CLR UVLO R Sburst 85μA Va+α max. 2V min. 0.5V Positive dimming polarity Voltage Reference & Internal Bias + AGND + Solr 105μA VOLP 2.5V 1.5V 2.5V Solr OLP VOLP+α S Q - EA_IN BDIM OUTD OLP EA_OUT BCT OUTB Output Control Logic + + - OLR 2V 2.5VREF REF ENA + Sburst - VIN VIN + UVLO - 1.4V UVLO 5V FAN7311B Rev.00 Figure 1. Functional Block Diagram of FAN7311B © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 2 FAN7311B LCD Backlight Inverter Drive IC Internal Block Diagram FAN7311B LCD Backlight Inverter Drive IC Pin Assignments RT1 OUTB OUTA 20 19 VIN 18 17 PGND OUTC 16 15 OUTD 14 CT RT BCT 13 12 11 9 10 FAN7311B 1 2 3 4 5 6 7 8 OLP OLR ENA S_S GND REF ADIM BDIM EA_IN EA_OUT FAN7311B Rev. 00 Figure 2. Pin Configuration (Top View) Pin Definitions Pin # Name 1 OLP 2 3 Description Pin # Name Open-Lamp Protection 11 BCT OLR Open-Lamp Regulation 12 RT Timing Resistor ENA Enable Input 13 CT Timing Capacitor 4 S_S Soft-Start 14 OUTD NMOSFET Drive Output D 5 GND Analog Ground 15 OUTC PMOSFET Drive Output C 6 REF 2.5V Reference Voltage 16 PGND Power Ground 7 ADIM Analog Dimming Input 17 VIN Supply Voltage 8 BDIM Burst Dimming Input 18 OUTA PMOSFET Drive Output A 9 EA_IN Error Amplifier Input 19 OUTB NMOSFET Drive Output B 10 EA_OUT Error Amplifier Output 20 RT1 Striking Frequency Resistor © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 Description Burst Dimming Timing Capacitor 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. For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Symbol Value Unit VIN Supply Voltage Parameter 5 to 25.5 V TA Operating Temperature Range -25 to 85 °C TJ Junction Temperature 150 °C TSTG Storage Temperature Range -65 to 150 °C θJA(1) Thermal Resistance Junction-to-Ambient (still air) 70 °C/W Power Dissipation 1.8 W PD Notes: 1. Thermal resistance test board size: 76.2 * 114.3 * 1.6mm (1S0P). JEDEC standard: JESD51-2, JESD51-3. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 4 FAN7311B LCD Backlight Inverter Drive IC Absolute Maximum Ratings For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Specifications from -25°C to 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Condition Min. Typ. Max. Unit 2 25 mV 2.45 2.50 2.55 V TA = 25°C, CT = 270pF, RT = 18kΩ 110.4 115.0 119.6 CT = 270pF, RT = 18kΩ 108 115 122 REFERENCE SECTION (Recommend X7R Capacitor) 5 ≤ VIN ≤ 25.5V ΔVref Line Regulation V25 2.5V Regulation Voltage OSCILLATOR SECTION (MAIN) fosc Oscillation Frequency kHz Vcth CT High Voltage 2.0 V Vctl CT Low Voltage 0.5 V OSCILLATOR SECTION (BURST) foscb Oscillation Frequency TA = 25°C, CTB = 10nF, RT=18kΩ 209.25 225.00 240.75 CTB = 10nF, RT=18kΩ 206.25 225.00 241.75 Hz Vbcth BCT High Voltage 2 V Vbctl BCT Low Voltage 0.5 V 80 dB 1.5 MHz ERROR AMP SECTION Av Open Loop Gain(2) Bandwidth(2) GBW Unit Gain Veh Feedback Output High Voltage EA_IN = 0V lsin Output Sink Current EA_OUT = 1.5V lsur Output Source Current EA_OUT = 1.5V Iolr EA_IN Driving Current on OLR 2.00 EA_IN Driving Current on Burst Dimming Vfbh Feedback High Voltage on Burst Dimming R(EA_IN) = 60kΩ 2.54 V -1 mA 1 75 Iburst 2.27 mA 105 135 µA 61 85 109 µA Va+0.1 Va+0.4 Va+0.7 V 4 6 8 µA SOFT-START SECTION ISS Vssh Soft-Start Current Soft-Start Clamping S_S=1V Voltage(2) 4 V PROTECTION SECTION Volp0 Open-Lamp Protection Voltage 0 Start at open lamp 2.2 2.5 2.8 V Volp1 Open-Lamp Protection Voltage 1 Normal -> open lamp 1.3 1.5 1.7 V Volr Open-Lamp Regulation Voltage 1.75 2.00 2.25 V Iolp Open-Lamp Protection Charging Current 0.7 1.4 2.1 µA 5 V UNDER-VOLTAGE LOCKOUT SECTION Vth Start Threshold Voltage Ist Start-up Current VIN = Vth-0.2 130 180 µA Iop Operating Supply Current VIN = 12V 1.5 4.0 mA Isb Stand-by Current VIN = 12V 200 370 µA Note: 2. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 5 FAN7311B LCD Backlight Inverter Drive IC Electrical Characteristics For typical values, TA=25°C and VIN=12V. For min. and max. values, TA is the operating ambient temperature range with -25°C ≤ TA ≤ 85°C and 5V ≤ VIN ≤ 25.5V, unless otherwise specified. Specifications from -25°C to 85°C are guaranteed by design based on final characterization results. Symbol Parameter Test Condition Min. Typ. Max. Unit 5 V 0.7 V ON/OFF SECTION Von On State Input Voltage Voff Off Stage Input Voltage 2 OUTPUT SECTION Vpdhv PMOS Gate High Voltage VIN = 12V Vphlv PMOS Gate Low Voltage VIN = 12V Vndhv NMOS Gate Drive Voltage VIN = 12V Vndhv NMOS Gate Drive Voltage VIN = 12V Vpuv PMOS Gate Voltage with UVLO Activated VIN = Vth-0.2 Vnuv NMOS Gate Voltage with UVLO Activated VIN = Vth-0.2 tr Rising Time(3) VIN = 12V, CL=2nF tf Falling Time(3) VIN = 12V, CL=2nF VIN VIN-10.5 VIN-8.5 6.5 8.5 V VIN-6.5 10.5 0 V V V VIN-0.3 V 0.3 V 200 500 ns 200 500 ns MAX./MIN. OVERLAP Min. Overlap Between Diagonal Switches(3) fosc = 100kHz 0 % Max. Overlap Between Diagonal Switches(3) fosc = 100kHz 100 % PDR_A/NDR_B(3) RT = 18kΩ 450 ns PDR_C/NDR_D(3) RT = 18kΩ 450 ns DELAY TIME Note: 3. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 6 FAN7311B LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) FAN7311B LCD Backlight Inverter Drive IC Function Description UVLO: The under-voltage lockout circuit guarantees stable operation of the IC’s control circuit by stopping and starting it as a function of the VIN value. The UVLO circuit turns on the control circuit when VIN exceeds 5V. When VIN is lower than 5V, the IC’s standby current is less than 200µA. ENA: Applying voltage higher than 2V to the ENA pin enables operation of the IC. Applying voltage lower than 0.7V to the ENA pin disables operation of the inverter. Soft-Start: The soft-start function requires that the S_S pin is connected through a capacitor to GND. A soft-start circuit ensures a gradual increase in the input and output power. The capacitor connected to the S_S pin determines the rate at which the duty ratio rises. It is charged by a 6µA current source. Figure 4. Main Oscillator Waveform Burst Oscillator & Burst Dimming: The timing capacitors (BCTs) are charged by the reference current source, which is formed by the timing resistor (RT). The timing resistor’s voltage is regulated at 1.25V. The sawtooth waveform charges up to 2V. Once this voltage is reached, the capacitors begin discharging down to 0.5V. Next, the timing capacitors start charging again and a new switching cycle begins. The burst dimming frequency can be programmed by adjusting the RT and BCT values. The burst dimming frequency can be calculated as shown in Equation 2. fburst = Figure 3. Soft-Start During Initial Operation 19 32 ⋅ RT ⋅ C T By comparing the input of BDIM pin with the 0.5~2V triangular wave of the burst oscillator, the PWM pulses for burst dimming. The PWM pulse controls EA_OUT’s voltage by summing 85µA into the EA_IN pin. (1) © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 (2) To avoid visible flicker, the burst dimming frequency should be greater than 120Hz. Main Oscillator: The timing capacitors (CTs) are charged by the reference current source, which is formed by the timing resistor (RT). The timing resistor’s voltage is regulated at 1.25V. The sawtooth waveform charges up to 2V. Once this voltage is reached, the capacitors begin discharging down to 0.5V. Next, the timing capacitors start charging again and a new switching cycle begins. The main frequency can be programmed by adjusting the RT and CT values. The main frequency can be calculated as shown below. f op = 3.75 96 ⋅ RT ⋅ CT www.fairchildsemi.com 7 Figure 7. OLR Voltage During Striking Mode Output Drives: The four output drives are designed so that switches A and B, C and D never turn on simultaneously. The OUTA-OUTB pair is intended to drive one half-bridge in the external power stage. The OUTCOUTD pair drives the other half-bridge. VIN 8.5V 8.5V VIN 8.5V Figure 6. Burst Dimming Open Lamp Regulation and Open-Lamp Protection: It is necessary to suspend power stage operation if an open lamp occurs because the power stage has high gain. When a voltage higher than 2V is applied to the OLR pin, the part enters regulation mode and controls the EA_OUT voltage. This limits the lamp voltage by summing 105µA into the feedback node. At the same time, the OLP capacitor, connected to the OLP pin, is charged by the 1.4µA internal current source. Once it reaches 2.5V, the IC enters shutdown where all output is high. 8.5V Figure 8. Phase-Shift Control Waveforms © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 8 FAN7311B LCD Backlight Inverter Drive IC Figure 5. Burst Oscillator Waveform The FAN7311B uses the improved phase-shift control full-bridge to drive CCFL. As a result, the temperature difference between the left and the right leg is almost zero. The detail timing is shown below. EA_OUT CT SYNC T T1 POUT A NOUT B POUT C NOUT D FAN7311 Rev.04 Figure 9. Phase-Shift Control Waveforms © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 9 FAN7311B LCD Backlight Inverter Drive IC Timing Diagram Application Lamps Input Voltage 19-inch LCD Monitor 4 13V 1. Schematic F1 FUSE C22 220u 25V C25 1u C27 1u M1 CN5 C26 1 2 3 4 5 6 7 8 9 10 IC1 0 FAN7311B 1n R6 12V OLP R T1 OLR OUTB ON/OFF 10k ENA OUTA RT 0 0 0 0 10k GND 0 1u R2 56k R4 S_S VIN 0 REF OUTC ADIM OUTD R27 0 10k R5 27k 4.7n DP C7 10u LTM190EX TX1 1 C N1 C CFL C4 4.7n DN GN DN SP DP GP DP C OLD HOT C N2 C CFL C10 15p 2 C11 15p COLD OLP2 FDS8958A 0 BC T SN OLP1 0 RT EA_OU T H OT 2 1 0 0 CT EA_IN 0 DP GP J1 C3 0 DN SP 0 M2 C5 220p R3 75k GN 0 C8 10u PGND BDIM C21 10n DN FDS8958A 0 1u R7 0 56k SN OUTA C6 C2 REF DIM (0~3.3V ) 0.22u R25 OUTB C1 C28 10n 0 56k R24 12505WR-10 0 D4 BAV70 OLR R26 1k RT R8 C14 12n R13 1k D6 BAV99 C30 12n D7 BAV99 R16 1k R 17 1k R15 FB 10k 100k 0 0 0 R9 9.1k 0 0 0 FB 1 C N3 C CFL 1 REF OLP1 R22 10k OLP2 C N4 C CFL 2 R23 10k C12 15p COLD C13 15p D11 BAW56 C OLD HOT 0 R1 330k Q1 C9 1u H OT 2 R14 100k OLP 0 TX2 0 OLR 0 OLP3 OLP4 KST2222 OLP3 D1 BAW56 0 OLP4 C19 2.2n C20 2.2n OLR R20 10k R21 10k 0 D3 BAV70 R1 2 0 1k D10 BAW56 0 C18 2.2n 0 R11 1k 0 C1 5 12n 0 0 D9 BAV99 R18 1k 0 0 R 19 1k 0 FB C17 2.2n 0 C29 12n D8 BAV99 0 Figure 10. Typical Application Circuit 2. Transformer Schematic Diagram - Supported by Namyang electronics (http://www.namyangelec.co.kr) FAN7311 Rev. 04 Figure 11. Transformer Schematic 3. Core & Bobbin Core: EFD2124 Material: PL7 Bobbin: EFE2124 © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 10 FAN7311B LCD Backlight Inverter Drive IC Typical Application Circuits Pin No. Wire Turns Inductance Leakage Inductance Remarks 5 --> 2 1 UEW 0.45 φ 19 115µH 21.5µH 1KHz, 1V 7 --> 9 1 UEW 0.04 φ 2300 1.5H 280mH 1KHz, 1V 5. BOM of the Application Circuit Part Ref. Value Description / Vendor Fuse F1 24V 3A Fuse Resistor (SMD) Part Ref. Value Description / Vendor C5 220pF 50V 1608 J C6 1µF 50V 2012 K C7 10µF 16V 3216 R1 330kΩ 1608 J C8 10µF 16V 3216 R2 56kΩ 1608 F C9 1µF 16V 1608 K R3 75kΩ 1608 F C10 15pF 3KV 3216 R4 56kΩ 1608 F C11 15pF 3KV 3216 R5 27kΩ 1608 F C12 15pF 3KV 3216 R6 82kΩ 1608 F C13 15pF 3KV 3216 R8 100kΩ 1608 F C14 10nF 50V 1608 K R9 9.1kΩ 1608 F C15 10nF 50V 1608 K R11 1kΩ 1608 F C17 2.2nF 50V 1608 Z R12 1kΩ 1608 F C18 2.2nF 50V 1608 Z R13 1kΩ 1608 F C19 2.2nF 50V 1608 Z R14 100kΩ 1608 F C20 2.2nF 50V 1608 Z R15 10kΩ 1608 F C21 10nF 50V 1608 Z R16 1kΩ 1608 F C25 1µF 50V 2012 K R17 1kΩ 1608 F C26 0.1µF 16V 1608 K R18 1kΩ 1608 F C27 1µF 50V 2012 K R19 1kΩ 1608 F C28 10nF 50V 1608 Z R20 10kΩ 1608 J C29 10nF 50V 1608 K R21 10kΩ 1608 J C30 10nF 50V 1608 K R22 10kΩ 1608 J R23 10kΩ 1608 J D1 BAW56 Fairchild Semiconductor R24 10kΩ 1608 J D3 BAV70 Fairchild Semiconductor R25 10kΩ 1608 J D4 BAV70 Fairchild Semiconductor R26 1kΩ 1608 F D6 BAV99 Fairchild Semiconductor R27 10kΩ 1608 J D7 BAV99 Fairchild Semiconductor D8 BAV99 Fairchild Semiconductor Diode / TR (SMD) Capacitor (SMD) C1 0.22µF 16V 1608 K D9 BAV99 Fairchild Semiconductor C2 1µF 50V 2012 K D10 BAW56 Fairchild Semiconductor C3 4.7nF 50V 1608 K D11 BAW56 Fairchild Semiconductor C4 4.7nF 50V 1608 K Q1 KST2222 Fairchild Semiconductor © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 11 FAN7311B LCD Backlight Inverter Drive IC 4. Winding Specification Part Ref. Value Description / Vendor Part Ref. Electrolytic capacitor 220µF M1 FDS8958A 25V Fairchild Semiconductor M2 FDS8958A Fairchild Semiconductor MOSFET (SMD) Transformer (SMD) EFD2124 TX2 EFD2124 CN1 35001WR-02A CN2 35001WR-02A CN3 35001WR-02A CN4 35001WR-02A CN5 12505WR-10 Supported by Namyang electronics (http://www.namyangelec.co.kr) © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 Description / Vendor Wafer (SMD) C22 TX1 Value www.fairchildsemi.com 12 FAN7311B LCD Backlight Inverter Drive IC 5. BOM of the Application Circuit (Continued) 20-SOIC Dimensions are in millimeters unless otherwise specified. Inches Symbol Millimeters Min. Max. Min. Max. A A1 B C D .093 .004 .013 .009 .496 .104 .012 2.35 0.10 0.33 0.23 12.60 2.65 0.30 E e H h L N α ccc .291 .299 .050 BSC 7.40 7.60 1.27 BSC .394 .010 .016 10.00 0.25 0.40 .020 .013 .512 .419 .029 .050 20 Notes 0.51 0.32 13.00 5 2 2 10.65 0.75 1.27 3 6 20 0° 8° 0° 8° — .004 — 0.10 Notes: 1. Dimensioning and tolerancing per ANSI Y14.5M-1982. 2. "D" and "E" do not include mold flash. Mold flash or protrusions shall not exceed .010 inch (0.25mm). 3. "L" is the length of terminal for soldering to a substrate. 4. Terminal numbers are shown for reference only. 5. "C" dimension does not include solder finish thickness. 20 6. Symbol "N" is the maximum number of terminals. 11 E 1 H 10 D h x 45° A1 A C e SEATING PLANE B –C– α LEAD COPLANARITY ccc C L January 2001, Rev. A soic20_dim.pdf Figure 12. 20-Lead Small Outline Integrated Circuit (SOIC) © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 13 FAN7311B LCD Backlight Inverter Drive IC Mechanical Dimensions The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. FACT Quiet Series™ GlobalOptoisolator™ GTO™ HiSeC™ I2C™ i-Lo™ ImpliedDisconnect™ IntelliMAX™ ISOPLANAR™ LittleFET™ MICROCOUPLER™ MicroFET™ MicroPak™ MICROWIRE™ MSX™ MSXPro™ Across the board. Around the world.™ The Power Franchise® Programmable Active Droop™ ACEx™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ DOME™ EcoSPARK™ E2CMOS™ EnSigna™ FACT® FAST® FASTr™ FPS™ FRFET™ OCX™ OCXPro™ OPTOLOGIC® OPTOPLANAR™ PACMAN™ POP™ Power247™ PowerEdge™ PowerSaver™ PowerTrench® QFET® QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ µSerDes™ ScalarPump™ SILENT SWITCHER® SMART START™ SPM™ Stealth™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TCM™ TinyBoost™ TinyBuck™ TinyPWM™ TinyPower™ TinyLogic® TINYOPTO™ TruTranslation™ UHC® UniFET™ VCX™ Wire™ 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, or (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 significant injury to the user. 2. A critical component is 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 Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and 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. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I22 © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 www.fairchildsemi.com 14 FAN7311B LCD Backlight Inverter Drive IC FAIRCHILD SEMICONDUCTOR TRADEMARKS