FAN7311BMX

FAN7311B LCD Backlight Inverter Drive IC January 2007 FAN7311B LCD Backlight Inverter Drive IC Features High-Efficiency Single-Stage Power Conversion 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 Open-Lamp Protection Open-Lamp Regulation 20-Pin SOIC Description 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. 20-SOIC Applications LCD TV LCD Monitor Ordering Information Part Number FAN7311BM FAN7311BMX Package 20-SOIC 20-SOIC Pb-Free Yes 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 Internal Block Diagram RT max. 2V min. 0.5V 6μA S_S MRT1 OSCILLATOR Output Driver + + Output Control Logic Output Driver Striking Logic OLP S_S 1.4μA UVLO + 2.5V Solr 105μA Voltage Reference & Internal Bias Sburst VIN UVLO + OUTA OUTB PGND OUTC OUTD CT RT1 EA_OUT ADIM EA_IN Error Amp. + Q SET S Q CLR VOLP+α VOLP 2.5V 1.5V OLP R UVLO + Solr 2.5VREF OLR 2V REF - max. 2V min. 0.5V Positive dimming polarity Sburst 85μA Va+α BCT BDIM AGND + + - ENA 1.4V VIN UVLO 5V FAN7311B Rev.00 Figure 1. Functional Block Diagram of FAN7311B © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 2 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Pin Assignments RT1 20 OUTB OUTA 19 18 VIN 17 PGND OUTC 16 15 OUTD 14 CT 13 RT 12 BCT 11 FAN7311B 1 OLP 2 OLR 3 ENA 4 S_S 5 GND 6 REF 7 ADIM 8 BDIM 9 10 EA_IN EA_OUT FAN7311B Rev. 00 Figure 2. Pin Configuration (Top View) Pin Definitions Pin # 1 2 3 4 5 6 7 8 9 10 Name OLP OLR ENA S_S GND REF ADIM BDIM EA_IN EA_OUT Description Open-Lamp Protection Open-Lamp Regulation Enable Input Soft-Start Analog Ground 2.5V Reference Voltage Analog Dimming Input Burst Dimming Input Error Amplifier Input Error Amplifier Output Pin # 11 12 13 14 15 16 17 18 19 20 Name BCT RT CT OUTD OUTC PGND VIN OUTA OUTB RT1 Description Burst Dimming Timing Capacitor Timing Resistor Timing Capacitor NMOSFET Drive Output D PMOSFET Drive Output C Power Ground Supply Voltage PMOSFET Drive Output A NMOSFET Drive Output B Striking Frequency Resistor © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 3 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC 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. 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 VIN TA TJ TSTG θJA(1) PD Supply Voltage Parameter Operating Temperature Range Junction Temperature Storage Temperature Range Thermal Resistance Junction-to-Ambient (still air) Power Dissipation Value 5 to 25.5 -25 to 85 150 -65 to 150 70 1.8 Unit V °C °C °C °C/W W 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 4 www.fairchildsemi.com 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 ΔVref V25 Parameter Line Regulation 2.5V Regulation Voltage Test Condition 5 ≤ VIN ≤ 25.5V Min. Typ. 2 Max. 25 2.55 Unit mV V REFERENCE SECTION (Recommend X7R Capacitor) 2.45 TA = 25°C, CT = 270pF, RT = 18kΩ CT = 270pF, RT = 18kΩ Vcth Vctl CT High Voltage CT Low Voltage TA = 25°C, CTB = 10nF, RT=18kΩ CTB = 10nF, RT=18kΩ Vbcth Vbctl Av GBW Veh lsin lsur Iolr Iburst Vfbh ISS Vssh Volp0 Volp1 Volr Iolp Vth Ist Iop Isb BCT High Voltage BCT Low Voltage Open Loop Gain(2) Unit Gain Bandwidth(2) EA_IN = 0V EA_OUT = 1.5V EA_OUT = 1.5V 1 75 61 Va+0.1 4 105 85 Va+0.4 6 4 Start at open lamp Normal -> open lamp 2.2 1.3 1.75 0.7 2.5 1.5 2.00 1.4 2.8 1.7 2.25 2.1 5 VIN = Vth-0.2 VIN = 12V VIN = 12V 130 1.5 200 180 4.0 370 135 109 Va+0.7 8 2.00 Feedback Output High Voltage Output Sink Current Output Source Current EA_IN Driving Current on OLR EA_IN Driving Current on Burst Dimming Feedback High Voltage on Burst Dimming R(EA_IN) = 60kΩ Soft-Start Current Soft-Start Clamping Voltage(2) S_S=1V 2.50 OSCILLATOR SECTION (MAIN) fosc Oscillation Frequency 110.4 108 115.0 115 2.0 0.5 119.6 122 V V kHz OSCILLATOR SECTION (BURST) foscb Oscillation Frequency 209.25 206.25 225.00 225.00 2 0.5 80 1.5 2.27 2.54 -1 240.75 241.75 V V dB MHz V mA mA µA µA V µA V V V V µA V µA mA µA Hz ERROR AMP SECTION SOFT-START SECTION PROTECTION SECTION Open-Lamp Protection Voltage 0 Open-Lamp Protection Voltage 1 Open-Lamp Regulation Voltage Open-Lamp Protection Charging Current Start Threshold Voltage Start-up Current Operating Supply Current Stand-by Current UNDER-VOLTAGE LOCKOUT SECTION Note: 2. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 5 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) 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 ON/OFF SECTION Von Voff Vpdhv Vphlv Vndhv Vndhv Vpuv Vnuv tr tf Parameter On State Input Voltage Off Stage Input Voltage PMOS Gate High Voltage PMOS Gate Low Voltage NMOS Gate Drive Voltage NMOS Gate Drive Voltage Test Condition Min. 2 Typ. Max. 5 0.7 Unit V V V OUTPUT SECTION VIN = 12V VIN = 12V VIN = 12V VIN = 12V VIN-0.3 0.3 200 200 500 500 6.5 VIN VIN-10.5 VIN-8.5 8.5 0 VIN-6.5 10.5 V V V V V ns ns PMOS Gate Voltage with UVLO Activated VIN = Vth-0.2 NMOS Gate Voltage with UVLO Activated VIN = Vth-0.2 Rising Time(3) VIN = 12V, CL=2nF VIN = 12V, CL=2nF Falling Time(3) Min. Overlap Between Diagonal Switches(3) Max. Overlap Between Diagonal Switches(3) MAX./MIN. OVERLAP fosc = 100kHz fosc = 100kHz 0 100 % % DELAY TIME PDR_A/NDR_B(3) PDR_C/NDR_D(3) RT = 18kΩ RT = 18kΩ 450 450 ns ns Note: 3. These parameters, although guaranteed, are not 100% tested in production. © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 6 www.fairchildsemi.com 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 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. 3.75 96 ⋅ RT ⋅ CT (2) To avoid visible flicker, the burst dimming frequency should be greater than 120Hz. 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. f op = 19 32 ⋅ RT ⋅ C T (1) © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 7 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Figure 5. Burst Oscillator Waveform 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 8 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Timing Diagram 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 9 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Typical Application Circuits Application 19-inch LCD Monitor Lamps 4 Input Voltage 13V 1. Schematic F1 FUSE C22 220u 25V CN5 1 2 3 4 5 6 7 8 9 10 12505WR-10 C26 C25 1u M1 C27 1u 0 12V IC1 OLP OLR FAN7311B 1n R6 R T1 OUTB OUTA VIN PGND OUTC OUTD C5 220p 56k 0 RT 0 SN DN 0 0 OUTB OUTA C6 R25 10k GN DN R24 SP DP C7 10u ON/OFF 10k C28 10n C1 ENA GP DP LTM190EX TX1 1 H OT C N1 C CF L 2 1 C OLD 0 0 0.22u S_S GND 1u 0 0 J1 FDS8958A C8 10u M2 0 DIM (0~3.3V ) REF 0 C2 0 R2 56k 1u R7 0 REF ADIM BDIM 0 0 SN DN HOT C N2 C CFL R4 56k C21 10n R3 75k R27 GN DN DP C10 15p C11 15p 2 COLD CT R5 27k RT C4 4.7n BC T RT R8 100k 0 0 0 10k SP OLP1 GP DP OLP2 EA_IN C3 EA_OU T FDS8958A OLR D4 BAV70 R26 1k R15 FB 10k R9 9.1k C14 12n R13 1k C30 12n D6 BAV99 R16 1k D7 BAV99 R 17 1k 0 0 4.7n 0 0 0 FB 0 0 0 0 0 OLR R14 100k 0 TX2 1 H OT C N3 C CF L 2 1 OLP1 OLP2 2 C12 15p C13 15p OLP3 C19 2.2n C20 2.2n OLR D3 BAV70 HOT C N4 C CFL COLD C OLD REF 0 OLP Q1 D11 BAW56 C9 1u KST2222 OLP3 D1 BAW56 R20 10k D10 BAW56 C18 2.2n C17 2.2n R21 10k OLP4 R1 330k R22 10k R23 10k OLP4 0 0 R1 2 1k C29 12n R11 1k C1 5 12n D8 BAV99 R18 1k D9 BAV99 R 19 1k 0 0 0 0 FB 0 0 0 0 0 0 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 10 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC 4. Winding Specification Pin No. 5 --> 2 7 --> 9 Wire 1 UEW 0.45 φ 1 UEW 0.04 φ Turns 19 2300 Inductance 115µH 1.5H Leakage Inductance 21.5µH 280mH Remarks 1KHz, 1V 1KHz, 1V 5. BOM of the Application Circuit Part Ref. F1 R1 R2 R3 R4 R5 R6 R8 R9 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 C1 C2 C3 C4 Value Fuse 24V 3A Description / Vendor Fuse 1608 J 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 F 1608 J 1608 J 1608 J 1608 J 1608 J 1608 J 1608 F 1608 J 16V 1608 K 50V 2012 K 50V 1608 K 50V 1608 K Part Ref. C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C17 C18 C19 C20 C21 C25 C26 C27 C28 C29 C30 D1 D3 D4 D6 D7 D8 D9 D10 D11 Q1 Value 220pF 1µF 10µF 10µF 1µF 15pF 15pF 15pF 15pF 10nF 10nF 2.2nF 2.2nF 2.2nF 2.2nF 10nF 1µF 0.1µF 1µF 10nF 10nF 10nF Description / Vendor 50V 1608 J 50V 2012 K 16V 3216 16V 3216 16V 1608 K 3KV 3216 3KV 3216 3KV 3216 3KV 3216 50V 1608 K 50V 1608 K 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 1608 Z 50V 2012 K 16V 1608 K 50V 2012 K 50V 1608 Z 50V 1608 K 50V 1608 K Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Fairchild Semiconductor Resistor (SMD) 330kΩ 56kΩ 75kΩ 56kΩ 27kΩ 82kΩ 100kΩ 9.1kΩ 1kΩ 1kΩ 1kΩ 100kΩ 10kΩ 1kΩ 1kΩ 1kΩ 1kΩ 10kΩ 10kΩ 10kΩ 10kΩ 10kΩ 10kΩ 1kΩ 10kΩ Capacitor (SMD) 0.22µF 1µF 4.7nF 4.7nF Diode / TR (SMD) BAW56 BAV70 BAV70 BAV99 BAV99 BAV99 BAV99 BAW56 BAW56 KST2222 © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 11 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC 5. BOM of the Application Circuit (Continued) Part Ref. C22 M1 M2 TX1 TX2 Value 220µF Description / Vendor 25V Fairchild Semiconductor Fairchild Semiconductor Part Ref. CN1 CN2 CN3 CN4 CN5 Value 35001WR-02A 35001WR-02A 35001WR-02A 35001WR-02A 12505WR-10 Description / Vendor Electrolytic capacitor MOSFET (SMD) FDS8958A FDS8958A EFD2124 EFD2124 Wafer (SMD) Transformer (SMD) Supported by Namyang electronics (http://www.namyangelec.co.kr) © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 12 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC Mechanical Dimensions 20-SOIC Dimensions are in millimeters unless otherwise specified. Symbol A A1 B C D E e H h L N α ccc Notes: Inches Min. .093 .004 .013 .009 .496 Max. .104 .012 .020 .013 .512 Millimeters Min. 2.35 0.10 0.33 0.23 12.60 Max. 2.65 0.30 0.51 0.32 13.00 Notes .291 .299 .050 BSC .394 .010 .016 20 0° — 8° .004 .419 .029 .050 7.40 7.60 1.27 BSC 10.00 0.25 0.40 20 0° — 8° 0.10 10.65 0.75 1.27 5 2 2 3 6 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 11 6. Symbol "N" is the maximum number of terminals. E H 1 10 D A e B A1 h x 45° C SEATING PLANE –C– LEAD COPLANARITY ccc C L α 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 13 www.fairchildsemi.com FAN7311B LCD Backlight Inverter Drive IC FAIRCHILD SEMICONDUCTOR TRADEMARKS 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. ACEx™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ DOME™ EcoSPARK™ E2CMOS™ EnSigna™ FACT® FAST® FASTr™ FPS™ FRFET™ 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™ 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 Advance Information Preliminary 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, 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. 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. No Identification Needed Full Production Obsolete Not In Production Rev. I22 © 2007 Fairchild Semiconductor Corporation FAN7311B Rev. 1.0.0 14 www.fairchildsemi.com