FAN7314 LCD Backlight Inverter Drive IC Features ■ High-efficiency single-stage power conversion Description ■ Wide input voltage range: 5V to 25.5V The FAN7314 provides all the control functions for use as 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 CCFL and the transformer’s characteristics. ■ Back light lamp ballast and soft dimming ■ Reduces number of required external components ■ Precision voltage reference trimmed to 2% ■ ZVS half-bridge topology ■ Soft start ■ PWM control at fixed frequency ■ Analog and burst dimming function ■ Programmable striking frequency ■ Open lamp protection ■ Open lamp regulation ■ 20-Pin SOIC Ordering Information Product number Package Operating Temperature FAN7314M 20-SOIC -25°C to 85°C FAN7314MX FPS™ is a trademark of Fairchild Semiconductor Corporation. ©2006 Fairchild Semiconductor Corporation FAN7314 Rev. 1.0.1 1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC March 2006 RT OUTA Oscillator Output Driver max. 2V OUTB CT min. 0.5V Output Control Logic – + + 6µA S_S PGND OUTC 2.65V RT1 Output Driver OUTD MRT1 Striking Logic OLP S_S 1.4µA UVLO EA_OUT + ADIM + Q Error Amp. – EA_IN Q SET CLR S – Solr max. 2V BCT min. 0.5V VOLP + OLR Solr 105µA – Sburst 85µA Va+α 2V 2.5VREF REF Voltage Reference & Internal Bias – AGND – + 1.4V VIN VIN + UVLO – 2 FAN7314 Rev. 1.0.1 ENA + Sburst BDIM OLP 2.5V 1.5V UVLO R 2.5V VOLP+α UVLO 5V www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Internal Block Diagram FAN7314 LCD Backlight Inverter Drive IC Pin Assignments RT1 OUTB OUTA VIN 20 19 18 17 PGND OUTC OUTD 16 14 15 CT RT BCT 13 12 11 9 10 FAN7314 1 2 3 4 5 6 7 8 OLP OLR ENA S_S GND REF ADIM BDIM EA_IN EA_OUT Pin Definitions Pin Number Pin Name Pin Function Description 1 OLP Open Lamp Protection 2 OLR Open Lamp Regulation 3 ENA Enable Input 4 S_S Soft Start 5 GND Analog Ground 6 REF 2.5V Reference Voltage 7 ADIM Analog Dimming Input 8 BDIM Burst Dimming Input Error Amplifier Input 9 EA_IN 10 EA_OUT 11 BCT 12 RT Timing Resistor 13 CT Timing Capacitor 14 OUTD NMOSFET Drive Output D 15 OUTC PMOSFET Drive Output C 16 PGND Power Ground 17 VIN Supply Voltage 18 OUTA PMOSFET Drive Output A 19 OUTB NMOSFET Drive Output B 20 RT1 Striking Frequency Resistor Error Amplifier Output Burst Dimming Timing Capacitor 3 FAN7314 Rev. 1.0.1 www.fairchildsemi.com For typical values TA = 25°C, VCC = 12V and for min/max values TA is the operating ambient temperature range with –25°C ≤ TA ≤ 85°C and 5V ≤ VCC ≤ 25.5V, unless otherwise specified. Symbol VCC Topr Tj Parameter Value Unit Supply Voltage 5 to 25.5 V Operating Temperature Range -25 to 85 °C 150 °C -65 to 150 °C 70 °C/W 1.8 W Junction Temperature Tstg Storage Temperature Range Thermal Resistance RθJA Pd Junction-Air(1, 2) Power Dissipation Notes: 1. Thermal resistance test board: Size: 76.2mm x 114.3mm x 1.6mm(1S0P) JEDEC standard: JESD51-2, JESD51-3 2. Assume no ambient airflow. ESD Level Parameter Pins Conditions Level Unit V Human Body Model (HBM) All pins R = 1.5kΩ, C = 100pF 2000 Machine Model (MM) All pins except for BDIM C = 200pF 300 BDIM 250 Electrical Characteristics For typical values TA = 25°C, VCC = 12V and for min/max values TA is the operating ambient temperature range with –25°C ≤ TA ≤ 85°C and 5V ≤ VCC ≤ 25.5V, unless otherwise specified. Symbol Characteristics Test Condition Min. Typ. Max. Unit – 2 25 mV 2.45 2.5 2.55 V 110.4 115 119.6 kHz REFERENCE SECTION (Recommend X7R Capacitor) ∆Vref Line Regulation V25 2.5V Regulation Voltage 5 ≤ VCC ≤ 25.5V OSCILLATOR SECTION (Main) TA = 25°C, Ct = 270pF Rt = 18k fosc Oscillation Frequency 108 115 122 Vcth CT High Voltage – 2.0 – V Vctl CT Low Voltage – 0.5 – V 204.75 225 245.25 Hz 201 225 248 Ct = 270pF, Rt = 18k OSCILLATOR SECTION (Burst) foscb Oscillation Frequency TA = 25°C, Ctb = 10nF, Rt = 18k Ctb = 10nF, Rt = 18k Vbcth BCT High Voltage – 2 – V Vbctl BCT Low Voltage – 0.5 – V 4 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Absolute Maximum Ratings Symbol Characteristics Test Condition Min. Typ. Max. Unit ERROR AMP SECTION Open Loop Gain(1) – 80 – dB Unit Gain Bandwidth(1) – 1.5 – MHz 2.13 2.4 2.57 V – – -1 mA Veh Feedback Output High Voltage EA_IN = 0V lsin Output Sink Current EA_OUT = 1.5V lsur Output Source Current EA_OUT = 1.5V 1 – – mA Iolr EA_IN Driving Current On OLR 75 105 135 µA Iburst EA_IN Driving Current On Burst Dimming 61 85 109 µA Vfbh Feedback High Voltage On Burst Dimming Va + 0.1 Va + 0.4 Va + 0.7 V 4 6 8 µA 2.3 2.65 3 V R(EA_IN) = 60kΩ SOFT START SECTION ISS Vssh Soft Start Current S_S = 2V Soft Start Clamping Voltage 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 2.25 V Iolp Open Lamp Protection Charging Current 0.7 1.4 2.1 µA UNDER VOLTAGE LOCK OUT SECTION Vth Start Threshold Voltage – – 5 V Ist Start Up Current VCC = Vth–0.2 – 130 180 µA Iop Operating Supply Current VCC = 12V – 1.5 4 mA Isb Stand-by Current VCC = 12V – 200 370 µA ON/OFF SECTION Von On State Input Voltage 2 – 5 V Voff Off Stage Input Voltage – – 0.7 V – Vcc OUTPUT SECTION Vpdhv PMOS Gate High Voltage VCC = 12V Vphlv PMOS Gate Low Voltage VCC = 12V Vndhv NMOS Gate Drive Voltage VCC = 12V 6.5 Vndhv NMOS Gate Drive Voltage VCC = 12V Vpuv PMOS Gate Voltage With UVLO Activated Vnuv – V Vcc–6.5 V 8.5 10.5 V – 0 – V VCC = Vth–0.2 Vcc–0.3 – – V NMOS Gate Voltage With UVLO Activated VCC = Vth–0.2 – – 0.3 V Tr Rising Time(1) VCC = 12V, Cload = 2nF – 200 500 ns Tf Falling Time(1) VCC = 12V, Cload = 2nF – 200 500 ns 5 FAN7314 Rev. 1.0.1 Vcc–10.5 Vcc–8.5 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Electrical Characteristics (Continued) For typical values TA = 25°C, VCC = 12V and for min/max values TA is the operating ambient temperature range with –25°C ≤ TA ≤ 85°C and 5V ≤ VCC ≤ 25.5V, unless otherwise specified. Characteristics Test Condition Min. Typ. Max. Unit MAX./MIN. OVERLAP Min. Overlap Between Diagonal Switches(1) fosc = 100kHz – 0 – % Max. Overlap Between Diagonal Switches(1) fosc = 100kHz – 100 – % PDR_A/NDR_B(1) Rt = 18k – 450 – ns PDR_C/NDR_D(1) Rt = 18k – 450 – ns DELAY TIME Notes: 1. These parameters, although guranteed, are not 100% tesed in production. 2. Specifications to -25°C to 85°C are guaranteed by design based on final characterization results. 6 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Symbol UVLO: The under voltage lockout circuit guarantees stable operation of the IC’s control circuit by stopping and starting operation 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 the operation of the IC. Applying voltage lower than 0.7V to the ENA pin will disable the 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 value connected to the S_S pin determines the rate at which the duty ratio rises. It is charged by a 6µA current source. 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 below: 3.75 f burst = ----------------------------------96 R T BC T 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. The current source is formed by the timing resistor (RT). The timing resistor’s voltage is regulated at 1.25V. The sawtooth waveform (see top of next column) 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: By comparing the input of BDIM pin with the 0.5 to 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. 19 f op = ------------------------------32 R T C T 7 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Function Description FAN7314 LCD Backlight Inverter Drive IC Open lamp regulation & 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 shut down where all the output is high. 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 will drive the other half-bridge. 8 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Timing Diagram The FAN7314 uses the half-bridge to drive CCFL. EA_OUT CT SYNC T POUT A NOUT B POUT C NOUT D 9 FAN7314 Rev. 1.0.1 www.fairchildsemi.com Application Lamps Input Voltage 19 inch LCD Monitor 4 13V 1. Schematic F1 FUSE C22 22 0u C25 1u 25V CN5 C27 1u C26 0.1u 1 2 3 4 5 6 7 8 9 10 IC1 0 FAN7314 0 13V 0 M1 0 R6 82k ON/OFF OLP RT1 OLR OUTB R25 ENA 10k 12505WR-10 0 0 S_S 0 GND PGND REF OUTC ADIM OUTD R2 56k R3 18k EA_IN RT 0 1 CN1 CCFL SN DN GN DN SP DP GP 0 BCT DP CN2 CCFL COLD C11 15p OLP1 FDS8958A 4.7n D4 BAV70 OLR R26 1k RT C14 10n R13 1k OLP2 D6 BAV99 C30 10n D7 BAV99 R17 1k 100k 0 10k 0 R9 9.1k 0 0 0 0 0 1 0 OLP1 2 OLP2 R22 10k 0 CN4 CCFL 0 C12 15p 2 C13 15p Q1 KST2222 COLD OLP3 OLP3 D1 BAW56 R20 10k OLP4 R21 10k C19 2.2n 0 0 OLR D3 BAV70 R12 1k C18 2.2n OLP4 C20 2.2n D10 BAW56 0 COLD HOT R23 10k D11 BAW56 0 HOT CN3 CCFL R14 100k 1 C9 1u 0 FB TX2 OLR R1 330k R16 1k R15 FB OLP COLD HOT 2 C10 15p 10k 0 C4 R8 REF HOT 2 0 R27 0 4.7n 0 LTM190EX 1 0 C3 EA_OUT DP FDS8958A M2 R5 27k C21 10n GP TX1 J1 0 C5 220p CT DP C8 10u 0 R7 0 BDIM DN SP C7 10u 0 VIN 1u 0 DN GN 10k C2 1u REF DIM (0~3.3V ) C6 0 SN OUTA OUTA C1 0.22u C28 10n R4 22k 0 RT OUTB R24 0 C17 2.2n C29 10n 0 0 R11 1k 0 D8 BAV99 C15 10n 0 0 D9 BAV99 R18 1k 0 0 R19 1k 0 FB 2. Transformer Schematic Diagram Supported by Namyang electronics (http://www.namyangelec.co.kr) 1 9 6 7 9 8 7 6 5 4 3 2 1 3. Core & Bobbin ■ Core: EFD2124 ■ Material: PL7 ■ Bobbin: EFE2124 10 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC Typical Application Circuit Pin No. Wire Turns Inductance 5→2 7→9 Leakage Inductance Remarks 1 UEW 0.45 φ 12 1 UEW 0.04 φ 2430 (270 x 9) 180µH 7.2µH 1KHz, 1V 7.2H 330mH 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 220p 50V 1608 J C6 1µ 50V 2012 K C7 10µ 16V 3216 R1 330K 1608 J C8 10µ 16V 3216 R2 56K 1608 F C9 1µ 16V 1608 K R3 18K 1608 F C10 15p 3KV 3216 R4 22K 1608 F C11 15p 3KV 3216 R5 27K 1608 F C12 15p 3KV 3216 R6 82K 1608 F C13 15p 3KV 3216 R8 100K 1608 F C14 10n 50V 1608 K R9 9.1K 1608 F C15 10n 50V 1608 K R11 1K 1608 F C17 2.2n 50V 1608 Z R12 1K 1608 F C18 2.2n 50V 1608 Z R13 1K 1608 F C19 2.2n 50V 1608 Z R14 100K 1608 F C20 2.2n 50V 1608 Z R15 10K 1608 F C21 10n 50V 1608 Z R16 1K 1608 F C25 1µ 50V 2012 K R17 1K 1608 F C26 0.1µ 16V 1608 K R18 1K 1608 F C27 1µ 50V 2012 K R19 1K 1608 F C28 10n 50V 1608 Z R20 10K 1608 J C29 10n 50V 1608 K R21 10K 1608 J C30 10n 50V 1608 K R22 10K 1608 J R23 10K 1608 J D1 BAW56 Fairchildsemi R24 10K 1608 J D3 BAV70 Fairchildsemi R25 10K 1608 J D4 BAV70 Fairchildsemi R26 1K 1608 F D6 BAV99 Fairchildsemi 10K 1608 J R27 Diode / TR (SMD) Capacitor (SMD) D7 BAV99 Fairchildsemi D8 BAV99 Fairchildsemi C1 0.22µ 16V 1608 K D9 BAV99 Fairchildsemi C2 1µ 50V 2012 K D10 BAW56 Fairchildsemi C3 4.7n 50V 1608 K D11 BAW56 Fairchildsemi C4 4.7n 50V 1608 K Q1 KST2222 Fairchildsemi 11 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC 4. Winding Specification Part Ref. Value Description/Vendor Part Ref. Electrolytic capacitor C22 220µ Value Wafer (SMD) 25V MOSFET (SMD) CN1 35001WR-02A CN2 35001WR-02A M1 FDS8958A Fairchildsemi CN3 35001WR-02A M2 FDS8958A Fairchildsemi CN4 35001WR-02A CN5 12505WR-10 TX1 EFD2124 TX2 EFD2124 Transformer (SMD) Supported by Namyang electronics (http://www.namyangelec.co.kr) 12 FAN7314 Rev. 1.0.1 Description/Vendor www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC 5. BOM of the Application Circuit (Continued) 20-pin SOIC Package 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 B SEATING PLANE –C– ccc C 13 FAN7314 Rev. 1.0.1 α LEAD COPLANARITY L www.fairchildsemi.com FAN7314 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. ACEx™ FAST® ActiveArray™ FASTr™ Bottomless™ FPS™ Build it Now™ FRFET™ CoolFET™ GlobalOptoisolator™ CROSSVOLT™ GTO™ DOME™ HiSeC™ EcoSPARK™ I2C™ E2CMOS™ i-Lo™ EnSigna™ ImpliedDisconnect™ FACT™ IntelliMAX™ FACT Quiet Series™ Across the board. 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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 in order 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 in order 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. I18 14 FAN7314 Rev. 1.0.1 www.fairchildsemi.com FAN7314 LCD Backlight Inverter Drive IC TRADEMARKS