FAN7310G

FAN7310 — LCD Backlight Inverter Drive Integrated Circuit May 2007 FAN7310 LCD Backlight Inverter Drive Integrated Circuit Features High-Efficiency, Single-Stage Power Conversion Wide Input Voltage Range: 5V to 24V Backlight Lamp Ballast and Soft Dimming Reduce External Components Precision Voltage Reference Trimmed to 2% ZVS full-bridge topology Soft-Start Feature PWM Control at Fixed Frequency Analog and Burst Dimming Function Synchronizable Switching Frequency with External Signal Open-Lamp Protection Open-Lamp Regulation 20-Pin SSOP Description The FAN7310 provides all the control functions for a series parallel resonant converter and contains 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. The FAN7310 has a patent-pending on phase-shift control. 20-SSOP Applications LCD TV LCD Monitor Ordering Information Part Number FAN7310G FAN7310GX Package 20-SSOP 20-SSOP Pb-Free Yes Yes Operating Temperature Range -25°C ~ 85°C Packing Method Rail Tape & Reel © 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3 www.fairchildsemi.com FAN7310 — LCD Backlight Inverter Drive Integrated Circuit Typical Application VCC C25 100µF 0 ENA R24 10kΩ C28 10nF 0 REF R2 R4 56kΩ 22kΩ DIM(0~3.3V) C21 10nF 0 R3 20kΩ 0 C3 4.7nF 0 0 IC1 FAN7310 OLP OLR ENA S_S GND REF ADIM BDIM EA_IN RT1 OUTB OUTA VIN PGND OUTC OUTD CT RT R6 100kΩ OUTB OUTA C6 1µF 0 0 C27 1µF 0 R25 10kΩ 0 R26 10kΩ C22 1µF 0 C1 1µF M1 FDS8958A M2 FDS8958A C7 10µF TX1 REF 0 C2 1µF(X7R) OUTC OUTD C5 220pF R5 27kΩ C4 4.7nF 0 0 0 0 0 C10 15pF OLP1 CCFL EA_OUT BCT 0 OLR FB D4 BAV99 FB C14 20nF 0 0 R8 100kΩ R15 R9 2kΩ 8.2kΩ 0 D6 BAV99 0 R16 1.5kΩ 0 OLR OLP1 OLP R1 330kΩ R22 10kΩ R14 C16 100kΩ 2.2nF 0 0 C9 1µF Q1 D11 KST2222 D1N4148 C19 2.2nF D1 0 D1N4148 0 FAN7310 Rev. 05 Figure 1. Application Circuit for CCFL Internal Block Diagram RT max. 2V min. 0.5V S_S SYNC OSCILLATOR Output Driver OUTB CT + + Output Control Logic Output Driver OUTD PGND OUTC OUTA EA_OUT 6μA S_S ADIM EA_IN Error Amp. + + UVLO Q SET 1.4μA + S OLP 2V 2.7V Q CLR R UVLO + 2V REF OLR Solr 105μA Solr Sburst 85μA max. 2V min. 0.5V BCT BDIM AGND Sburst + UVLO Voltage Reference & Internal Bias 2.5VREF + - ENA 1.4V VIN VIN + - UVLO 5V FAN7310 Rev.03 Figure 2. Functional Block Diagram © 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3 2 www.fairchildsemi.com FAN7310— LCD Backlight Inverter Drive Integrated Circuit TRADEMARKS The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. 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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, and (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 a significant injury of the user. 2. A critical component in 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; 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. Rev. I28 No Identification Needed Full Production Obsolete Not In Production © 2005 Fairchild Semiconductor Corporation FAN7310 Rev. 1.0.3 www.fairchildsemi.com 11