FAN7317B LCD Backlight Inverter Drive IC Features Description The FAN7317B is a LCD backlight inverter drive IC that controls P-N full-bridge topology using a new propriety phase-shift method. High-Efficiency, Single-Stage Power Conversion Wide Input Voltage Range: 6V to 28V Backlight Lamp Ballast and Soft Dimming Minimal Required External Components Precision Voltage Reference Trimmed to 2% ZVS Full-Bridge Topology Soft-Start PWM Control at Fixed Frequency Burst Dimming Function Dynamic Contrast Ratio Function Programmable Striking Frequency Open-Lamp Protection (OLP) Open-Lamp Regulation (OLR) Short-Lamp Protection (SLP) Thermal Shutdown (TSD) 20-Pin SOIC The FAN7317B provides a low-cost solution and reduces external components by integrating full wave rectifiers for open-lamp protection and regulation (patent pending). The operating voltage range of the FAN7317B is wide, so an external regulator isn’t necessary to supply the voltage to the IC. The FAN7317B provides protections such as open-lamp regulation, open-lamp protection, and short-lamp protection to increase the system reliability. The FAN7317B provides a burst-dimming function and analog dimming is possible, in a narrow range, by adding external components. The FAN7317B is available in a 20-pin SOIC package. Applications LCD TV LCD Monitor Ordering Information Part Number FAN7317BM FAN7317BMX Operating Temperature Package -25 to +85°C 20-Pin Small Outline Integrated Circuit (SOIC) © 2009 Fairchild Semiconductor Corporation FAN7317B • 1.0.2 Packing Method Rail Tape and Reel www.fairchildsemi.com FAN7317B — LCD Backlight Inverter Drive IC April 2011 Application Device Input Voltage Range Number of Lamps 22-Inch LCD Monitor FAN7317B 13±10% 4 1. Features 20 19 18 17 16 15 14 13 12 11 CT CMP ENA OLP4 OLR4 OLP3 OLR3 VIN OUTD OUTC REF BDIM BCT OLP1 OLR1 OLP2 OLR2 GND OUTB OUTA 3 4 5 6 7 8 9 10 BDIM(0~3.3V) IC1 ON/OFF 2 High-Efficiency Single-Stage Power Conversion P-N Full-Bridge Topology Reduces Required External Components Enhanced System Reliability through Protection Functions 1 Figure 55. Typical Application Circuit 2. Transformer Schematic Diagram Figure 56. Transformer Schematic Diagram 3. Core & Bobbin Core: EFD2126 Material: PL7 Bobbin: EFD2126 © 2009 Fairchild Semiconductor Corporation FAN7317B • 1.0.2 www.fairchildsemi.com 19 FAN7317B — LCD Backlight Inverter Drive IC Typical Application Circuit (LCD Backlight Inverter) 13.00 12.60 A 11.43 20 11 B 9.50 10.65 7.60 10.00 7.40 2.25 1 0.51 0.35 PIN ONE INDICATOR 1.27 0.25 M 10 0.65 1.27 C B A LAND PATTERN RECOMMENDATION 2.65 MAX SEE DETAIL A 0.33 0.20 C 0.75 0.25 X 45° SEATING PLANE NOTES: UNLESS OTHERWISE SPECIFIED (R0.10) GAGE PLANE (R0.10) 0.10 C 0.30 0.10 0.25 8° 0° 1.27 0.40 SEATING PLANE (1.40) DETAIL A A) THIS PACKAGE CONFORMS TO JEDEC MS-013, VARIATION AC, ISSUE E B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) CONFORMS TO ASME Y14.5M-1994 E) LANDPATTERN STANDARD: SOIC127P1030X265-20L F) DRAWING FILENAME: MKT-M20BREV3 SCALE: 2:1 Figure 57. 20-Pin, Small Outline Integrated Circuit (SOIC) 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/. © 2009 Fairchild Semiconductor Corporation FAN7317B • 1.0.2 www.fairchildsemi.com 21 FAN7317B — LCD Backlight Inverter Drive IC Physical Dimensions FAN7317B — LCD Backlight Inverter Drive IC © 2009 Fairchild Semiconductor Corporation FAN7317B • 1.0.2 www.fairchildsemi.com 22