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| FAN7317 -- LCD Backlight Inverter Drive IC January 2008 FAN7317 LCD Backlight Inverter Drive IC Features High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 6V to 24V 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 Programmable Striking Frequency Open-Lamp Protection Open-Lamp Regulation Arc Protection Short-Lamp Protection CMP-High Protection High-FB Protection Thermal Shutdown 20-Pin SOIC Description The FAN7317 is a LCD backlight inverter drive IC that controls P-N full-bridge topology by using the new patented phase-shift method. The FAN7317 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 FAN7317 is wide, so an external regulator isn't necessary to supply the voltage to the IC. The FAN7317 provides various protections, such as open-lamp regulation, open-lamp protection, arc protection, short-lamp protection, CMP-high protection, and FB-high protection, to increase the system reliability. The FAN7317 provides burst dimming function and analog dimming is possible, in a narrow range, by adding some external components. The FAN7317 is available in a 20-SOIC package. Applications LCD TV LCD Monitor Ordering Information Part Number FAN7317M FAN7317MX Package 20-SOIC 20-SOIC Operating Temperature -25 to +85C -25 to +85C Packing Method RAIL TAPE & REEL All packages are lead free per JEDEC: J-STD-020B standard. Protected under U.S. patent nos. 5,652,479 and 7,158,390. (c) 2007 Fairchild Semiconductor Corporation FAN7317 * 1.0.2 www.fairchildsemi.com FAN7317 -- LCD Backlight Inverter Drive IC Typical Application Circuit (LCD Backlight Inverter) Application 22-Inch LCD Monitor Device FAN7317 Input Voltage Range 1310% Number of lamps 4 1. Features High-Efficiency Single-Stage Power Conversion P-N Full-Bridge Topology Reduces Required External Components Enhanced System Reliability through Protection Functions 20 19 18 17 16 15 14 13 12 OUTD OUTB 9 VIN OLP1 BDIM REF BCT Figure 56. Typical Application Circuit 2. Transformer Schematic Diagram Figure 57. Transformer Schematic Diagram 3. Core & Bobbin Core: EFD2126 Material: PL7 Bobbin: EFD2126 (c) 2007 Fairchild Semiconductor Corporation FAN7317 * 1.0.2 www.fairchildsemi.com 20 10 1 2 3 4 5 6 7 8 OUTA OLR1 OLR2 OLP2 GND IC1 OUTC CMP ENA CT OLR4 OLP3 OLR3 OLP4 11 ON/OFF BDIM(0~3.3V) FAN7317 -- LCD Backlight Inverter Drive IC (c) 2007 Fairchild Semiconductor Corporation FAN7317 * 1.0.2 www.fairchildsemi.com 23 |
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