FAN7318 LCD Backlight Inverter Drive IC Features Description The FAN7318 is a LCD backlight inverter drive IC that controls P-N half-bridge topology. High-Efficiency Single-Stage Power Conversion Wide Input Voltage Range: 6V to 30V Backlight Lamp Ballast and Soft Dimming Minimal External Components Required Precision Voltage Reference Trimmed to 2% Half-Bridge Topology Soft-Start PWM Control at Fixed Frequency Analog Dimming Function Burst Dimming Function Programmable Striking Frequency Open-Lamp Protection Open-Lamp Regulation Short-Lamp Protection CMP-High Protection FB-High Protection Thermal Shutdown 20-Pin SOIC The FAN7318 provides a low-cost solution and reduces external components by integrating proprietary wave rectifiers for open-lamp protection and regulation. The operating voltage range of the FAN7318 is wide, so an external regulator isn’t necessary to supply the voltage to the IC. The FAN7318 provides various protections, such as open-lamp regulation, open-lamp protection, short-Lamp protection, CMP-high protection, and FB-high protection, to increase the system reliability. The FAN7318 provides burst dimming and analog dimming. The FAN7318 is available in a 20-SOIC package. Applications LCD TV LCD Monitor Ordering Information Part Number FAN7318M FAN7318MX Operating Temperature -25 to +85°C Package 20-Lead, Small Outline Integrated Circuit (SOIC) Eco Status RoHS Packing Method Rail Tape & Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. Protected under U.S. patent nos. 5,652,479. © 2009 Fairchild Semiconductor Corporation FAN7318 • 1.0.0 www.fairchildsemi.com FAN7318 — LCD Backlight Inverter Drive IC March 2009 Application Device Input Voltage Range Number of Lamps 22-Inch LCD Monitor FAN7318 15V±10% 4 1. Features 11 12 OUTB 10 OUTA 13 GND 9 VIN 14 ENA 8 OLR4 15 BDIM 7 OLP4 16 BCT 6 OLP3 17 REF 5 OLP3 18 CT 4 OLR2 19 ADIM 3 OLP2 CMP 2 IC1 TIMER BDIM 1 OLP1 20 High-Efficiency Single-Stage Power Conversion P-N Half-Bridge Topology Reduces Required External Components Enhanced System Reliability through Protection Functions OLR1 Figure 63. Typical Application Circuit © 2009 Fairchild Semiconductor Corporation FAN7318 • 1.0.0 www.fairchildsemi.com 22 FAN7318 — LCD Backlight Inverter Drive IC Typical Application Circuit (LCD Backlight Inverter) FAN7318 — LCD Backlight Inverter Drive IC © 2009 Fairchild Semiconductor Corporation FAN7318 • 1.0.0 www.fairchildsemi.com 24