march 2009 ? 2009 fairchild semiconductor corporation www.fairchildsemi.com FAN7318 ? 1.0.0 FAN7318 ? lcd backlight inverter drive ic FAN7318 lcd backlight inverter drive ic features ? 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 applications ? lcd tv ? lcd monitor description the FAN7318 is a lcd backlight inverter drive ic that controls p-n half-bridge topology. 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-la mp protection, short-lamp protection, cmp-high protecti on, 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. ordering information part number operating temperature package eco status packing method FAN7318m rail FAN7318mx -25 to +85c 20-lead, small outline integrated circuit (soic) rohs 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 www.fairchildsemi.com FAN7318 ? 1.0.0 22 FAN7318 ? lcd backlight inverter drive ic typical application circuit (lcd backlight inverter) application device input voltage range number of lamps 22-inch lcd monitor FAN7318 15v 10% 4 1. features ? high-efficiency single- stage power conversion ? p-n half-bridge topology ? reduces required external components ? enhanced system reliability through protection functions 1timer cmp adim ct olr2 olp1 olr1 olp2 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ref bct bdim ena gnd outb olp3 olp3 olp4 olr4 vin outa bdim ic1 figure 63. typical application circuit
? 2009 fairchild semiconductor corporation www.fairchildsemi.com FAN7318 ? 1.0.0 24 FAN7318 ? lcd backlight inverter drive ic
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