Designers of high-power LEDs face the challenge of minimizing power loss and sub-harmonic oscillation caused by inefficient discontinuous conduction mode (DCM) boost converters. Fairchild Semiconductor (NYSE: FCS)’s FAN7340 and FAN73402 single-channel boost controllers, which integrate high-voltage dimming MOSFETs, address this challenge by enabling high efficiency, performance, and reliability when designing high-power lighting applications, such as LED backlighting used in 3D televisions and monitors.

These backlight drive boost switch products utilize a current mode control topology with programmable slope correction to prevent intermittent oscillation. By integrating internal dimming and analog pulse-width modulation (PWM) functions, these devices achieve a fast PWM dimming response, thereby overcoming the limitations of DCM boost converters.

These device products can minimize the number of required components by integrating protection functions such as low voltage lockout, open LED protection, and overvoltage protection. In addition, these device products prevent errors by generating a FAULT signal and providing a delay time when abnormal LED string conditions occur.

Product Features and Benefits:

• FAN7340: RDS(ON) = 3.4Ω (VGS = 10V, BVDSS = 400V)
• FAN73402: RDS(ON) = 1.0Ω (VGS = 10V, BVDSS = 200V)
• Wide power voltage range: 10V~35V
• Cycle-by-cycle current limit
• By integrating a soft start function, inflow current to the output capacitor is prevented during startup.
• Switching frequency programmable
Packaging and Price (Price per unit for a quantity of 1,000)
Sample orders are currently available – delivery is 8–12 weeks after order is received.
• Both device products are available in a 16-lead SOIC package, and the price is $0.85 for FAN7340 and $1.06 for FAN73402.
Fairchild Semiconductor is helping engineers design innovative designs by providing device solutions such as the FAN7340 and FAN73402. Fairchild Semiconductor provides a comprehensive range of power semiconductor devices covering high, medium, and low power, enabling designers to maximize energy savings for almost all types of applications sensitive to power consumption.
More details can be found at the following site:
http://www.fairchildsemi.com/applications/consumer/tv-and-monitor/led-tv-and-monitor-led-blu.html
http://www.fairchildsemi.com/applications/lighting/led-lighting/high-power.html

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Datasheet in PDF format:
/FAN7340.pdf" target=_blank>http://www.fairchildsemi.com/ds/FA/FAN7340.pdf
http://www.fairchildsemi.com/ds/FA/FAN73402.pdf