Fairchild Semiconductor’s LED Backlight Boost Switches Reduce Power Losses, Minimize Sub-Harmonic Oscillation in High-Power LED Applications

SAN JOSE, Calif.--(BUSINESS WIRE)--Designers of high-power LEDs are challenged with preventing power losses and sub-harmonic oscillations associated with inefficient discontinuous conduction mode (DCM) boost converters. Fairchild Semiconductor’s (NYSE: FCS) FAN7340 and FAN73402 single-channel boost controllers with integrated high-voltage dimming MOSFETs address these challenges by helping designers achieve greater efficiency, performance and better reliability in high-power lighting applications such as LED backlighting for 3D televisions and monitors.

These backlight driving boost switches use a current-mode control topology with programmable slope compensation to prevent sub-harmonic oscillation. Designed with an internal dimming and analog pulse-width modulation (PWM), these devices overcome the short falls of a DCM boost converter by achieving a fast PWM dimming response.

Both devices offer integrated protection features such as under-voltage lockout, open LED protection, and over-voltage protection that help to minimize component count. Additionally, these devices provide error prevention by generating a FAULT signal with delay if an abnormal LED string condition occurs.

Features and Benefits:

FAN7340: R_DS(ON)= 3.4Ω at V_GS= 10V, BV_DSS = 400V
FAN73402: R_{DS(ON) =}1.0Ω at V_GS= 10V, BV_DSS = 200V
Wide-supply voltage range: 10V to 35V
Cycle-by-cycle current limiting
Internal soft-start prevents in-rush current flowing into output capacitor at startup
Programmable switching frequency

Packaging and Pricing Information (in US 1,000 quantity pieces)

Samples available upon request - Delivery 8-12 weeks ARO

Both available in a 16-lead SOIC package the FAN7340 is priced at $0.85 and the FAN73402 is priced at $1.06

Fairchild enables engineers to drive innovation in their designs by developing solutions like the FAN7340 and FAN73402. The company offers a broad portfolio of full range power semiconductor devices that cover high-, mid-, and low-power ranges to help designers maximize energy savings in virtually every power-sensitive application.

For more information, please visit:

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

Fairchild Semiconductor: Solutions for Your Success™.

Contact Information:

To contact Fairchild Semiconductor about this product, please go to: http://www.fairchildsemi.com/cf/sales_contacts/.

For information on other products, design tools and sales contacts, please visit: http://www.fairchildsemi.com.

Note to Editor: For a datasheet in PDF format, please go to:

http://www.fairchildsemi.com/ds/FA/FAN7340.pdf
http://www.fairchildsemi.com/ds/FA/FAN73402.pdf

About Fairchild Semiconductor:

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