Fairchild Semiconductor's LED Backlight Boost Switches Reduce Power Losses, Minimize Sub-Harmonic Os

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

Integrated High-Voltage Dimming MOSFETs Provide Fast Dimming Response, Better Efficiency and Reliability

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 (NYS: 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: RDS(ON) = 3.4Ω at VGS = 10V, BVDSS = 400V

  • FAN73402: RDS(ON) = 1.0Ω at VGS = 10V, BVDSS = 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.

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Contact Information:

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


About Fairchild Semiconductor:

Fairchild Semiconductor (NYS: FCS) - global presence, local support, smart ideas. Fairchild delivers energy-efficient, easy-to-use and value-added semiconductor solutions for power and mobile designs. We help our customers differentiate their products and solve difficult technical challenges with our expertise in power and signal path products. Please contact us on the web at http://www.fairchildsemi.com.

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Fairchild Semiconductor:
Paul R. Hughes, 800-341-0392 X 3110
Public Relations Manager
E-mail: paul.hughes@fairchildsemi.com
Malorie Pastor, 800-341-0392 X 3362
Public Relations Coordinator

KEYWORDS: United States North America California


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