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Optoelectronics/Displays??

LED driver comes with PWM dimming capability

Posted: 22 Feb 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? PWM? LCD? lighting application?

HV9963 LED driver

Supertex has launched the HV9963 closed-loop LED driver IC with pulse width modulated (PWM) dimming capability designed to optimize LED performance and efficiency and extend LED life. The IC excels in DC/DC applications such as RGB or white LED backlighting, LCD TVs and monitors, and LED lamps for general lighting.

The HV9963 utilizes a closed-loop system to control the current going to the LED string, which is an active, real-time system that continuously monitors the LED current via sense resistors. The HV9963 includes a 1MHz transconductance amplifier with a tri-state output, which closes feedback loops in the sensing process and provides accurate current control. It can be synchronized in applications requiring multiple LED drivers to prevent the system sub-harmonic oscillations that are often associated with driving multiple driver schemes.

The HV9963 also features hiccup mode protection for both short- and open-circuit conditions, and a high PWM dimming ratio. The IC operates in a constant frequency mode for use in a variety of converter topologies such as buck, boost and SEPIC.

"The HV9963's closed-loop system enables accurate line and load control of the LED current over its entire operating range," states Ahmed Masood, VP of marketing for Supertex. "This IC also includes controls that allow PWM dimming at very low duty cycles, resulting in a contrast ratio of up to 5,000:1."

The HV9963 is available in a 16-lead SOIC package (HV9963NG-G). The part is RoHS-compliant. Samples are available from stock. Lead-time for production quantities is four to six weeks ARO. Pricing is $0.85 each for the HV9963NG-G in 1K quantities.





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