Supertex Inc., a manufacturer of high voltage analog and mixed signal ICs, introduces the HV9963, a 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 uses 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 1.0 MHz 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 is available in a 16-lead SOIC package (HV9963NG-G) and is RoHS compliant. Samples are available from stock.
For more information, contact Supertex Inc., 1235 Bordeaux Dr., Sunnyvale, CA 94089. Phone: (408) 222-8888.