LED driver uses a closed-loop system

The HV9963 closed-loop LED driver IC features PWM dimming capability and includes a 1.0-MHz transconductance amplifier with a three-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 subharmonic oscillations that are often associated with driving multiple driver schemes.

The driver also features hiccup mode protection for both short- and open-circuit conditions, and a high PWM dimming ratio. Housed in a 16-lead SOIC package, the IC operates in a constant-frequency mode for use in a variety of converter topologies such as buck, boost, and SEPIC. ($0.85 ea/1,000 — prod qty, 4 to 6 weeks ARO.)

Supertex , Sunnyvale , CA
Kenneth Vickers 408-222-4810

http://www.supertex.com