High-efficiency constant-current LED driver targets automotive lighting applications

Aimed at applications such as automotive day time running lights and LED headlamps, the high-efficiency STMicroelectronics L99LD01 constant-current LED driver is now stocked by Mouser. Manufactured with BCD5S 70V technology and assembled in a LQFP32 package, the L99LD01 is designed to be used in boost, buck-boost and fly-back converter topologies. An internal random dither oscillator works in low frequency modulation, allowing the RF spectrum of the switching frequency to spread so to reduce EMC emissions. The slope compensation ensures good converter loop stability whatever is the duty cycle needed by the application. The converter is able to work either in full power mode or in low frequency dimming mode. The device includes an internal low drop voltage regulator, that can be used to supply a microcontroller, and a reset pin, that is useful for resetting the microcontroller at the start up and every time that the regulated output voltage falls down below an established voltage threshold.