Power-efficient CISPR25 class-3 compliant LED driver with Dynamic Headroom Control for automotive headlights

摘要

Today automotive headlights are using high current Light Emitting Diodes (LEDs). LED drivers are necessary to provide the appropriate voltage out of the car battery. Recent microcontroller-based solutions are costly and power hungry. This paper presents a power-efficient LED driver. The design is CISPR25 class-3 EMI compliant and supports ISO 7637-2 and ISO 16750-2 standards. In addition, the system includes a special feature of Dynamic Headroom Control (DHC) that aims at maximizing overall system efficiency by adjusting voltage at the boost controller by sensing the LEDs voltages. Experimental results show up to 88% power-efficiency.