Digital Sliding Mode Pulsed Current Averaging IC Drivers for High Brightness Light Emitting Diodes

This paper proposes a digital controller with sliding mode pulsed current averaging scheme for high-brightness (HB) light emitting diodes (LED) IC drivers. The digital controller implements a control method to adjust the ´on time´ of the active switch based on the comparison of output current and a reference current. The idea is to increase or decrease the duty cycle by discrete pulses in order to control the average current being delivered to the load. A variable frequency boost converter in discontinuous conduction mode (DCM) has been used to handle the required load current. No external analog-to-digital (A/D) converter is required for the application