Title :
ADC-free digital-control switch-mode LED driver with high switching frequency
Author :
Jae-Hyoun Park ; Hyung-Do Yoon
Author_Institution :
Energy-Display R&D Div., Korea Electron. Technol. Inst., Seongnam, South Korea
Abstract :
A new ADC-free digital-control switch-mode LED driver with 1MHz switching frequency is presented, which is featured by digital counters, a PWM generator, and current comparators. The digital counter consists of up/down counters with a delay routine. The counter increases or decreases its binary value, depending on comparison result between the output current and the desired current. Then a PWM signal can be generated, which its pulse width is determined by multiplication of the binary value and the clock period. To prevent oscillation of the counter value owing to high frequency clock, a delay routine is added. This designed LED driver is successfully implemented through a 0.35μm 2poly-4metal high voltage process.
Keywords :
counting circuits; digital control; driver circuits; light emitting diodes; switching circuits; 2poly-4metal high voltage process; ADC-free digital-control switch-mode LED driver; PWM generator; PWM signal; binary value multiplication; clock period; current comparators; delay routine; digital counter; digital counters; frequency 1 MHz; high frequency clock; high switching frequency; size 0.35 mum; up-down counters; Clocks; Delays; Light emitting diodes; Pulse width modulation; Radiation detectors; Switches; Switching frequency; ADC-free; LED driver; digital-control;
Conference_Titel :
Consumer Electronics (ISCE 2014), The 18th IEEE International Symposium on
Conference_Location :
JeJu Island
DOI :
10.1109/ISCE.2014.6884287
