LED 드라이버 설계를 위한 상용 IC의 PSPICE 모델링 기법

PC817A optocoupler and TOP245P driver IC modeling technique are proposed for the LED Driver design. For PC817A modeling, the empirical equation of PC817A CTR(current transfer ration) is fitted from the datasheet of PC817A. Analog behavioral model of TOP245P IC including the shunt regulator and PWM comparator blocks is developed by using PSPICE. The results simulated by the proposed modeling technique are in good agreement with those in the datasheet. The averaged-model and switching-model are applied to the PSPICE　 simulation.