V1203 is the monolithic lC designed for step-down LED driver capable of driving 1.8A-3.3A load without additional transistor.The input voltage range is up t0 60V. Its feedback voltage, VFB, is 200mV. The chip operates at a switching frequency of 52kHz. The external shutdown function is controlled by alogic level on the ON/OFF pin and then the circuit comes into the standby mode with ISTBY~50pA (typ.). The ON/OFF pin may be used for the analog dimming. As the voltage on the ON/OFF pin is increased from 0.07V to 0.67V, the voltage on the FB pin falls from 200mV t0 0. The self-protection features include a cycle-by-cycle current limit and a thermal protection. V1203 is available in standard T0-263,T0252 and PSOP-8 with power pad package.