DIGITAL DIMMING DRIVING CIRCUIT FOR LED

摘要

PURPOSE: A digital dimming LED(Light Emitting Diode) driver circuit is provided to easily secure the idle time of a MCU(Micro Controller Unit) by reducing a control loop frequency. CONSTITUTION: A light source part(30) comprises a red, a green, and a blue LED array. A SMPS(Switching Mode Power Supply) part(20) comprises a DC-DC transform part for the red, the green, and the blue LED. The DC-DC transform part converts external DC power into DC power for driving the LED arrays. A control board part(40) supplies a control loop frequency and a PWM frequency in order to control a current flowing into the LED arrays.