FEEDBACK CIRCUIT BETWEEN DIMMING DRIVER AND SMPS FOR LED

摘要

PURPOSE: An LED driver and a feedback circuit are provided to prevent an LED output voltage from being maximized or minimized by supplying a uniform voltage to an LED channel. CONSTITUTION: An All_PWM_OFF signal generating part(310) generates an All_PWM_OFF signal. A dimming signal apply part(320) transmits a PWM dimming signal to a plurality of LED channels. An All_PWM_OFF signal apply part transmits the All_PWM_OFF signal. A first switch(330) is connected to the All_PWM_OFF signal apply part. A second switch(340) is connected to the first switch and the dimming signal apply part. The second switch is complementarily operated with the first switch. A protection part supplies a uniform voltage to a DC/DC converter.