COMPLEX DIMMING CIRCUIT

摘要

PURPOSE: A complex dimming circuit is provided to minimize a delay of an output voltage in a feedback voltage and an operational amplifier by controlling a feedback voltage in the case of burst dimming. CONSTITUTION: A complex dimming circuit comprises an operational amplifying part(OP) for receiving a feedback voltage(Vfb) of a feedback part connected to a lamp to a inverting terminal(-) and outputting a comparative signal(Vcomp) about an inputted signal state from each terminal by inputting a standard voltage(Vb) of a standard voltage supplying part to a non-inverting terminal(+), a feedback signal controlling part(11,13,15) connected to the feedback part and controlling an inputted feedback signal to the inverting terminal of the operational amplifying part and making above the standard voltage in the feedback voltage for achieving an analog dimming, and a signal applying part(20) for instructing a controlling motion point in a time of the feedback signal controlling part by connecting between the feedback signal controlling part and the feedback part and outputting a burst dimming signal(Vsb) instructing a burst dimming on/off motion.