FIXATION POWER CONTROL CIRCUIT AND LED DRIVING CIRCUIT USING THE SAME

摘要

PURPOSE: A fixed power control circuit and an LED driving circuit using the same are provided to secure operation security by suppressing the variation of LED driving power due to the impedance variation of an LED lamp. CONSTITUTION: A rectifier circuit(110) changes AC to DC. A PFC(Power Factor Correction) circuit(120) corrects a power factor by controlling the phase of DC voltage outputted from the rectifier circuit. An SMPS(Switching Mode Power Supply) fixed power control circuit(130) automatically controls the current required for an LED lamp(150) within the limited power. A current balancing circuit(140) constantly supplies the current received from the SMPS fixed power control circuit to the LED lamp.