APPARATUS FOR SUPPLYING POWER, BACK LIGHT UNIT AND DISPLAY APPARATUS USING THE SAME

摘要

PURPOSE: A power supply device, a display unit, and a back light unit using the same are provided to improve power conversion efficiency by reducing power loss of a main switch device. CONSTITUTION: A first inductor(L1) is connected between a first node and a second node. A main switch(S1) is connected between the second node and a ground power source. The main switch is switched according to a first switching signal. A separation capacitor(Cs) is connected between the second node and a third node. A second inductor(L2) is connected between the third node and the ground power source. A first diode(D1) is connected between the third node and an output node. An anode electrode of a second diode(D2) is connected to the second node. One end of a third inductor(L3) is connected to a cathode terminal of the second diode. An auxiliary switch is switched according to a second switching device.