The present invention relates to a current sensing transformer, a method of manufacturing the same, a lamp power supply having the same, and a liquid crystal display ("LCD") having the lamp power supply, where the current sensing transformer includes a printed circuit board ("PCB") having an insulating base plate, a first winding pattern formed in a predetermined shape on a first surface of the insulating base plate of the PCB, and a second winding pattern formed in a predetermined shape on a second surface, opposite the first surface, of the insulating base plate of the PCB.