Need some CCFL transformer help
5VDC is just a misprint in the catalogue. Lower down it says:


Primary Voltages: 1 x 13V
Secondary Voltages: 1 x 1.34kV


So you should give it 12-13V AC, preferably as a sine wave, and will get just over a kilovolt on the far side. Take care to keep the two secondary outputs well away from one another and well insulated.