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PNW-PMN-PZT ceramics were fabricated with the variations of Nb2O5 addition and their microstructural and piezoelectric characteristics were investigated. When the amount of Nb2O5 increased, grain size decreased gradually. At 0.3wt% Nb2O5 which is the same weight percent with Fe2O3, maximum tetragonality(c/a) and density were shown due to the complexed doping effects. Also, this composition that showed Qm of 2,041, kp of 0.55, grain size of 2.5㎛ and εr of 1704 were proper for high power application. Using this composition, Rosen-type piezoelectric transformer was fabricated as the size of 1×16×5mm3 and its electrical characteristics were investigated with the variations of load resistance and driving frequency. At the resistance of 200㏀, maximum step-up ratio of 13.68 was shown. After driving PDA CCFL for 25 min using the inverter circuit, at driving frequency of 214.4kHz, input voltage of 31.78 V and input current of 21.1mA were measured at the input part of piezoelectric transformer. And then, output voltage of 293.2 V and output current of 2.2mA were shown at the output part of piezoelectric transformer. At the same time, efficiency of 96.2% and temperature rise of 3.6°C were appeared at the piezoelectric transformer.

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