Conventional electronic ballasts for fluorescent lamps are designed on the basis of specific operating conditions. In order to solve this problem, a design method utilizing consecutive orthogonal arrays is proposed for robustly designing electronic ballasts of fluorescent lamps. In this manipulation, component values of the electronic ballast circuit to be determined and the DC-link voltage are used as controllable variables for inner orthogonal arrays, while the lamp type, the ambient temperature, used hours, and the variation in the DC-link voltage are treated as uncontrollable variables for outer orthogonal arrays. The average effects of the output power for each controllable variable level are obtained from simulated and experimental results, which are served as indexes to find the combination of circuit parameters with a better solution. Designed with consecutive orthogonal arrays, the electronic ballasts can be used to approach the best circuit parameter without any feedback circuit. Therefore, such a design with no need of additional circuits will not increase the cost of the electronic ballasts, and can further improve the unstable feature that conventional electronic ballasts have.