Abstract: The dc-dc converter can be delivers a dc voltage or current at different level to the source, it's like a dc transformers. It also convert unregulated dc voltage into regulated dc voltage under varying load conditions and different voltage conditions. The output voltage of the converter has controlled by using the principle of negative feedback and it exhibit bifurcation and chaos if the switching action is govern by the negative feedback. There are two mode of PWM dc-dc converters they are voltage program mode and current program mode. In this paper, the chaotic behavior is observed in a positive output Elementary Luo_converter in current program mode. The need for chaos analysis is to get the desired regulated voltage and also get better dynamic response. The positive output Elementary Luo_converters has a wide range of industrial application and to control the chaotic behavior of the converter to be a special significance.