The current-mode-controlled boost DC-DC converter is known experimentally to behave chaotically and to produce subharmonics of the clock frequency. The behavior of this system is studied in function of its input voltage and load (with a linear variation), for some values of the reference-input current Iref. This paper discusses how choice of this current has an influence on the existence on bifurcation points and on the moment of appearance of the chaotic behavior. When and how the current-mode controlled boost DC-DC converter loses synchronization (enters into a chaotic behavior) can now be predicted; one can provide stability intervals for the input voltage Vin and the load R, according to the value of Iref.