A current mode control buck DC/DC converter is a two-pole, one zero system. The two poles are formed by an error amplifier and load, and the zero point is added by the phase compensation. The phase compensation resistor (RCMP) determines the crossover frequency (FCRS) where total loop gain of the DC/DC converter is 0db. The high value of this crossover frequency provides a good load transient response characteristic but inferior stability. Conversely, specifying a low value for the crossover frequency greatly stabilizes the characteristics, but the load transient response is impaired.