When Se increases, then the factor that determines if sub-harmonic oscillation will occur decreases. When the duty cycle is greater than 50%, and the inductance becomes less, the factor increases. For more flexibility, slope compensation can be increased by adding one external resistor, RSL, in the ISEN's path. Figure 23 shows the setup. The externally generated slope compensation is then added to the internal slope compensation of the LM3478. When using external slope compensation, the formula for Se becomes: