The LM5143-Q1 provides internal slope compensation for stable operation with peak current-mode control and a duty cycle greater than 50%. Use Equation 10 to calculate the buck inductance to provide a slope compensation contribution equal to one times the inductor downslope.

Equation 10.

• A lower inductance value generally increases the peak-to-peak inductor current, which minimizes size and cost, and improves transient response at the cost of reduced light-load efficiency due to higher cores losses and peak currents.
• A higher inductance value generally decreases the peak-to-peak inductor current, which increases the full-load efficiency by reducing switch peak and RMS currents at the cost of requiring larger output capacitors to meet load-transient specifications.