The LM708x0-Q1
provides internal slope compensation for stable operation with peak current-mode
control and a duty cycle greater than 50%. Calculate the buck inductance to provide
a slope compensation contribution equal to one times the inductor downslope using
Equation 8.
Equation 8.
- A lower inductance value increases the
peak-to-peak inductor current, which typically 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 decreases the
peak-to-peak inductor current, which typically 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.