Buck converter

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If the equivalent series resistance of the capacitor in the buck converter in Example 6-2 is 0.5 ohm , recompute the output voltage ripple. (b) Recompute the required capacitance to limit the output voltage ripple to 0.5 percent if the ESR of the capacitor is given by rC 50(10)6/C, where C is in farads.

Example 6.2 Design a buck converter to produce an output voltage of 18 V across a 10- load resistor. The output voltage ripple must not exceed 0.5 percent. The dc supply is 48 V. Design for continuous inductor current. Specify the duty ratio, the switching frequency, the values of the inductor and capacitor, the peak voltage rating of each device, and the rms current in the inductor and capacitor. Assume ideal components.D=.375, L=97.5uH, C = 100uF, F=40KHz, IL = 1.8A

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