The input capacitor must meet the ripple current requirement (I[SUB]RMS[/SUB]) imposed by the switching currents. The I[SUB]RMS[/SUB] requirements may be determined by the following equation:
In layman's terms, what is the I[SUB]RMS[/SUB] referred to here? Is this the ripple current rating the capacitor must have for longlivity? Is this some kind of current requirement to for proper output current capability?
The capacitor you buy to use with your circuit must have a rating at least equal to the max ripple current requirement or else it will heat up too much and possibly blow out much too soon.