[SI-LIST] Output Capacitor of a switching Regulator



Hi ,

The datahseet of a  switching regulator controller from Analog devices mentiones
of an equation to determine the min value of the capacitor at the output filter.
The equation is as follows:

Cmin = (Iomax-Iomin) * 0.8 / ESRmax * di/dt. Where di/dt is through the output
inductor, Iomax and Iomin are the max and min output currents and ESRmax is the
max ESR of the output capacitor.

It states that the minimum capacitance should produce an initial dv/dt which is
equal (but opposite in sign) to the dv/dt obtained by multiplying the
di/dt in the inductor and the ESR of the capacitor:

Can this equation be appropriately used to determine the min value of the output
 capacitor?

Experts opinion will be greatly appreciated and will do good to my power supply
design.

Thanks in advance.

Anand.


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