This is a simple means of calculating the required size of the input filter capacitor in a basic power supply, or calculating the peak-to-peak ripple voltage in an existing supply. It works by ...

Since the first-stage ceramic capacitors have a triangular ripple voltage, Equation 3 gives the second-stage inductor ripple current as: Using an attenuation factor of 20%, the inductor peak-to-peak ...

C = 0.7(I)/ΔE(f) where C = capacitance in farads, I = dc load current in amperes, ΔE = peak-to-peak ripple voltage, f = ripple frequency (generally 120 Hz for full-wave or 60 Hz for half-wave ...

From the ripple equations given for Fig. 2, the ripple of output voltage during off-time when only ESR- and C O -caused ripple are considered is: where ΔI is the ripple current through the output ...