When I design a basic power supply that uses a full wave rectifier, The smoothing capacitor is very large. The output of power supply is 5V and 1A.
The ripple voltage equation is: V = I / (f*C)
f = 100 Hz and I assume that ripple voltage are 10 % (0.5V).
The capacitor value is 20 mF. I think that's too much and the cap is not available practically. I saw many previously designed power supplies and their capacitors ranged from 470 uF to 2200 uF. What Am I missing?
Thank you very much,