Project 3

GIVEN DATA

Vin = 48V

Vout = 12V

swirching frequency = 20KHz

Duty cycle = Vout/Vin*efficiency.

Efficiency is taken is 0.9%

so 12/48*0.9 = 27% = D 

load resisitor = output voltage /load current  = 12/10 = 1.2ohm

Ripple current = 0.3 * Iout = 0.3 * 10 = 3A

switching frequency = 20KHz

L = Vout* (Vin-Vout)/rripple current * switching frquency*Vin

  = 12*(48-12)/3*20*10^3*48

  = 0.3*10^-3 H

C = ripple current/8*switching frequency*del Vout

delVout = ESR*ripple current

            = 0.09 * 3

            = 0.27V

c = 3/8*20*10^3*0.27

   = 70*10^-6 f