The question says to select the best answer, it doesn't imply that your calculation will exactly match one of the answers. I'd select 44uF, given that 25uF is the absolute minimum requirement.

 

The question says to select the best answer, it doesn't imply that your calculation will exactly match one of the answers. I'd select 44uF, given that 25uF is the absolute minimum requirement.

answer B is incorrect

 

Hmm ,

ΔVo = Vo * 0.005 = 90mV

In boost converter capacitor is discharge during ton time by load current.

I = C* dV/dt ---> C = (Io * ton) /ΔVo

And ton = D / F so we end up withe this equation

C= (Io*D)/ ( F * ΔVo ) = 52uF



And form witch book you have this questions ?

 

Have a look of boost capacitor calculations from texsas intrument you will find the details...!!!

Cout (min) = (Iout (max) x D)/(fs x deltaVout)

DeltaV out =( ESR* Ioutmax/(1-D)+DeltaL/2))

 

Hello,

The hint is that delta Vo is given in the problem specification.
They dont give ESR so they probably dont want you to use that.