My apologies for not updating the thread I am just very busy and trying to get it done. I am using a micro controller to generate the pwm, its an 8 bit pwm. I can incrase the duty cycle of the pwm signal 0.4t% at a time. So depending on the input voltage ill vary the pwm.

 

You need to watch how fast the current through the load is increasing or decreasing relative to where it should be (desired current flow), and adjust the PWM percent accordingly.

A fixed PWM percent will give you that overshoot/undershoot that you need to avoid.

 

Thx for the help ill post my conclusion very soon

 

OK.

For Cout:

Cout=\(\frac{Ir*D}{8*f*Vr}\)


Vr is the output peak-peak voltage ripple

Dear Sir,

i was going though your post and i realized that the formula used to calculate Cout in my text book is given as:

Cout=\(\frac{Vin*D(1-D)}{8*L*Vr*Fs^2}\)

I calculated Cout using both the formulae, but i got different ans...
Please Help

 

Dear Sir,

i was going though your post and i realized that the formula used to calculate Cout in my text book is given as:

Cout=\(\frac{Vin*D(1-D)}{8*L*Vr*Fs^2}\)

I calculated Cout using both the formulae, but i got different ans...
Please Help

The inductor is in the denominator when designing for continuous mode. The circuit discussed, in Post 3 means this design is for discontinuous mode, so the equations change a bit.

 

D = Vo/Vin
= 10/38
= 0.26315

Calculating Lmin using your formula:

Lmin = 12.28.

Hey can i know what does critical value of inductor/capacitor mean?