Dear Sir,The equation you are using for inductor is not right. You should use ∆I = Vin*D*D’*T/2L. Based on your spec ripple current, you can find L value. Also, you need to know what output vlotage max ripple you want. Then you can find out capacitor value with equation ∆v = ∆I*T/8*C.
Try it and let me know your result.
Ben
What is D`, i know D is duty cycle. and T is 1/Fsw.