hi...
i want make a buck boost converter but i need to circuit and equations for components(inductor and capacitor)...
so..my_data:
input_voltage:10.6 until 12.5
output_voltage:12
output_current:30A
Fsw=50KHz
can you help me??

 

If you want to use TI's chips, they have a really nice calculator.

http://www.ti.com/lsds/ti/analog/we...ntr_en&HQS=sva-web-webdesigncntr-vanity-lp-en

 

tnx...but ti.com is access Denied

 

Try this one

http://www.ti.com/lsds/ti/analog/webench/overview.page

or search for webench in google.