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inductor for buck converter

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i have toroidal inductor and i want to use it in dc-dc buck converter but i don't know its value , how to measure it ?
what would happen if i use this coil schaffner RB series 3 mhhttps://sa.rsdelivers.com/product/schaffner/rb8522-16-3m0/common-mode-choke-1-phase-16a-30mh/7690578.aspx in 17-9 volt buck converter 55 watt ? will it be ok or should i use smaller inductance ? also could i use any type of inductors or just toroidal coil ferrite core?
how to calculate the inductance needed for buck converter?
 

This is a common mode choke. It's not suited as storage inductor. It can only carry the rated current without saturation, if both windings have opposite current direction.
 

FvM said:
This is a common mode choke. It's not suited as storage inductor. It can only carry the rated current without saturation, if both windings have opposite current direction.
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do you mean it can't be used for this application ? if so would you propose another inductor?
 

inductor of buck converter

how to select the inductor of buck converter and how to calculate its value?
 

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