PMP8740: Inductor, PQ20/20/14-1, Ferrite, 10 uH, 15 A, TH

Hi Lars,

The details about L7 construction are shown in the design guide of the PMP8740, available at the following link:

https://www.ti.com/lit/pdf/slup348

Please go to page 21 of this guide, where L7 (referred as "Ls") should be built on PQ20/20 core + bobbin, by winding 10 turns of LITZ wire (important to use multi-filar wire because of the high RMS current) made of 160 x 0.1mm strands, while the core should have N97 material. Then add an air gap of 0.77 mm to the core (which corresponds to a ue of 57). By doing that, I calculated copper loss to be 0.63W, while core loss should be 0.57W.

Regards,

Roberto