Semi-shielded power inductors target DC/DC designs

June 19, 2014 // By Graham Prophet
This power inductor family includes enhanced magnetic shielding in a miniature-sized, cost-effective solution.

Bourns' semi-shielded SRN model series combines the features of non-shielded and shielded inductors, suiting for use in DC/DC converters and industrial applications such as LED lighting, control circuits and GPS equipment.

The series includes models SRN2010, SRN2012, SRN2510, SRN2512, SRN4012, SRN4026, SRN5040 and SRN6028, spanning 0.24 to 220 μH. The series also features high-rated current with Irms up to 4.7A and Isat up to 8A.

Bourns designed its new power inductor family using semi-magnetic shielding technology instead of the conventional ferrite shield. Preventing uncontrolled magnetic coupling of the windings, the shielding compound is applied to the perimeter of the inductor, which envelops the winding, resulting in enhanced magnetic shielding and lower radiation emissions compared to non-shielded inductors; these power inductors have a greatly reduced footprint and are more cost-effective compared to competitively-sized conventional ferrite shield inductors. Pricing is from $0.12 in (25,000).