Multi-turn inductors
A multi-winding inductor includes a first foil winding and a second foil winding. One end of the first foil winding extends from a first side of the core and wraps under the core to form a solder tab under the core. One end of the second foil winding extends from a second side of the core and wraps under the core to form another solder tab under the core. Respective portions of each solder tab are laterally adjacent under the magnetic core. A coupled inductor includes a magnetic core including a first and a second end magnetic element and a plurality of connecting magnetic elements disposed between and connecting the first and second end magnetic elements. A respective first and second single turn foil winding is wound at least partially around each connecting magnetic element. Each foil winding has two ends forming respective solder tabs.
1. A multi-turn inductor, comprising:
a magnetic core having a first side opposite a second side; and
a multi-turn foil winding, including:
a first and a second foil portion each passing through the magnetic core from the first side to the second side, a first end of the first foil portion extending from the second side of the core to form a first solder tab suitable for surface mount soldering to a printed circuit board, and
a first foil interconnect disposed on the core, and wrapping under the core, to electrically connect a second end of the first foil portion extending from the first side of the core to a first end of the second foil portion extending from the second side of the core.
2. The inductor of claim 1 , the first solder tab being disposed under the core.
3. The inductor of claim 1 , the multi-turn winding further comprising:
a third foil portion passing through the magnetic core from the first side to the second side; and
a second foil interconnect wrapping under the core to electrically couple a second end of the second foil portion extending from the first side of the core to a first end of the third foil portion extending from the second side of the core.
4. The inductor of claim 1 , the first and second foil portions passing through the core without forming any turns.
5. The inductor of claim 4 , the core having a rectangular shape.
6. The inductor of claim 1 , the multi-turn foil winding being a single-piece winding.
7. The inductor of claim 1 , a second end of the second foil portion extending from the first side of the core to form a second solder tab suitable for surface mount soldering to a printed circuit board.
8. The inductor of claim 7 , the second solder tab being disposed under the core.
9. The inductor of claim 8 , the second solder tab extending away from the core.
10. The inductor of claim 1 , the first solder tab extending away from the core.
11. A multi-turn inductor, comprising:
a magnetic core having a first side opposite a second side; and
a single-piece, multi-turn foil winding, including:
a first and a second foil portion each passing through the magnetic core from the first side to the second side, a first end of the first foil portion extending from the second side of the core to form a first solder tab suitable for surface mount soldering to a printed circuit board, and
a first foil interconnect wrapping under the core to electrically connect a second end of the first foil portion extending from the first side of the core to a first end of the second foil portion extending from the second side of the core.
12. The inductor of claim 11 , the first solder tab being disposed under the core.
13. The inductor of claim 11 , the first solder tab extending away from the core.
14. The inductor of claim 11 , the first and second foil portions passing through the core without forming any turns.
15. The inductor of claim 14 , the core having a rectangular shape.
16. The inductor of claim 11 , a second end of the second foil portion extending from the first side of the core to form a second solder tab suitable for surface mount soldering to a printed circuit board.
17. The inductor of claim 16 , the second solder tab being disposed under the core.
18. The inductor of claim 16 , the second solder tab extending away from the core.