Transformers with separated magnetic members
In examples, a transformer device comprises a first magnetic member; a second magnetic member; and a substrate layer between the first and second magnetic members. The substrate layer comprises a transformer coil. The transformer device includes a third magnetic member inside the substrate layer. The transformer coil encircles the third magnetic member. The third magnetic member physically separates from the first and second magnetic members.
1 . A transformer device comprising:
a first magnetic member;
a second magnetic member;
a substrate layer between the first and second magnetic members, the substrate layer comprising a transformer coil, the transformer coil including an edge exposed on a surface of the substrate layer, the edge electrically coupled to a lead of the transformer device via a bond wire; and
a third magnetic member inside the substrate layer, the transformer coil encircling the third magnetic member, the third magnetic member physically separate from the first and second magnetic members, wherein a first surface of the third magnetic member is coplanar with a first surface of the substrate layer, and wherein a second surface of the third magnetic member is not coplanar with a second surface of the substrate layer; and wherein an insulation material in an orifice of the substrate layer contacts the third magnetic member.
2 . The transformer device of claim 1 , wherein the third magnetic member is in the orifice of the substrate layer.
3 . The transformer device of claim 1 , wherein the substrate layer includes a laminate material encircling the third magnetic member.
4 . The transformer device of claim 1 , wherein the insulation material is between the third magnetic member and the first magnetic member.
5 . The transformer device of claim 1 , further comprising a first adhesive layer between the third magnetic member and the first magnetic member.
6 . The transformer device of claim 5 , wherein the first adhesive layer abuts an insulation material.
7 . The transformer device of claim 5 , further comprising a second adhesive layer between the third magnetic member and the second magnetic member.
8 . The transformer device of claim 1 , wherein the first and second magnetic members comprise I-core magnetic members.
9 . A transformer device comprising:
a first I-core magnetic member;
a first adhesive layer coupled to the first I-core magnetic member;
insulation material coupled to the first adhesive layer;
a substrate layer coupled to the insulation material and having a transformer coil, the transformer coil including an edge exposed on a surface of the substrate layer;
a magnetic member encircled by the transformer coil;
a second adhesive layer coupled to the substrate layer; and
a second I-core magnetic member coupled to the second adhesive layer,
wherein the magnetic member is physically separate from the first and second I-core magnetic members, wherein a surface of the magnetic member is coplanar with the surface of the substrate layer.
10 . The transformer device of claim 9 , wherein the insulation material is between the magnetic member and the substrate layer.
11 . The transformer device of claim 9 , wherein the insulation material is between the magnetic member and the first I-core magnetic member.
12 . The transformer device of claim 9 , further comprising a second magnetic member in the substrate layer, the second magnetic member not encircled by the transformer coil.
13 . The transformer device of claim 9 , wherein the magnetic member has a thickness that is within plus or minus 5% of a thickness of the substrate layer.
14 . The transformer device of claim 13 , wherein the thickness of the magnetic member ranges from 200 micrometers to 400 micrometers.
15 . The transformer device of claim 9 , further comprising a mold compound abutting the first and second I-core magnetic members, the first and second adhesive layers, the insulation material, and the substrate layer.
16 . A transformer device comprising:
a first magnetic member;
a second magnetic member;
a substrate layer between the first and second magnetic members, the substrate layer comprising a transformer coil, a laminate material, and an insulation material contacting the laminate material; and
a third magnetic member inside the substrate layer and in between the laminate material, the transformer coil encircling the third magnetic member.
17 . The transformer device of claim 16 , wherein the third magnetic member is in an orifice of the substrate layer.
18 . The transformer device of claim 17 , wherein the insulation material abuts the third magnetic member and that is in the orifice of the substrate layer.
19 . The transformer device of claim 18 , wherein the insulation material is between the third magnetic member and the first magnetic member, and wherein the insulation material is in between the third magnetic member and the laminate material.