The invention discloses a PCB and a production method and application thereof, the PCB comprises a PCB substrate, the PCB substrate is provided with a plurality of pads, a planar
transformer and a plurality of lines, the PCB substrate is provided with first grooves corresponding to the pads one by one, and the PCB substrate is provided with second grooves corresponding to the planar
transformer;
copper foil
layers are deposited on the inner wall of the first groove and the surface of the PCB substrate corresponding to the plurality of lines, so that a bonding pad and lines are formed, and a
tin alloy layer is arranged on the
copper foil layer corresponding to the bonding pad area; the planar
transformer is embedded in the second groove, the planar transformer comprises a
magnetic core and a coil, and the coil is electrically connected with the
copper foil layer. According to the invention, the generation of
welding spot bubbles can be effectively avoided, the
welding quality and the heat dissipation performance can be improved, the production process can be simplified, the production cost can be reduced, and the
product integration can be improved.