DC to DC converter apparatus

Claim 1

An improved DC to DC converter apparatus comprising: a generally rectangular, metal-backed first PC board including a metal layer, an insulating layer and a first circuit layer, the insulating layer being sandwiched between said metal layer and said first circuit layer, said first board having a first surface region and a second surface region, said second region having a plurality of electrical circuit components disposed thereon and electrically connected to conductive traces forming said first circuit layer; a second PC board comprised of a dielectric substrate having a second circuit layer on one side, said second board having mounted thereto a plurality of electrical circuit components and input and output pins electrically interconnected by the conductive traces of said second circuit layers; electrically conductive means affixing said second board to said first board in proximate, spaced apart relationship to said first region, said electrically conductive means serving to electrically interconnect the circuit traces of said first and second boards and to thermally interconnect said second board with said first board; and potting means encapsulating said first and second boards and their associated electrical components with only said input-output pins extending therefrom, one side of said first board forming a heat conducting external surface of the encapsulated device.