No switching supply is complete without a flyback transformer. On the :
Unlike combo boards that house an integrated high-voltage power supply, the T.SK105A.03 is powered by an external (typically requiring a 3A to 5A adapter). In the schematic, the 12V rail distributes power to several step-down buck regulators and linear drop-out (LDO) regulators to generate the secondary voltage rails needed by the chipsets: T.sk105a.03 Schematic Diagram