This document discusses the design of a high frequency transformer for multi-output switched mode power supplies (SMPS). It describes how high frequency transformers operate at frequencies between 20 kHz to over 1 MHz, allowing them to be smaller in size. Key challenges like skin and proximity effects are addressed through using litz wire and ferrite cores. The flyback topology is presented as it provides isolation, multiple outputs, and voltage adjustment through turns ratio. An example design calculates components for a flyback converter with three outputs of 20V, 12V and 5V rated for 22W maximum power.