The forward topology is a popular choice for isolated switch-mode power supplies that need high efficiency while also maintaining a minimal solution size. This presentation will highlight a reference design that utilizes a loss-less passive reset technique and GaN power FETs to meet both of these design goals. A design walk-through will highlight the underutilized transformer reset technique to show how it can reduce design complexity compared to a two-switch or active camp forward. It will also show how to use a PWM controller and half-bridge gate-driver to create a synchronous forward topology which leads to achieving high conversion efficiency.
