ACDC
Power Tips #139: How to simplify AC/DC flyback design with a self-biased converter
Introduction The demand for smaller, lighter, and more efficient AC/DC USB power delivery (PD) chargers is always a challenge for power-supply design engineers. Below 100 W, the quasi-resonant flyback is still the dominating topology, and gallium nitride (GaN) technology can push the power density and efficiency further. However, providing bias power for the primary controller…