The isolated auxiliary power reference design is an optimized 48W auxiliary power supply for high-voltage DC applications. It supports DC input voltages from 300VDC to 1,000V, which enables flexible usage in subsystems such as control systems and monitoring equipment that require a stable DC voltage with limited power needs.

The design provides high reliability, as it is a primary-side regulated flyback topology that does not need an optocoupler to keep the output in regulation. This is an advantage in harsh environments, where the optocoupler tends to be less reliable given LED degradation over time.