➀ The article introduces an isolated power supply reference design using the QR method, highlighting its 20V output, advanced power management, and comprehensive safety features. ➁ The design is suitable for high-demand devices and ensures electrical safety and protection against interference. ➂ The evaluation board from ROHM provides an isolated 20V output with a range of 90 to 264 Vac and a maximum output current of 4.5 A.