This reference design provides 40W isolated 24V and 5V output with flyback topology. The power supply can be powered from 85VAC to 264VAC input. This design uses the UCC28740 valley-switching, flyback controller. A peak efficiency of 84.99% is reached and the device supports a 2400μF capacitive load with a start-up time of less than 611ms. The board is a single-side component placement PCB design which reduces manufacturing costs.