Supporting 5–24 V output voltages, UCC28730 primary-side regulation (PSR) flyback controller with 700 V startup switch and UCC24650 wake-up monitor is suited for AC/DC power supplies up to 75 W. Smart load monitor with wake-up feature enables rapid step response with tiny output capacitors. Adapting to converter-loading conditions, intelligent sleep function can disable system functions, adapt for AC relay control, or disable synchronous rectifier at no load.