First zero standby power PSR for high-power AC/DC supplies

Introduced as the industry’s first, a new zero standby power controller chipset with the lowest standby power consumption for AC/DC fly-back power supplies up to 75W, the UCC28730 has been developed by Texas Instruments (TI). Taking power supply efficiency to the next level, the new UCC28730 primary-side regulation (PSR) fly-back controller with 700V start-up switch and UCC24650 wake-up monitor supports 5- to 24V output voltages and helps designers create smaller, more efficient power supplies for TVs; home appliances; AC adapters; heating, ventilation and air conditioning (HVAC); and building automation systems. A major design limitation with existing primary-side regulation power supplies today is poor transient response performance while trying to maintain low standby power. The UCC28730 and UCC24650 chipset achieves zero standby power consumption while achieving the best transient response performance possible. Besides reducing cost by eliminating feedback components such as an optocoupler and TL431, TI’s voltage droop-detection feature in the UCC24650 wake-up controller enables the use of tiny output capacitors while maintaining a narrow-output voltage-regulation window with zero- to full-load transients. A range of design support accessories is also offered. Booth No. 1001, Applied Power Electronics Conference and Expo (APEC), Charlotte, North Carolina, March 15-19.