Chipset achieves zero standby power consumption

9th March 2015

Barney Scott

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Texas Instruments has introduced the industry’s first zero standby power controller chipset, with the lowest standby power consumption for AC/DC flyback power supplies up to 75W. The UCC28730 Primary-Side Regulation (PSR) flyback controller with 700V startup switch and UCC24650 wake-up monitor supports 5-24V output and enables smaller, more efficient power supplies for TVs, home appliances, AC adapters, HVAC and home automation.

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.

An intelligent sleep function adapts to converter-loading conditions and is able to disable system functions, adapt for AC relay control, or disable the synchronous rectifier at no load. A smart wake-up function enables 50% lower output capacitors while maintaining a tight output regulation window with zero to full load steps, improving efficiency and saving space.

This chipset solution is designed to work with TI’s ultra-low-power DC/DC converters, sensors, RF devices and MSP430 MCUs, to keep more system functions alive in standby mode while still maintaining zero standby consumption performance for the entire system. The UCC24650 is also compatible with TI’s UCC28633 PSR controller, which enables peak power delivery two times higher than rated name plates without a proportionate increase in magnetics size, making it optimal for applications such as printers, audio, gaming and industrial power supplies.

Design parameters can be entered to create a custom design using WEBENCH Power Designer or by downloading a fully tested TI Designs reference design for a 12W, 24V offline power supply (PMP10927) based on the UCC28730 and UCC24650 chipset. Designers can quickly evaluate and test their power-supply designs with the UCC28730EVM-552 10-W, 5-V evaluation module (EVM), available on TI's website.

TI will demonstrate the UCC28730 and UCC24650 at booth No. 1001 at the Applied Power Electronics Conference and Expo (APEC) in Charlotte, North Carolina, March 15-19. Both products are shipping in volume production and available for ordering through the TI Store and the company’s authorised distribution network. The UCC28730 flyback controller comes in a seven-pin SOIC package and is priced at US$0.45. The UCC24650 comes in a five-pin SOT-23 package and is priced at US$0.14 in 1,000-unit quantities.