As products that take power supply efficiency to a new level, the UCC28730 PSR (Primary-side regulation) flyback controller with an integrated 700V start switch and the UCC24650 wake-up monitoring IC support output voltages from 5V to 24V, enabling the design of even more compact and highly efficient power supplies for TVs, home appliances, AC adapters, HVAC (Heating, Ventilation and Air Conditioning), and building automation systems. (For more detailed product information, please refer to www.ti.com/UCC28730-pr-kr)

Existing PSR (Primary-side regulation) products can maintain low standby power but have the problem of poor transient response performance. Now, by using the UCC28730 and UCC24650 chipsets, developers have been able to achieve zero standby power consumption while achieving excellent transient response performance. In addition, it can reduce costs by not requiring feedback devices such as optocouplers and TL431, and the UCC24650 wake-up controller integrates TI's proprietary voltage droop detection function, allowing it to maintain small output voltage fluctuations even during transient load characteristics from zero load to maximum load, even when using a small output capacitor.

TI plans to demonstrate the UCC28730 and UCC24650 at the Applied Power Electronics Conference and Expo (Booth #1001) in Charlotte, North Carolina, USA, from March 15 to 19.

Advantages of UCC28730 and UCC24650

• Industry's lowest system standby power consumption: Zero standby* power consumption of up to 75W can be achieved in adaptive relay control through an intelligent sleep function without additional components in a standard flyback design of up to 20W.

• 700V PSR controller (UCC28730): Since optocouplers and auxiliary feedback elements are not required, overall system costs can be reduced and reliability can be increased.

• Smart Wake-up Function: Even when using an output capacitor with 50% smaller capacity, it is possible to improve efficiency and save space by maintaining strict output regulation from zero load to maximum load step.

•Intelligent sleep function: It can adapt to converter load conditions, so it can stop system functions, apply AC relay control, or stop the synchronous rectifier under no-load conditions.

• 200V secondary side wake-up controller (UCC24650): No external clamp is required on Vdd or wake, and it can be used for 5~24V output voltages.

This chipset solution is designed to maintain zero standby power performance across the entire system while keeping more system functions in standby mode when used with TI’s ultra-low power DC/DC converters, sensors, radio frequency (RF) devices (such as SimpleLink™ CC26xx/CC13xx wireless microcontroller platforms), and MSP430™ microcontrollers. The UCC24650 is compatible with TI’s UCC28633 PSR controller and can deliver peak power up to twice the rated value without proportionally increasing the size of magnetic components, making it ideal for applications such as printers, audio, gaming, and industrial power supplies.

Tools and Support

You can reduce development time by creating a custom design by entering design parameters with the WEBENCH® Power Designer tool, or by downloading a fully tested TI Designs reference design for a 12W 24V offline power supply (PMP10927) based on UCC28730 and UCC24650 chipsets. In addition, the UCC28730EVM-552, a 10W, 5V evaluation module (EVM), is provided so that developers can evaluate and test their power supply designs more quickly, and TI Designs reference designs based on the EVM can be downloaded here.

Supply and Price

These products are currently in mass production and are available for purchase through the TI store and authorized distributors. The UCC28730 flyback controller is available in a 7-pin SOIC (small outline integrated circuit) package at $0.45 per unit in 1,000-unit quantities. The UCC24650 is available in a 5-pin SOT (small-outline transistor)-23 package at $0.14 per unit in 1,000-unit quantities.