TI’s Flyback Controller Surpasses Energy Star 5 Standby Requirements for 10- to 65-W Adapters
Expanding its line of energy-efficient, no-load adapter power controllers, Texas Instruments Incorporated (TI) announced the industry’s first flyback controller that exceeds Energy Star 5 standby power requirements for 10- to 65-W ac-dc adapters used with notebooks, motor control, smart meters, micro-inverters and other high-powered applications. Used in conjunction with TI’s award-winning WEBENCH® online design tool, the LM5023 flyback controller simplifies and speeds high-voltage dc-dc designs.
TI’s new LM5023 isolated quasi-resonant pulse-width modulation (PWM) controller with integrated 700-mA driver offers high efficiency at up to 90 percent, low EMI and less than 10-mW of standby power. The LM5023 provides 1-percent accurate output voltage regulation, eliminating the need for cable compensation. When coupled with the highly accurate LMV431 shunt reference, it provides a competitively priced, 1-percent accurate flyback controller system.
Key features and benefits of the LM5023 include: One- percent voltage output regulation over line, load and temperature eliminates the need for cable compensation. Exceeds Energy Star 5 and European Commission 5-Star requirements for stand-by power (greater than 30 mW): Operates at low-power skip mode for ultra-low stand-by power, or less than 10 mW at 230 Vac. This minimizes energy-wasting vampire effect of ac-dc power supplies.
Quasi-resonant operation improves efficiency while lowering EMI emission versus fixed frequency schemes. Integrated 700-mA gate driver drives large FETs for higher power outputs without additional components. Hiccup-mode overload protection reduces the stress on power components during overload conditions, increasing system reliability. Critical conduction mode results in higher efficiencies, reducing switching losses through lower EMI and the use of a less expensive rectifier diode.
Adapter power products from TI, including the LM5023, UCC28710, UCC28710 and UCC24610 primary and secondary PWM controllers, provide reliable, efficient, low-cost power solutions for a wide range of AC/DC charger and adapter applications. Innovative, high-efficiency power management controllers reduce both energy consumption and solution size. Universal charge controllers help designers minimize environmental impact and reduce charging times with standards compliance. With or without wires, TI solutions provide best-in-class no load power performance and highest average system efficiency.
Samples can be requested today and production quantities of the LM5023 are expected to be available in the second quarter. Offered in an 8-pin MSOP package, the LM5023 is priced at US$0.38 in quantities of 1,000.
