PWM controllers help meet Energy Star Level 5 regulations

PWM controllers help meet Energy Star Level 5 regulations

A portfolio of PWM controllers, the FAN675x, enables notebook power-supply designers to meet the stringent international energy-saving regulations including the Energy Star External Power Supply (EPS) version 2.0, Level 5 requirement that mandates 87% average active-mode efficiency. The first device in the family, the FAN6754, offers designers high-voltage startup to improve energy savings at light load by 25% when compared to alternative solutions. It also eliminates external protection circuits by incorporating overvoltage, overcurrent, and overtemperature protection plus brownout and line-compensation functions.

The controllers include frequency hopping to reduce EMI emissions by as much as 5 to 10 dB, and 8-ms internal soft start to reduce voltage stress on the MOSFET at startup. They lower the overall power consumption of notebook adapters, such as a proprietary green-mode function that provides off-time modulation to continuously decrease the switching frequency under light-load conditions. ($0.42 ea/1,000 — available now.)

Fairchild Semiconductor , South Portland , ME
Sales 207-775-8100
http://www.fairchildsemi.com