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PWM controllers improve efficiency at light load

San Jose, Calif.—Fairchild Semiconductor has developed pulse-width modulated (PWM) controllers that enable notebook power-supply designers to meet the stringent international energy-saving regulations. These include the ENERGY STAR External Power Supply (EPS) version 2.0 requirement that mandates 87 percent average active-mode efficiency to obtain compliance.

Fairchild's integrated PWM controllers, including the FAN6754, offer designers high-voltage startup to improve energy savings at light load by 25 percent when compared to alternate solutions, according to the company It also eliminates external protection circuits by incorporating over-voltage, over-current and over-temperature protection plus brownout and line-compensation functions.

Other features of Fairchild's PWM controllers include frequency hopping, which reduces EMI emissions by as much as 5-10 dB, and internal soft start (8 ms) to reduce voltage stress on the MOSFET at start up.

Pricing: In 1K quantities, $0.42 each.
Availability: Samples available now; Delivery: 6 weeks.
Datasheet: click here.

Fairchild Semiconductor, www.fairchildsemi.com

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