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PWM controllers up efficiency at light load

Posted: 08 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:PWM controller? MOSFET? power supply?

Fairchild Semiconductor has developed a portfolio of pulse-width modulated (PWM) controllers that let notebook power-supply designers meet the stringent international energy-saving regulations. The controllers are designed to comply with the global focus on energy savings such as the Energy Star External Power Supply (EPS) ver 2 requirement that mandates 87 percent average active-mode efficiency to obtain compliance.

To meet these requirements, Fairchild has developed integrated PWM controllers, like the FAN6754, which offers designers high-voltage startup to improve energy savings at light load by 25 percent when compared to alternate solutions. It also eliminates external protection circuits by incorporating over-voltage, over-current and over-temperature protection plus brownout and line-compensation functions.

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

Additionally, Fairchild�s PWM controllers incorporate several design features that 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. Fairchild�s PWM devices offer a host of robust, accurate protection features built-in to protect the power supply and the load from failure, all without adding external components or circuitry.

The FAN6754 is part of a comprehensive portfolio of power products that improve efficiency to meet stringent energy efficiency standards, reduce component count, simplify design and improve power factor in today�s electronics.

They are priced at $0.42 each for 1K quantities and samples are available now. Give six weeks for delivery.

For application notes on PWM controller click here.

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