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Power switch with low power stand-by mode

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FAIRCHILD Semiconductor, represented by Arrow , has introduced three new Fairchild Power Switch (FPS) products featuring burst mode operation for stand-by mode.

The new switches operated under 0.1W at 265V ac in stand-by mode, meeting the International Energy Agency's (IEA) "1-Watt Initiative" which aims to reduce stand-by power losses to below 1W.

The FSD200, FSD210, and FSDM311 significantly reduce bill of material costs while achieving high-efficiency and obtaining regulatory compliance.

The unique integration of each FPS product minimises external components, simplifies designs, and lowers costs in target applications, such as battery chargers and adapters, mobile phones, PDAs, MP3s, C-TVs, monitors and PC auxiliary power.

The integrated off-line power switches combine a fully avalanche-rated SenseFET (LDMOS) for current sensing (650V or 700V minimum breakdown ratings) with a voltage mode PWM IC. The switches are also equipped with a built-in start-up switch, eliminating the need for an external start-up resistor.

The FSD200 eliminates the transformer auxiliary winding.

"With their 1W stand-by power, Fairchild's new FPS devices are efficient and environmentally friendly," said Fairchild's product marketing manager for the Fairchild Power Switch, SangTae Im.

"In addition, these integrated products provide performance superior to MOSFET/controller or RCC switching converter solutions, while offering the benefits of reduced board space and improved reliability through various protection circuits."

The FPS products are self-biased and protected, linear control current-to-duty cycle converters with open drain output. They operate from 6.7V to 21V at a frequency of 134kHz with frequency modulation for low EMI. Additional features include internal soft start to reduce the overshoot current at plug in, overload protection, over current protection and internal thermal shutdown protection.

Both the FSD200 and FSD210 are available in 7-DIP packages while the FDSM311 is available in an 8-DIP package.

From 2004, the products will be available in lead-free packaging that meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020B and is compliant with the European Union requirements, which will take effect in 2005.

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