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Picor EMI filter saves board space in converter apps

Posted: 08 Jul 2004 ?? ?Print Version ?Bookmark and Share

Keywords:picor? vicor? emi filter? qpi-4?

Targeting the telecommunications bus market, Picor, a subsidiary of Vicor Corp. offers a new active EMI filter for 48V dc-dc converter applications.

The company said the EMI filter's compact surface-mount package, measuring 25.4-by-25.4-by-5.1mm, offers a board space savings of 50 percent to 80 percent over passive EMI filter solutions.

Providing attenuation from 150kHz to 30MHz, the QPI-4 EMI filter delivers more than 40dB of common-mode and more than 70dB of differential-mode noise attenuation at 500kHz.

The QPI-4 meets the specifications for the international 36Vdc to 76Vdc telecom bus, including the 100V, 100ms surge requirement. Rated at 7A, the device supports single or multiple dc-dc converters requiring up to 336W of input power at 48V input. The QPI-4's ratings support the PICMG 3.0 Advanced Telecom Computing Architecture (ATCA) specification requiring system boards to be filtered to EN 55022 limits at 200W per system board.

The QPI-4 EMI filter requires 20 percent to 30 percent of the volume and 30 percent to 50 percent of the area of similarly rated passive filters, saving board space, according to the company. The surface-mount LGA package is rated for operation over a case temperature range of -40C to 100C with an efficiency of 99 percent. Units may be placed in series for higher attenuation.

The company said the QPI-4 supports all dc-dc converters in IT, telecommunications and other 48Vdc applications that require efficient filtering in small spaces. Packaged in antistatic tubes, the QPI-4 EMI filter is priced at $12.53 per 1,000 piece quantities. Delivery is from stock to six weeks.

- Gina Roos


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