Power Electronics

Active EMI Filter for Telecom Bus Market

Picor, a subsidiary of Vicor Corp., has introduced the QPI-4 active EMI filter for 48 V dc-dc converter applications. Providing attenuation from 150 kHz to 30 MHz, the QPI-4 delivers over 40 dB of common-mode and more than 70 dB of differential-mode noise attenuation at 500 kHz.

The QPI-4 is the latest member of Picor’s active EMI filter family for the telecom bus market, and its compact 1-in. x 1-in. x 0.2-in. (25.4 mm x 25.4 mm x 5.1 mm) surface-mount package offers board space savings of 50% to 80% over passive EMI filter solutions.

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

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

The QPI-4 supports all dc-dc converters in IT, telecom, and other 48-Vdc applications requiring efficient filtering in small spaces. The QPI-4 is packaged in anti-static tubes and is priced at $12.53 per 1000.

For more information, visit www.picorpower.com.

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