Active filter keeps it quiet on the 48V bus

The QPI-1 is an active EMI filter designed specifically for 48V DC/DC convertor applications.

The QPI-1 is an active EMI filter designed specifically for 48V DC/DC convertor applications.

The QPI-1 delivers over 40dB of common-mode and more than 80dB of differential-mode noise attenuation at 500kHz from a 24.5 x 24.5 x 5.1mm surface-mount package.

The QPI-1 is the first ever active EMI filter for the telecomms bus market, and offers 50 to 80% board space savings over other solutions.

Active filtering eliminates ringing on the input of the convertor in response to load and line transients.

Unlike passive solutions, the QPI-1 attenuates noise over the entire frequency range.

There are no resonant elements that can amplify the noise.

The QPI-1 meets the specifications of the international 36 to 76V DC telecomms bus, including the 100V, 100ms surge.

Rated at 12A, the unit supports single or multiple DC/DC convertors up to 576W at nominal line voltage.

The QPI's ratings support the PICMG 3.0 Advanced Telecom Computing Architecture (ATCA) specification requiring system boards to be filtered to EN55022 limits at 200W per system board.

Units can be placed in series for higher attenuation or paralleled for higher currents.

The QPI-1 requires only 20-30% of the volume and 30-50% of the area of similarly rated passive filters, saving crucial board space.

The LGA or BGA package is rated for operation over a case temperature range of -40 to +100C with an efficiency of 99%.

The QPI-1 supports all DC/DC convertors in IT, telecomms and other 48V DC applications requiring efficient filtering in small spaces.

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