Active EMI filters for DC-DC converters

23 February 2005 Circuit & System Protection

Vicor subsdiary, Picor, has introduced three new additions to the QPI family of active EMI filters. The new products, QPI-3, QPI-5 and QPI-6, support 24 and 48 V DC-DC converter applications with higher current ratings and lower costs. Providing attenuation from 150 kHz to 30 MHz, the QPI products deliver over 40 dB of common-mode and more than 70 dB of differential-mode noise attenuation at 500 kHz.

All products are pin and footprint compatible with previous versions in compact (25,4 x 25,4 x 5,1 mm) surface-mount packages, offering board space savings of 50% to 80% over passive EMI filter solutions.

The QPI-6 meets the specifications for the international 36 to 76 V d.c. telecom bus, including the 100 V, 100 ms surge requirement. Rated at 14 A, the unit supports single or multiple DC-DC converters requiring up to 672 W of input power at 48 V input. The QPI-3 and QPI-5 operate over a 10 to 40 V d.c. range to support industrial bus and COTS defence applications. The QPI-3 and QPI-5 are rated at 7 and 14 A, respectively. The units support single or multiple DC-DC converters requiring up to 360 W of input power at 24 V input.

The surface-mount LGA package is rated for operation over a case temperature range of -40 to +100°C with an efficiency of 99%. Units may be placed in series for even higher attenuation.

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