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CS106 Fiches technique(PDF) 4 Page - SynQor Worldwide Headquarters |
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CS106 Fiches technique(HTML) 4 Page - SynQor Worldwide Headquarters |
4 / 9 page Product # MCOTS-F-270-P-QT Phone 1-888-567-9596 Doc.# 005-0005521 Rev. H 10/20/16 Page 4 MCOTS-F-270-P-QT Current: 4A -300 -250 -200 -150 -100 -50 0 50 1.00E+03 1.00E+04 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency (Hz) Common Mode Attenuation Differential Mode Attenuation LISN LISN Source 50Ω 50Ω Vin(+) Vin(-) Vout(-) Inoise Imeas Vout(+) EMI Filter Com In Com Out LISN LISN Source 50Ω 50Ω EMI Filter Vin(+) Com In Vin(-) Vout(-) Com Out Inoise Imeas Vout(+) Basic Operation and Features This module is a multi-stage differential-mode and common-mode passive EMI filter designed to interface a power source with one or more Mil-COTS dc-dc converters (or other loads that create EMI). Each stage of this filter is well damped to avoid resonances and oscillations, and only X7R multi- layer ceramic capacitors are used. This Mil-COTS EMI filter includes a large bulk capacitor with a series damping resistor to correct for the unstabilizing effect of a converter’s negative input resistance. A white paper discussing this negative input resistance and the need for corrective damping can be found on the SynQor website (see Input System Instability application note). A typical application would place the Mil-COTS filter close to the input of the dc-dc converter. The input-side common-mode pin would be connected to the chassis ground that is common with the system input line filter or other earthed point used for EMI measurement. The output-side common- mode pin would be connected to the output ground or plane of the power converters with as low inductance a path as possible. There are no connections to the metal baseplate, which may also be connected to the chassis ground if desired. Do not connect the outputs of multiple Mil-COTS filters in parallel. Connecting filters in this manner may result in slightly unequal currents to flow in the positive and return paths of each filter. These unequal currents may cause the internal common-mode chokes to saturate and thus cause degraded common-mode rejection performance. Figure A: Simulation of calculated common mode and differential mode attenuation. The curves plot the ratio of noise current in a 50Ω LISN sensing port connected to the noise output side of the filter (the power input side, pins 1 and 3) to the noise current on the input side (the power output side, pins 4 and 6). Refer to Figures B and C. Figure B: Differential-Mode Current Attenuation, Imeas / Inoise Figure C: Common-Mode Current Attenuation, Imeas / Inoise |
Numéro de pièce similaire - CS106 |
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Description similaire - CS106 |
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