QPI-3-EVAL1

USER GUIDE UG:311 QPI-x-EVAL1 QPI Series Active EMI Filters Evaluation Board The QPI-x-EVAL1 (x refers to the specific QPI model) is an easy-to-use evaluation board for testing the QPI family of active EMI filters. The board can be used in different EMI configurations (see Figures 1 and 2), with many of the standard DC-DC converters available. Consult the converter manufacturers recommendation for proper EMI re-circulation. The evaluation board includes a mounted QPI filter, input and output capacitors, and terminals blocks for easy electrical connection. When using the QPI-x-EVAL1 evaluation board, close attention must be paid to wiring and grounding. Wires should be kept as short as possible and positioned to minimize radiated noise pick up around the QPI filter. Refer to the Vicor QPI-AN1 application note for proper EMI measurement set up. Filter performance in the application is highly dependent on several factors and cannot be extrapolated from insertion loss curves alone. Final noise performance is a complex function of filter elements, equipment grounding and noise source impedances, which vary in magnitude and phase over the frequency spectrum of interest. Designers should be aware that to select and quantify an EMI filter for conducted noise, they must test the filter in their product under the set up and conditions specified in the applicable EMI standards. Measurements should be made in consultation with in-house compliance testing or an independent EMI test facility. Check www.vicorpower.com for data sheets, application notes and additional product information. Figure 1 Typical for open-frame Input BUS Converter EMI topology CY + + C1 QPI C2 DC-DC CY SHIELD SHIELD QPI-Active EVAL1 Figure 2 Typical for baseplate SHIELD Plane EMI topology Input BUS Converter + + C1 QPI C2 DC-DC CY CY CY CY SHIELD SHIELD QPI-Active EVAL1 UG:311 Page 1Figure 3 QPI-x-EVAL1 schematic Thermal1 Thermal2 IN+ 12 9 OUT+ BUS+ QPI+ 13 8 BUS+ QPI+ 14 7 BUS+ QPI+ C1 C2 QPI J1 47F 47F J2 3 15 4 1 BUS QPI 16 3 BUS QPI 2 IN 1 2 OUT 2 BUS QPI 1 3 Input BUS Converter SHIELD Figure 4 QPI-x-EVAL1 board showing location of components and connectors Ordering Information Part Number Description QPI-3-EVAL1 Evaluation board for QPI-3LZ QPI-4-EVAL1 Evaluation board for QPI-4LZ QPI-5-EVAL1 Evaluation board for QPI-5LZ QPI-6-EVAL1 Evaluation board for QPI-6LZ UG:311 Page 2 5 10 SHIELD Thermal 6 11 SHIELD Thermal