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QPI-X-EVAL1
QuietPower TM
Evaluation Board for Active EMI Filters
The QPI-X-EVAL1 is an easy to use evaluation board for testing the QPI family of active EMI filters. The evaluation board includes a mounted QPI, capacitors, optional RY resistor and screw terminals for electrical connections. When using the evaluation board, pay special attention to wiring and grounding. Wires should be kept as short as possible and positioned to minimize radiated pick up around the QPI. Refer to Figure 1 below and the QPI-AN1 application note for the proper measurement set up. Figure 2 shows the schematic of the QPI-X-EVAL1. Note that resistor RY is included with the evaluation board for use with non-resonant mode converters. To ensure the best results, make sure that the QPI shield connection is as close as possible to the common point of the bypass Y-capacitors and shield plane under the converters on the system board. Figure 3 shows the component locations on the EVAL board PCB. 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 qualify 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.picorpower.com for data sheets, application notes and additional product information.
LISN
BUS+
QPI+ CIN
VIN+
VOUT+
BUS SUPPLY
BUSLISN
QPI
SHIELD
CONVERTER
QPIC1 C2 VINVOUTC3 C4
Optional GND Connection LISN Ground Plane
RY
Figure 1 - Spectrum Analyzer Test Setup for the evaluation board (QPI and Converter 5mm above LISN Ground Plane)
Picor Corporation * www.picorpower.com
QPI-X-EVAL1 Data Sheet Rev. 1.2 Page 1 of 2
P7
P1 QPI-X EMI Filter BUS+ QPI+ BUS+ QPI+ BUS+ QPI+ Thermal 1 Thermal 2 BUSBUSBUSSHIELD SHIELD QPIQPIQPI-
P5
P6 J2
J1 3 2 1 Input BUS 47F Open C2 C1
12 13 14 10 11 15 16 1
9 8 7 6 5 4 3 2 C3 47F C4 3.3F
1 2 3 Converter
P2
P4
P3
Figure 2 - QPI-X EVAL1 schematic.
Figure 3 - QPI-X EVAL board showing location of components and connectors.
Ordering Information
Part Number QPI-1 EVAL1 QPI-2 EVAL1 QPI-3 EVAL1 Description Evaluation board for QPI-1L Evaluation board for QPI-2L Evaluation board for QPI-3L Part Number QPI-4 EVAL1 QPI-5 EVAL1 QPI-6 EVAL1 Description Evaluation board for QPI-4L Evaluation board for QPI-5L Evaluation board for QPI-6L
Vicor's comprehensive line of power solutions includes high-density AC-DC & DC-DC modules and accessory components, fully configurable AC-DC & DC-DC power supplies, and complete custom power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. No license is granted by implication or otherwise under any patent or patent rights of Vicor. Vicor components are not designed to be used in applications, such as life support systems, wherein a failure or malfunction could result in injury or death. All sales are subject to Vicor's Terms and Conditions of Sale, which are available upon request.
Specifications are subject to change without notice. Vicor Corporation 25 Frontage Road, Andover, MA, USA 01810 Tel: 800-735-6200 Fax: 978-475-6715
Picor Corporation * www.picorpower.com * QPI-X-EVAL1 Data Sheet
Email Vicor Express: vicorexp@vicr.com Technical Support: apps@vicr.com
Rev. 1.2 12/04/10M

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