Picor Corporation www.picorpower.com
QPI-X-EVAL1 Data Sheet Rev. 1.2 Page 1 of 2
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.
BUS+
QPI+
BUS-
QPI-
SHIELD
BUS
SUPPLY
QPI
VIN+
VOUT+
VIN-
VOUT-
CONVERTER
Optional GND
Connection
C
1
C
2
C
3
C
4
RY
C
IN
LISN
LISN
LISN Ground Plane
Figure 1 - Spectrum Analyzer Test Setup for the evaluation board (QPI and Converter 5mm above LISN Ground Plane)
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.
QPI-X-EVAL1
QuietPower
TM
Evaluation Board for Active EMI Filters
Picor Corporation www.picorpower.com QPI-X-EVAL1 Data Sheet Rev. 1.2 12/04/10M
Vicor Corporation
25 Frontage Road, Andover, MA, USA 01810
Tel: 800-735-6200 Fax: 978-475-6715
Email
Vicor Express: vicorexp@vicr.com
Technical Support: apps@vicr.com
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.
Figure 2 - QPI-X EVAL1 schematic.
1
2
3
Input BUS
J1
Open
1
2
3
Converter
J2
P1
P2
P4
P5
P3
47
F
C2
C1
3.3
F
C4
47
F
C3
P7
P6
QPI+
9
QPI+
7
SHIELD
6
QPI-
3
QPI+
8
Thermal 1
10
QPI-
2
BUS-
1
QPI-
4
BUS+
14
BUS-
16
BUS-
15
BUS+
13
BUS+
12
Thermal 2
11
SHIELD
5
QPI-X EMI Filter
Figure 3 - QPI-X EVAL board showing location of components and connectors.
Part Number
Description
QPI-1 EVAL1
Evaluation board for QPI-1L
QPI-2 EVAL1
Evaluation board for QPI-2L
QPI-3 EVAL1
Evaluation board for QPI-3L
Part Number
Description
QPI-4 EVAL1
Evaluation board for QPI-4L
QPI-5 EVAL1
Evaluation board for QPI-5L
QPI-6 EVAL1
Evaluation board for QPI-6L
Ordering Information
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