VICOR QPI-12-CB1

®
QPI-12-CB1
QUIETPOWER ™
QPI-12LZ Filter Carrier Board for 48 V V•I Chip EMI Evaluation
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1
Board overview . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Board assembly . . . . . . . . . . . . . . . . . . . . . . . . Page 3
V•I Chip mounting configurations . . . . . . . . . Page 3
EMI bypass configurations. . . . . . . . . . . . . . . . Page 4
EMI performance and test set up . . . . . . . . . . Page 4
Typical EMI performance . . . . . . . . . . . . . . . . . Page 5
Mechanical drawings . . . . . . . . . . . . . . . . . . . . Page 6
Ordering information . . . . . . . . . . . . . . . . . . . Page 6
Additional resources . . . . . . . . . . . . . . . . . . . . Page 6
QPI-12-CB1 carrier board featuring
the QPI-12LZ EMI filter
Introduction
QPI-12LZ Product Description
The QPI-12-CB1 carrier board is an evaluation
board platform designed to demonstrate the EMI
capabilities of a QPI-12LZ filter, with any combination
of 48 V input PRM / VTM or BCM evaluation boards.
The QPI-12-CB1 board includes a pre-mounted filter
along with some additional components necessary to
demonstrate the full functionality of the filter, along
with mounting areas for V•I Chip evaluation boards.
This User’s Guide provides basic instructions for
assembly and use of the board. Further information on
the functionality of the V•I Chip boards, as well as the
QPI-12LZ can be found in the V•I Chip Evaluation Board
User’s Guide as well as the V•I Chip and QPI-12LZ
data sheets.
The QPI-12LZ EMI filter is specifically designed to attenuate
conducted common-mode (CM) and differential-mode
(DM) noise of Vicor’s V•I Chip products to comply with the
CISPR22 standard requirements for conducted noise
measurements. The filter is designed to operate up to 80
Vdc continuous, with a 100 Vdc surge for 100 ms, and
supports 7 A loads up to 60°C without derating.
Picor Corporation • www.picorpower.com
Designed for the telecom bus range, the V•I Chip EMI Filter
®
supports the PICMG 3.0 specification for filtering system
boards to the EN55022 Class B limits.
QPI-12-CB1 Data Sheet Rev. 1.0 Page 1 of 6
For PRM
Placement
ement
For BCM
Plac
Placement
For VTM
Placement
C2
C1
QPI-12LZ
Shield Connection
CY5 – CY10
Bill of Materials
Ref Designator
Description
QPI
QPI-12LZ SiP
CI
Capacitor, electrolytic, 47 uF, 100 V
C2
Capacitor, ceramic, 2.2 uF, 100 V
CY5 thru CY10
Capacitor, X7R ceramic, 4.7 nF, 1,000 V
Hardware
Machine screw, pan head, 0.373", 1/2" long, #10-24 thread
Hardware
Machine nut, hex, 3/8", #10-24 thread
CY1 thru CY4
Optional Y-Cap configuration (not populated)
Figure 1 – QPI-12-CB1 board overview
1
VTM_IN+
2
JBCM+
3
1
VTM_OUT+
2
JVOUT+
3
As noted above: CY1 thru CY4 not populated.
2
SHIELD
SHIELD
Vin-
10 BUS1 BUS-
1
JVIN-
1
EMI+ 7
EMI+ 6
PRM+
VTM_IN+ 5
2
BCM+
EMI- 5
EMI- 4
3
BCM-
VTM_OUT+ 6
VTM_OUT- 7
4
-In
VTM_IN-
PRM-
VTM_OUT+
CY1
4.7 nF
Vout+
Vout-
CY2
4.7 nF
8
VTM_OUT-
3
C1
47 uF
VINVIN-A
+In
8 BUS+
9 BUS+
VIN+
CY8
4.7 nF
Carrier
QPI-12LZ
Vin+
C2
2.2 uF
CY7
4.7 nF
4.7nF
2
VIN+A
VTM_IN+
CY3
1
JVIN+
CY5
4.7 nF
2
CY6
4.7 nF
4.7 nF
Shield
CY9
4.7 nF
CY4
CY10
4.7 nF
VTM_IN-
Shield
1
VTM_OUT-
2
JVOUT-
3
1
VTM_IN-
2
JBCM-
3
Figure 2 – QPI-12-CB1 carrier board schematic
Picor Corporation • www.picorpower.com
QPI-12-CB1 Data Sheet Rev. 1.0 Page 2 of 6
Board Assembly
The V•I Chip evaluation boards should be attached to the
carrier board using the hardware provided. Begin by
removing the top nuts from the bolts in the space provided
for mounting the evaluation board. Check to see that the
lower bolts are tightened. Remove rubber spacers from the
V•I Chip evaluation board(s). Place the V•I Chip evaluation
board on the bolts. Make sure that the evaluation board is
placed in the proper input to output orientation with
respect to the carrier board (the input side will have the
capacitor). Replace the top nuts and tighten gently with
a wrench. Attach input and output leads, be careful to
confirm proper polarity before powering up.
When using the carrier board pay special attention to the
wiring and grounding. Wires should be kept as short as
possible and positioned to minimize radiated noise pick-up
on the QPI-12LZ.
Figure 3 – Side view hardware assembly
Figure 4 – QPI-12-CB1 carrier board assembled with PRM and VTM evaluation boards
Figure 5 – QPI-12-CB1 carrier board assembled with BCM evaluation board
Picor Corporation • www.picorpower.com
QPI-12-CB1 Data Sheet Rev. 1.0 Page 3 of 6
EMI Bypass Configurations
using the basic base-plate standard “Y” cap
configuration. Figure 7 shows the basic EMI
measurement set up that was used to achieve these
results. Figure 8 shows the alternate set up method when
converting to the open-frame approach.
EMI bypass capacitors (“Y” capacitors) are an essential
element in a switch-mode DC-DC filter application as
these capacitors provide a return path for commonmode noise currents to their source; so careful attention
to bypass capacitor implementation is essential for a
successful EMI filter design. This carrier board is
preconfigured in a “base-plate” EMI topology, which
uses six “Y” capacitors (only four are actually used in a
BCM configuration), as illustrated in Figure 7 below.
This is the preferred topology for VI Chip applications.
The carrier board can be manually reconfigured to an
“open frame” topology, which uses four “Y” caps in a
PRM/VTM combination (two for a BCM), as shown in
Figure 8. The open-frame approach may attenuate
certain load dependent noise better than the base-plate
method. The carrier board provides an ideal test vehicle
for making a comparison between the two “Y”
capacitor configurations. To reconfigure to “open
frame” carefully remove capacitors CY5 through CY10
and place four of those six capacitors in the positions
marked as CY1 through CY4.
In Figure 7 (base-plate method), capacitors CY5 through
CY10 represent the recirculation capacitors that are
connected to each of the four input and output
terminals, then are commoned to a shield plane that has
been created underneath the converter. Since the PRM/
VTM pair is similar to a conventional converter, which is
split into to halves, two additional “Y” caps (CY7 and
CY9) were added to the PRM’s output (the input to the
VTM), referenced to the shield plane.
In Figure 8 (open-frame method), four “Y” capacitors are
used (CY1 through CY4) rather than the two “Y” caps
that a conventional converter would require, once again
because of the topology split created by the pair.
In a BCM application there is no topology split so the set
up would require two fewer capacitors for either
configuration. The open-frame method would only need
one pair of input an output caps, referenced to the
shield plane on either side of the BCM. And for openframe method a pair of “Y” caps across the positive
input to positive output, and negative input and
negative output would be sufficient.
EMI Performance and Test Set Up
The EMI plots in Figures 9 through 14 are the total noise
measurements, on both the positive and negative lines
of the QPI-12LZ with various V•I Chip configurations,
Shielded Box
~1.25 m
PCB Board
PCB Plane Under Converter
BUS+
LISN
QPI+
VIN+
VOUT+
VIN+
VOUT+
C1
BUS
SUPPLY
QPI
PRM
VTM
47 uF
SHIELD
BUS-
LISN
QPI-
VIN-
CY5
VOUT-
CY6
VIN-
CY9
VOUT-
CY7
CY10
CY8
Shield Plane (Earth Ground)
Figure 7 – Basic EMI measurement setup for “base-plate” configuration.
Shielded Box
~1.25 m
CY3
PCB Board
BUS+
LISN
QPI+
VIN+
VOUT+
CY1
VIN+
VOUT+
C1
BUS
SUPPLY
QPI
PRM
VTM
47 uF
SHIELD
BUS-
LISN
QPI-
VIN-
VOUT-
CY4
VIN-
PCB Plane
Under Converter
VOUT-
CY2
Shield Plane (Earth Ground)
Figure 8 – Basic EMI measurement setup for “open-frame” configuration.
Picor Corporation • www.picorpower.com
QPI-12-CB1 Data Sheet Rev. 1.0 Page 4 of 6
Figure 9 – Total noise QPI-12LZ* with 48 V input PRM and
3V output VTM. 3.27 A input current. 160 W output load.
Figure 12 – Total noise QPI-12LZ* with 48 V input, 3 V output BCM.
3.18 A input current. 160 W output load.
Figure 10 – Total noise QPI-12LZ* with 48 V input PRM and
12 V output VTM. 4.03 A input current. 180 W output load.
Figure 13 – Total noise QPI-12LZ* with 48 V input,
12 V output BCM. 3.75 A input current. 180 W output load.
Figure 11 – Total noise QPI-12LZ* with 48 V input PRM and
48 V output VTM. 3.45 A input current. 160 W output load.
Figure 14 – Total noise QPI-12LZ* with 48 V input,
48 V output BCM. 3.20 A input current. 153 W output load.
* These EMI plots are actually based on QPI-10LZ, which includes the same filter elements but includes integrated hot-swap.
Picor Corporation • www.picorpower.com
QPI-12-CB1 Data Sheet Rev. 1.0 Page 5 of 6
4.585
2.435
0.000
3.200
3.200
+In
CY3
2.800
Vin+
2.250
2.150
2.050
CY1
QPI / V•IChip Carrier Board
2.815
CY8
CY7
CY5
Vout+
For QPI-11 or QPI-12 filter models
Reorder # QPI-xx-CB1*
* xx indicates model
2.350
2.150
1.950
+In
Vin+
C2
CY6
Plane CY4
-In
0.385
CY2
0.000
7.200
0.850
0.000
CY10
Carrier
2.500
5/07 revC
CY9
5.600
0.400
0.250
1.250
1.050
0.850
Vout-
SHIELD
Vin-
0.000
Vout-
-In
Vin-
5.100
1.050
0.850
0.650
Vout+
BCM+
VTM
BCM-
PRM
7.950
C1
BCM
QPI-12LZ
Figure 17 – Mechanical drawing for QPI-12-CB1
Ordering Information
Carrier Board Part Number
Compatible V•I Chip Evaluation Boards (sold separately)*
QPI-12-CB1
PRMs: P048F048T12AL-CB, P048F048T24AL-CB,
P048F048T17AL-CB, P048F048T32AL-CB,
VTMs: All 48 V input models
BCMs: All 48 V input models
* Some V•I Chip products exceed the current rating and therefore may not be compatible when operating at full load
Additional Resources Online
QPI-12LZ Data Sheet
http://vicorpower.com/picorpower/data_sheets/#input_filters
V•I Chip Data Sheets and User Guides
http://vicorpower.com/products/vichip/
Picor Corporation • www.picorpower.com
QPI-12-CB1 Data Sheet Rev. 1.0 Page 6 of 6
5/08