VICOR QPI-10-CB1

®
QPI-10-CB1
QUIETPOWER ™
QPI-10LZ 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
OV and UV adjustments . . . . . . . . . . . . . . . . . Page 6
Mechanical drawings . . . . . . . . . . . . . . . . . . . Page 7
Ordering information . . . . . . . . . . . . . . . . . . . Page 7
Additional resources . . . . . . . . . . . . . . . . . . . . Page 7
QPI-10-CB1 carrier board featuring
the QPI-10LZ EMI filter with
integrated Hot-Swap
Introduction
QPI-10LZ Product Description
The QPI-10-CB1 carrier board is an evaluation
board platform designed to demonstrate the EMI
and Hot-Swap capabilities of a QPI-10LZ filter, with
any combination of 48 V input PRM / VTM and BCM
evaluation boards. The QPI-10-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-10LZ can be found in
the V•I Chip Evaluation Board User’s Guide as well as
the V•I Chip and QPI-10LZ data sheets.
The QPI-10LZ integrates a complete 48 V Hot-Swap function
with an EMI filter to achieve a high performance, high
density solution for V•I Chip applications, while minimizing
overall design time and effort. The product aligns with the
TM
AdvancedTCA PICMG3.0 requirements for hot insertion
and board level conducted noise limitations. The EMI filter
provides conducted common-mode (CM) and differentialmode (DM) noise attenuation from 150 kHz to 30 MHz.
The QPI-10LZ is designed for use on a 48 or 60 Vdc bus
(36 – 76 Vdc). The inrush current limit and circuit breaker
are designed to satisfy the 200 W per board PICMG3.0‚
limit up to 70°C PCB temperature around the QPI-10LZ.
Picor Corporation • www.picorpower.com
The under and overvoltage thresholds can be trimmed
separately via the UVEN and OV inputs using external
series resistors. The QPI-10LZ provides two POWER GOOD
signals, with one referenced to the input ground and the
other to the output ground, which can be used to enable
other circuits along with the V•I Chip converter.
QPI-10-CB1 Data Sheet Rev. 1.1 Page 1 of 7
SW 1
UV/OV
Settings
For PRM
Placement
R1, R2
For BCM
Placement
For VTM
Placement
C2
C1
QPI-10LZ
Shield Connection
CY5 – CY10
Bill of Materials
Ref Designator
Description
QPI
QPI-10LZ 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
R1, R2
Resistor, 75 K, 1%, 0.25 W
SW1
Switch, 4 position SM DIP, half pitch
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-10-CB1 board overview
1
2
GDH04S
7
4
1
SW1C
GDH04S
OV
6
UV
VIN1
2
10
9
PWRGD2
OV
PWRGD1
BUSBUS2
VIN-
VIN-A
QPI
1
PRM+
2
BCM+
3
4
QPI- 6
QPI- 5
VOUT-
CY8
4.7 nF
Carrier
VOUT+
SW
SHIELD
16
1
QPI+ 8
QPI+ 7
QPI-10LZ
4
15
CY7
4.7 nF
4.7 nF
UVEN
SW
C1
47 uF
BUS+
BUS+
SW
C2
2.2 uF
12
13
14
3
VIN+
VIN+
VTM_IN+
CY3
2
VIN+A
JVIN-
2
As noted above: CY1 thru CY4 not populated.
5
11
JVIN+
3
R1
75K
R2
75K
SW1D
GDH04S
1
2
8
SW1B
1
UV-OV PWRGD
SW1A
GDH04S
CY5
4.7 nF
CY6
4.7 nF
BCMPRM-
VTM_IN+
5
VTM_OUT+
6
VTM_OUT-
7
VTM_IN-
8
CY1
4.7 nF
CY2
4.7 nF
CY9
4.7 nF
CY4
4.7 nF
VTM_OUT+
VOUT+
VOUTVTM_OUTCY10
4.7 nF
VTM_IN-
Shield
Shield
Figure 2 – QPI-10-CB1 carrier board schematic
Picor Corporation • www.picorpower.com
QPI-10-CB1 Data Sheet Rev. 1.1 Page 2 of 7
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-10LZ.
Figure 3 – Side view hardware assembly
Figure 4 – QPI-10-CB1 carrier board assembled with PRM and VTM evaluation boards
Figure 5 – QPI-10-CB1 carrier board assembled with BCM evaluation board
Picor Corporation • www.picorpower.com
QPI-10-CB1 Data Sheet Rev. 1.1 Page 3 of 7
EMI Bypass Configurations
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.
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.
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
open-frame 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-10LZ with various VI Chip configurations,
Shielded Box
~1.25 m
PCB Board
PCB Plane Under Converter
BUS+
QPI+
VIN+
VOUT+
VIN+
VOUT+
LISN
C1
BUS
SUPPLY
QPI
PRM
VTM
47 uF
BUSLISN
SHIELD
SW
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
CY3
~1.25 m
CY1
PCB Board
BUS+
QPI+
VIN+
VOUT+
VIN+
VOUT+
LISN
C1
BUS
SUPPLY
QPI
47 uF
BUSLISN
SHIELD
SW
PRM
QPI-
VIN-
VOUT-
CY4
VTM
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-10-CB1 Data Sheet Rev. 1.1 Page 4 of 7
Figure 9 – Total noise QPI-10LZ with 48 V input PRM and
3V output VTM. 3.27 A input current. 160 W output load.
Figure 12 – Total noise QPI-10LZ with 48 V input, 3 V output BCM.
3.18 A input current. 160 W output load.
Figure 10 – Total noise QPI-10LZ with 48 V input PRM and
12 V output VTM. 4.03 A input current. 180 W output load.
Figure 13 – Total noise QPI-10LZ with 48 V input, 12 V output BCM.
3.75 A input current. 180 W output load.
Figure 11 – Total noise QPI-10LZ with 48 V input PRM and
48 V output VTM. 3.45 A input current. 160 W output load.
Figure 14 – Total noise QPI-10LZ with 48 V input, 48 V output BCM.
3.20 A input current. 153 W output load.
Picor Corporation • www.picorpower.com
QPI-10-CB1 Data Sheet Rev. 1.1 Page 5 of 7
Modifying OV & UV, Power Good Status
The QPI-10LZ is designed to have an undervoltage
hysteretic range of 32 – 34 V when the UVEN pin is
tied to the BUS+ pin with no additional series resistance.
The QPI-10LZ becomes enabled when the input voltage
exceeds 34 V and continues to work down to 32 V
before being disabled.
The overvoltage hysteretic range is designed to be
72 – 76 V when the OV pin is tied to the BUS+ pin
without a trimming resistor in series. The QPI-10LZ
remains functioning until the OV surpasses 76 V,
where it will shutdown until the input voltage falls
below 72 V.
External resistors can be added to trim the UV and OV
trip points higher. The graph in Figure 15 shows the
trimming effect for a range of external series resistors.
This carrier board provides a means to modify the
overvoltage and undervoltage trip points by utilizing
the four position dip switch. (See Figure 16) The
overvoltage and undervoltage setting as well as the
POWER GOOD signals can be accessed through plated
through holes on the board. Switches SW 1A and 1B, in
the ON position, adds a 75 k pull-up resistor to the
POWER GOOD pins. Refer to QPI-10LZ data sheet for
more information on these functions.
OFF
ON
UV/OV Trim
90.00
OV-High
80.00
OV-Low
70.00
Voltage
1A
1B
1C
1D
60.00
50.00
UV-High
40.00
UV-Low
30.00
0
5000
10000
15000
20000
25000
30000
Series Resistor
Figure 15 – Trimming UV / OV with an external series resistor
Picor Corporation • www.picorpower.com
Switch Position
“ON” Position
“OFF” Position
Switch 1A
Switch 1B
Switch 1C
Switch 1D
Connects R1 to PWRGD2 and Vin+
Connects R2 to PWRGD1 and Vin+
Connects UV of QPI to Vin+
Connects OV of QPI to Vin+
PWRGD2 open
PWRGD1 open
UV open
OV open
Figure 16 – QPI-10-CB1 switches
QPI-10-CB1 Data Sheet Rev. 1.1 Page 6 of 7
4.585
2.435
0.000
+In
CY1
CY3
2.800
CY5
2.815
CY8
CY7
Vin+
1 2 3 4
2.250
ON
2.150
2.050
Vout+
R1
R2
+In
SW1
2.150
QPI
C2
BCM
QPI-10LZ
C1
PRM
VTM
3.200
-In
1.050
1.050
QPI / V•IChip Carrier Board
For QPI-9 or QPI-10 filter models
Reorder # QPI-xx-CB1*
* xx indicates model
E
Shield
CY9
CY10
CY4
0.385
CY2
7.950
7.200
5.600
1.500
5.100
Carrier
5/07 revB
0.250
CY6
-In
Vin-
0.400
0.250
0.000
Vout-
2.500
Vin-
0.000
8.200
Figure 17 – Mechanical drawing for QPI-10-CB1
Ordering Information
Carrier Board Part Number
Compatible V•I Chip Evaluation Boards (sold separately)*
QPI-10-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-10LZ 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-10-CB1 Data Sheet Rev. 1.1 Page 7 of 7
5/08