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PDF QPI-21 Data sheet ( Hoja de datos )

Número de pieza QPI-21
Descripción Active EMI Input Module
Fabricantes Picor 
Logotipo Picor Logotipo



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No Preview Available ! QPI-21 Hoja de datos, Descripción, Manual

Active EMI Input Module for 48 Vdc Bus
Quiet-Power®
QPI-21
S
C NRTL US
Product Description
The QPI-21 active EMI filter attenuates conducted common-
mode (CM) and differential-mode (DM) noise over the
CISPR22 frequency range of 150 kHz to 30 MHz. The product
is designed for use in 48 Vdc bus (36 – 76 Vdc) systems, with
100 Vdc surge capability. The QPI-21’s 14 A rating supports
multiple DC-DC converter loads up to an ambient
temperature of 65°C without de-rating. Designed for the
telecom and ITE bus range, the QPI-21 supports the PICMG®
3.0 specification for filtering system boards to the EN55022
Class B limits.
In comparison to passive solutions, the use of active filtering
reduces component size and therefore reduces the overall
package size. The Picor QPI-21 smaller size saves valuable
board real estate and the reduced height enhances airflow.
The QPI-21 is available as a lidded or an open-frame SiP
(System-in-Package) module with LGA mounting. Evaluation
boards are available to allow for quick in-circuit testing of the
QPI-21LZ within an existing system design.
Features
45 dB CM attenuation at 250 KHz (50 Ω)
80 dB DM attenuation at 250 KHz (50 Ω)
80 Vdc (max input)
100 Vdc surge 100 ms
1,500 Vdc hipot hold off to shield plane
14 A rating
25.3 x 25.3 x 5.0 mm Lidded SiP (System-in-Package)
24.9 x 24.9 x 4.4 mm Open-frame SiP
Low profile LGA package
-40° to +125°C Ambient temperature (see Figure 14)
Efficiency >99%
Connect in series for higher attenuation
Pads for additional X filtering capacitance
cTÜVus approved to UL/CSA 60950-1 and EN 60950-1
CE marked to the LVD and RoHS Recast Directive
as applicable
QuietPower®
QPI-21LZ
U.S. PATENT NO. 6,898,092
Figure 1 — QPI-21LZ (~1 in2 area)
Typical Applications
Applications
ATCA blades
Telecom base stations
IBA & distributed power
Network switches and routers
Optical line-cards
TD-SCMA wireless infrastructure
CX1
BUS+
CB1
BUS-
Chassis/Shield
XY+
BUS+
XY-
QPI+
BUS-
QPI-
Shield
CY1
IN+
CIN
PC
PR
OUT+
SENSE+
SC
SENSE-
IN-
CY2
OUT-
CY3
Shield Plane
LOAD
CY4
Figure 2 — Typical QPI-21 circuit with a Vicor brick converter. Optional X (CX1) filter capacitor shown.[b]
[b] CB1, CX1 capacitors, referenced in all schematics, are a 47uF electrolytic; United Chemi-Con EMVE101ARA470MKE0S or equivalent.
Quiet-Power®
Page 1 of 15
Rev 1.5
08/2015
vicorpower.com
800 927.9474

1 page




QPI-21 pdf
Figure 4 — An unfiltered converter’s response to “open-frame”
(light blue) and “base-plate” (purple) EMI configurations
There are two basic topologies for the connection of the re-
circulating “Y” capacitors, referred to as “open-frame” and “base-
plate”. Figure 4 illustrates how a converters total conducted noise
QPI-21
profile can vary with one topology versus another. The EMI
generated by the “base-plate” configuration is much greater than that
generated by the “open-frame” in this example. Selecting the right
topology will greatly reduce the amount of EMI signal that needs to
be filtered.
Figure 2 shows the base-plate topology of re-circulating “Y”
capacitors. Here, CY1 to CY4 are connected to each power node of
the dc-dc converter, and then are connected together on a copper
shield plane created under the converter. The addition of the copper
shield plane helps in the containment of the radiated EMI,
converting it back to conducted EMI and shunting it back to
its source.
In Figure 5, the open-frame topology is shown where the “Y”
capacitors (CY1 and CY2) re-circulate the EMI signals between the
positive input and output, and the negative input and output nodes
of the power conversion stage. Safety and system requirements may
dictate that some converters must have the output return (-) directly
connected to earth ground. This connection can impact performance
of some filter solutions, where the QPI-21 works well in this
configuration.
BUS+
+
CB1
BUS-
XY+ XY-
BUS+
QPI+
BUS-
QPI-
Shield
+
CIN
C Y2
IN+ OUT+
SENSE+
PC
SC
PR
SENSE-
IN- OUT-
LOAD
Chassis/Shield
Optional Chassis Connection
C Y1
Figure 5 — Typical “open-frame" application with an optional connection of the chassis to OUT- of the converter
Quiet-Power®
Page 5 of 15
Rev 1.5
08/2015
vicorpower.com
800 927.9474

5 Page





QPI-21 arduino
QPI Insertion Loss Test Circuits
QPI-21
V BUS
BUS
IN
LISN
C hassis SIG
BUS
IN
LISN
C hassis SIG
47uF
BUS+
QPI+
QPI-21
BUS-
QPI-
Shield
IPRO BE
LO A D C S IG
50 Ω
IPRO BE
INA
INB
SIG
Figure 18 — Test Set-up to measure Differential Mode EMI currents in Figure 17.
V BUS
BUS
IN
LISN
C hassis SIG
BUS
IN
LISN
C hassis SIG
47uF
BUS+
QPI+
QPI-21
BUS-
QPI-
Shield
LO A D
IPRO BE
C SIG
50 Ω
IPRO BE
INA
INB
SIG
Figure 19 — Test Set-up to measure Common Mode EMI currents in Figure 17.
Quiet-Power®
Page 11 of 15
Rev 1.5
08/2015
vicorpower.com
800 927.9474

11 Page







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