QPI‐21
14A Active EMI Filter SIP for 48 Vdc Bus
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 14A 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.
Features:
45 dB CM attenuation at 250 KHz (50Ω)
80 dB DM attenuation at 250 KHz (50Ω)
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 11)
Efficiency >99%
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 in
blade applications.
Connect in series for higher attenuation
Pads for additional X filtering capacitance
TÜV Certification (1)
Note 1: Certification is in process. Use of the CE mark for graphical purposes
The QPI‐21 is available as a
lidded or an open‐frame SiP
(System‐in‐Package)
only in Figure 1
Applications
with
LGA mounting. Evaluation
boards are available to allow
for quick in‐circuit testing of
the QPI‐21LZ within an
ATCA blades
Telecom base stations
IBA & distributed power
Network switches and routers
Optical line‐cards
Figure 1 ‐ QPI‐21LZ
(~1 in2 area)
existing
system
design.
TD‐SCMA wireless infrastructure
Typical Application:
CX1
XY+
XY-
BUS+
BUS-
BUS+
QPI+
IN+
OUT+
SENSE+
SC
CIN
CY2
CB1
PC
PR
BUS-
LOAD
QPI-
SENSE-
OUT-
Shield
IN-
CY1
CY3
CY4
Chassis/Shield
Shield Plane
Figure 2 – Typical QPI‐21 circuit with a Vicor brick converter. Optional X (CX1) filter capacitor shown. (2)
Note 2: CB1, CX1 capacitors, referenced in all schematics, are a 47uF electrolytic; United Chemi‐Con EMVE101ARA470MKE0S or equivalent.
CY1 to CY4, referenced in all schematics, are 4.7nF hi‐voltage safety capacitors; Vishay VY1472M63Y5UQ63V0 or equivalent.
CIN is the converter manufacturer’s recommended value for input capacitor.
Picor Corporation ∙ picorpower.com
QPI‐21
Preliminary
Rev 1.3, Page 1 of 13