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UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Pro?le DC-DC Converters
Emissions Performance, Model UEE-3.3/15-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Speci?cations. An external discrete ?lter is
installed and the circuit diagram is shown below.
Return
L1
[3] Conducted Emissions Test Results
External
DC
+
+
Power
Source
C1
C2
C3
C6
LOAD
-Vsource
Graph 1. Conducted emissions performance, Positive Line,
NEG.
LINE
POS.
LINE
C4
C5
Ground
DC/DC Converter
CISPR 22, Class A, full load
Spectrum
Analyzer
Figure 2. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Designation Value
Part Number
Description
Vendor
C1
1 μF
GRM32ER72A105KA01L
SMD Ceramic, 100V, 1000nF,
X7R-1210
Murata
C2
100 nF GRM319R72A104KA01D
SMD Ceramic, 100V, 100nF
±10%, X7R-1206
Murata
Common Mode choke,
L1
1320 μH LB16H1324
1320 μH, ±25%, 4A, R5K,
High Light
*21*21*12.5mm
C4, C5
C3
0.022 μF GRM32DR73A223KW01L
220 μF UHE2A221MHD
SMD Ceramic, 1000V, 0.022
μF, ±10%, X7R-1210
Alum. electrolytic, 100V, 220
μF, ±10%, long lead
Murata
Nichicon
C6
Not used Not used for this model
[2] Conducted Emissions Test Equipment Used
Spectrum Analyzer – Hewlett Packard HP8594L
Line Impedance Stabilization Network (LISN) – 2 Line V-Networks LS1-15V,
50 Ω, 50 μH
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class A, full load
[4] Layout Recommendations
Most applications can use the ?ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional ?lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
MDC_UEE_Series.C01 Page 7 of 29
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