Datasheet

www.murata-ps.com/support
UEE 150W Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE 150W_Series.A02 Page 23 of 35
Emissions Performance, Model UEE-12/12.5-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 Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[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
[3] Conducted Emissions Test Results
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi 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.
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
L1 1320 µH LB16H1324
Common Mode choke,
1320 µH, ±25%, 4A, R5K,
*21*21*12.5mm
High Light
C4, C5 0.022 µF GRM32DR73A223KW01L
SMD Ceramic, 1000V, 0.022
µF, ±10%, X7R-1210
Murata
C3 220 µF UHE2A221MHD
Alum. electrolytic, 100V, 220
µF, ±10%, long lead
Nichicon
C6 Not used Not used for this model
C1
L1
C2 C3
C4 C5
DC/DC
C6
++
-48V
RTN
GND
VCC
GND
Load
Figure 4. Conducted Emissions Test Circuit
Graph 5. Conducted emissions performance, Positive Line,
CISPR 22, Class A, 48 Vin, full load
Graph 6. Conducted emissions performance, Negative Line,
CISPR 22, Class A, 48 Vin, full load