Datasheet

RBE-12/20-D48 Series
Eighth-Brick 240-Watt Isolated DC/DC Converters
MDC_RBE-12-20-D48.B05Δ Page 15 of 16
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Emissions Performance
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
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
2Line V-networks LS1-15V 50 /50Uh Line Impedance Stabilization Network
[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.
Item Reference Description
1 C1, C7
SMD -100V-1000nF-
X7R-1210
2C2
SMD -100V-100nF-±10%-
X7R-1206
3L1
-809uH-±25%-9.7A-R5K-
28*26*12.7mm
4 C4, C5
0.1U/250V,
13*12*6-0.6-10mm
5C6 4700 µF
6C3 220 µF
C1
L1
C2 C3
C4 C5
DC/DC
C6
++
VCC
RTN
-48V
GND
GND
C7
Figure 5. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class A, full load
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class A, full load