DRQ-12-50-L48 Datasheet, PDF (25/26 Pages) Murata Power Solutions Inc. – 600W Digital Fully Regulated Intermediate DC-DC Bus Converter

DRQ-12/50-L48 Series
Emissions Performance
Murata Power Solutions measures its products for conducted 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 Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
600W Digital Fully Regulated
Intermediate DC-DC Bus Converter
[3] Conducted Emissions Test Results
RTN
L1
L2
C1 C2 C3
C4 C5
-48V
C8 C9 C10 C11
+
C6 C7
DC/DC
VCC
+
C12
LOAD
GND
GND
Figure 7. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
C1, C2, C3, C4, C5
C6
L1, L2
C8, C9, C10, C11
C7
C12
Part Number
Description
GRM32ER72A105KA01L
SMD CERAMIC-100V-
1000nF-X7R-1210
GRM319R72A104KA01D
SMD CERAMIC100V-100nF-
±10%-X7R-1206
PG0060T
COMMON MODE-473uH-
±25%-14A
GRM55DR72J224KW01L
SMD CERAMIC630V-0.22uF-
±10%-X7R-2220
UHE2A221MHD
Aluminum100V-220Uf-
±10%-long lead
NA
Vendor
Murata
Murata
Pulse
Murata
Nichicon
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, full load
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, full load
[4] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter 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 GEAN-02 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.
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MDC_DRQ-12/50-L48NK.B02 Page 25 of 26