Datasheet

PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
MDC_PAH-48-53Vout-450W.A10 Page 18 of 19
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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.
Reference Part Number Description Vendor
C1, C2, C7,
C9, C10
GRM32ER72A225KA35L
CAP SMT NON POL CERAMIC
X7R 2.2UF 100V 20%
1210
Murata
L1, L2
COMMON MODE-809uH-
±25%-9.7A-R5K-
28*26*12.7mm
C3, C4, C5, C6 GRM55DR72J224KW01L
SMD CERAMIC 630V-0.22uF-
±10%-X7R-2220
Murata
C8 UHE2A221MHD
Aluminum 100V-33Uf-
±10%-long lead
Nichicon
L1 C2 L2 C7
Module
C1
C5 C3 C4C6
C8C9 C10
Figure 10. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, 48 Vin, full load
[4
]
]
]
]
LaLa
La
La
y
yo
ut
ut
ut
t
R
R
R
ec
c
om
me
me
m
nd
nd
nd
d
at
at
at
t
io
io
io
ns
ns
ns
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, 48 Vin, full load