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UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
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 Speci?cations. An external discrete ?lter is
installed and the circuit diagram is shown below.
[3] Conducted Emissions Test Results
V+
UEI15-050-Q12P-C EMI 15W Test Card
24Vdc in, 5Vout, 3Amps
UUT
Resistive
Load
Black
C1
C1
C1
C1
C1
C1
C1
C1
Vin +
Vout +
C1
C2
Resistive
Load
L1
L2
inside a
metal
container
V-
Vin -
Vout -
Graph 1. Conducted emissions performance,
CISPR/EN55022, Class B, full load, ?ltered
Figure 8. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
L2
L1
C1
C2
Part Number
PE-62913
500uH,10A, MPS
Description
1mH, 6A
500uH,10A
Ceramic 2.2ufd, 100V
Electrolytic Capacitor 33ufd, 100V
Vendor
Pulse
Murata
Murata
Panasonic
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
HP11947A Transient Limiter (Agilent)
OHMITE 25W – Resistor combinations
Graph 1. Conducted emissions performance,
CISPR/EN55022, Class B, full load, un?ltered
DC Source Power Supply – Kikisui Model PAD 55-6L
[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_UEI15W.C14 Page 16 of 17
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