Datasheet

ManualsBrandsMURATA POWER SOLUTIONS ManualsPSU ComponentsDC/DC converter (print) 3.3 V 4.5 A 14.85 W No. of outputs: 1 x

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UEI15 Series

Isolated Wide Input Range 15-Watt DC/DC Converters

MDC_UEI15W.C14 Page 16 of 17

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

Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC

Rohde & Schwarz Software ESPC-1 Ver. 2.20

HP11947A Transient Limiter (Agilent)

OHMITE 25W – Resistor combinations

DC Source Power Supply – Kikisui Model PAD 55-6L

[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

L2 PE-62913 1mH, 6A Pulse

L1 500uH,10A, MPS 500uH,10A Murata

C1 Ceramic 2.2ufd, 100V Murata

C2 Electrolytic Capacitor 33ufd, 100V Panasonic

Graph 1. Conducted emissions performance,

CISPR/EN55022, Class B, full load, ﬁ ltered

Graph 1. Conducted emissions performance,

CISPR/EN55022, Class B, full load, unﬁ ltered

Figure 8. Conducted Emissions Test Circuit

UEI15-050-Q12P-C EMI 15W Test Card

24Vdc in, 5Vout, 3Amps

V+

V-

Black

Vin - Vout -

Vout +Vin +

Resistive

Load

UUT

C1C1C1C1 C1C1 C2C1C1C1

Resistive

Load

inside a

metal

container