UEE datasheet(13/29 Pages) MURATA

13 / 29 page

www.murata-ps.com/support

UEE Series

Isolated, High-Density, Eighth-Brick

DOSA Low Proﬁle DC/DC Converters

MDC_UEE_Series.A04 Page 13 of 29

Emissions Performance, Model UEE-3.3/25-D48

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 Speciﬁcations. An external discrete ﬁlter is

installed and the circuit diagram is shown below.

[1] Conducted Emissions Parts List

[2] Conducted Emissions Test Equipment Used

Spectrum Analyzer – Hewlett Packard HP8594L

Line Impedance Stabilization Network (LISN) – 2 Line V-Networks LS1-15V,

50 Ω, 50 μH

[3] Conducted Emissions Test Results

[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 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.

Designation

Value

Part Number

Description

Vendor

1 μF

GRM32ER72A105KA01L

SMD Ceramic, 100V, 1000nF,

X7R-1210

Murata

100 nF

GRM319R72A104KA01D

SMD Ceramic, 100V, 100nF

±10%, X7R-1206

Murata

1320 μH

LB16H1324

Common Mode choke,

1320 μH, ±25%, 4A, R5K,

*21*21*12.5mm

High Light

C4, C5

0.022 μF GRM32DR73A223KW01L

SMD Ceramic, 1000V, 0.022

μF, ±10%, X7R-1210

Murata

220 μF

UHE2A221MHD

Alum. electrolytic, 100V, 220

μF, ±10%, long lead

Nichicon

Not used

Not used for this model

LOAD

External

Power

Source

DC/DC Converter

Ground

-Vsource

NEG.

LINE

POS.

LINE

Spectrum

Analyzer

Return

Figure 3. Conducted Emissions Test Circuit

Graph 3. Conducted emissions performance, Positive Line,

CISPR 22, Class A, full load

Graph 4. Conducted emissions performance, Negative Line,

CISPR 22, Class A, full load

UEE Datasheet(PDF) 13 Page - Murata Manufacturing Co., Ltd.

UEE Datasheet(HTML) 13 Page - Murata Manufacturing Co., Ltd.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Datasheet Download

Link URL