UEI25 查看數據表（PDF） - Murata Manufacturing
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UEI25 Datasheet PDF : 23 Pages
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UEI25 Series
Single Output Isolated 25-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 Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
DC Source V+
Black
V-
C1
L1
Test Card
L2
C2
C4
UUT
C3 Vin+
Vout+
Vin-
Vout-
Resistive Load
Resistive Load
inside a metal
container
C6
C5
Figure 7. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
L1
L2
C1, C2
C3
C4, C5
C6
Part Number
PE-62913
NC
VZ Series
VZ Series
Unknown
VZ Series
Description
1mH, 6A
4.7uH, 3.6A
Electrolytic Capacitor 22ufd, 100V
Qty 2 - Electrolytic Capacitor 22ufd, 100V
3.3nF, 1500V
Electrolytic Capacitor 22ufd, 100V
Vendor
Pulse
Murata
Panasonic
Panasonic
Unknown
Panasonic
[2] Conducted Emissions Test Equipment Used
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
OHMITE 25W – 1 Ohm resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
[3] Conducted Emissions Test Results
dBμV
QP
AV
100
90
80
70
60
50
40
30
20
10
0
0.15
1.0
10.0
30.0
MHz
Graph 1. Conducted emissions performance with filter, Negative Line, CISPR 22, Class B,
full load, for UEI25-033-D48PM-C
dBμV
QP
AV
100
90
80
70
60
50
40
30
20
10
0
0.15
1.0
10.0
30.0
MHz
Graph 2. Conducted emissions performance with filter, Negative Line, CISPR 22, Class B,
full load, for UEI25-050-D48NM-C
dBμV
QP
Average
100
90
80
70
60
50
40
30
20
10
0
0.15
1.0
10.0
30.0
MHz
Graph 3. Conducted emissions performance without filter, Negative Line, CISPR 22, Class
B, full load, for UEI25-050-D48NM-C
dBμV
QP
AV
100
90
80
70
60
50
40
30
20
10
0
0.15
1.0
10.0
30.0
MHz
Graph 4. Conducted emissions performance with filter, Negative Line, CISPR 22, Class B,
full load, for UEI25-120-D48P-C
[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 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
MDC_UEI25W.B03 Page 22 of 23
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