UEI30 Series
30W Isolated Wide-Range DC-DC Converters
dBμV
80
70
60
50
40
30
20
10
0
-10
-20
CONAV
dBμV
80
70
60
50
40
30
20
10
0
-10
-20
CONAV
0.15
1.0
10.0
30.0
0.15
1.0
10.0
30.0
MHz
Graph 2. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, 5.43A @ 48Vin, for UEI30-050-Q48N-C
MHz
Graph 5. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-150-Q12N-C
dBμV
80
70
60
50
40
30
20
10
0
-10
-20
CONAV
dBμV
90
80
70
60
50
40
30
20
10
0
-10
CONAV
0.15
1.0
10.0
30.0
0.15
1.0
10.0
30.0
MHz
Graph 3. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-120-Q12N-C
MHz
Graph 6. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-150-Q48N-C
dBμV
80
70
60
50
40
30
20
10
0
-10
CONAV
[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.
Since many factors affect both the amplitude and spectra of emissions, we
-20
0.15
1.0
10.0
30.0
recommend using an engineer who is experienced at emissions suppression.
MHz
Graph 4. Conducted emissions performance with ?lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-120-Q48N-C
www.murata-ps.com/support
MDC_UEI Series 30W.B01 Page 17 of 18
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