Datasheet

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UEI30 Series
30W Isolated Wide-Range DC-DC Converters
MDC_UEI Series 30W.B02 Page 17 of 18
[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.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Graph 3. Conducted emissions performance with fi lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-120-Q12N-C
dBμV
80
-20
-10
0
10
20
30
40
50
60
70
MHz
30.00.15 1.0 10.0
CONAV
Graph 6. Conducted emissions performance with fi lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-150-Q48N-C
dBμV
90
-10
0
10
20
30
40
50
60
70
80
MHz
30.00.15 1.0 10.0
CONAV
Graph 2. Conducted emissions performance with fi lter, Negative Line, CISPR 22,
Class B, 5.43A @ 48Vin, for UEI30-050-Q48N-C
dBμV
80
-20
-10
0
10
20
30
40
50
60
70
MHz
30.00.15 1.0 10.0
CONAV
Graph 5. Conducted emissions performance with fi lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-150-Q12N-C
dBμV
80
-20
-10
0
10
20
30
40
50
60
70
MHz
30.00.15 1.0 10.0
CONAV
Graph 4. Conducted emissions performance with fi lter, Negative Line, CISPR 22,
Class B, full load, for UEI30-120-Q48N-C
dBμV
80
-20
-10
0
10
20
30
40
50
60
70
MHz
30.00.15 1.0 10.0
CONAV