MGJ6 Three Phase Bridge Series
5.7kVDC 6W Quad Output Isolated Gate Drive SM DC/DC Converters
KDC_MGJ6C-3P.A02 Page 6 of 12
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EMC FILTERING AND SPECTRA
FILTERING
MGJ6Q05P24MC MGJ6Q12P24MC
MGJ6Q24P24MC
C1, C2 & C3 Polyester or ceramic capacitor
C4 Electrolytic capacitor (note R1 could be omitted if C4 has ESR >= R1)
DC
DC
L1
+VIN
-VIN
C1
C4
C3
C2
R1
+VOUT
-VOUT
0
10
20
30
40
50
60
70
80
90
100
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
0
10
20
30
40
50
60
70
80
90
100
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
The following filter circuit and filter table shows the input filters typically required to meet EN 55022 Curve B, Quasi-Peak EMC limit, as shown in the following plots. The
following plots show positive and negative quasi peak and CISPR22 Average Limit B (purple line) and Quasi Peak Limit B (pink line) adherence limits.
TO MEET CURVE B
Part Number C1 L1 Part Number C2 C3 R1 C4
MGJ6Q05P24MC
MGJ6Q12P24MC 10µF 1mH 51105C 1nF 1nF 1
Ω 470µF
MGJ6Q24P24MC 10µF 1mH 51105C 1nF 1nF 1
Ω 470µF