MGJ1 Series
5.7kVDC Isolated 1W SM Gate Drive DC/DC Converters
KDC_MGJ1_A05 Page 15 of 18
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EMC FILTERING AND SPECTRA
FILTERING
An input capacitor and inductor is 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 (green line) and Quasi Peak Limit B (pink line) adherence limits. The recommended input capacitor to use for this circuit
is 10µF/50V. The recommended Murata part is GRM32ER71H106KA12Z.
MGJ1D051505MPC MGJ1D051510MPC
MGJ1D051905MPC MGJ1D121505MPC
DC
DC
L
C
Load
Power
Source
0
10
20
30
40
50
60
70
80
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
0
10
20
30
40
50
60
70
80
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
Inductor Capacitor
L, µH SMD Through Hole C, µF
MGJ1D051505MPC 15 46153C 13R153C 10
MGJ1D051510MPC 15 46153C 13R153C 10
MGJ1D051905MPC 15 46153C 13R153C 10
MGJ1D121505MPC 10 46103C 13R103C 10
MGJ1D121509MPC 10 46103C 13R103C 10
MGJ1D121905MPC 10 46103C 13R103C 10
MGJ1D151505MPC 10 46103C 13R103C 10
MGJ1D151509MPC 10 46103C 13R103C 10
MGJ1D151905MPC
10 46103C 13R103C 10
MGJ1D241505MPC
10 46103C 13R103C 10
MGJ1D241509MPC 10 46103C 13R103C 10
MGJ1D241905MPC 10 46103C 13R103C 10
0
10
20
30
40
50
60
70
80
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
0
10
20
30
40
50
60
70
80
1.00E+05 1.00E+06 1.00E+07 1.00E+08
dBuV
Frequency (Hz)
