MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
APPLICATION NOTES (continued)
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor
should be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be
>20MHz.
L
Power
Source
DC
C
Load
DC
MEV3S0505SC
MEV3S0509SC
MEV3S0512SC
MEV3S0515SC
MEV3S1205SC
MEV3S1209SC
MEV3S1212SC
MEV3S1215SC
L, μH
10
22
47
47
10
22
47
47
Inductor
SMD
Through Hole
84103C
11R103C
84223C
11R223C
84473C
11R473C
84473C
11R473C
84103C
11R103C
84223C
11R223C
84473C
11R473C
84473C
11R473C
Capacitor
C, μF
4.7
2.2
1
1
4.7
2.2
1
1
EFFICIENCY VS LOAD
MEV3505xxSC Input Voltage
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
MEV3512XXSC Input Voltage
90
80
Efficiency (%)
70
60
50
40
30
20
10
0
0
10
20
30
40
50
Load (%)
60
70
80
90
100
15V
12V
9V
5V
15V
12V
9V
5V
Load (%)
www.murata-ps.com
Technical enquiries
email: mk@murata-ps.com, tel:
+44 (0)1908 615232
KDC_MEV3C.A01
Page 4 of 5
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