MEV3 Series

3kVDC Isolated 3W Single Output DC/DC Converters

KDC_MEV3C.A01 Page 4 of 5

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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.

EFFICIENCY VS LOAD

MEV3505xxSC Input Voltage

MEV3512XXSC Input Voltage

DC

DC

L

C

Load

Power

Source

0

10

20

30

40

50

60

70

80

90

0

102030405060708090

100

Load (%)

5V

9V

12V

15V

0

10

20

30

40

50

60

70

80

90

0

10

203040

50607080

90

100

Load (%)

5V

9V

12V

15V

Inductor

Capacitor

L, μH

SMD

Through Hole

C, μF

MEV3S0505SC

10

84103C

11R103C

4.7

MEV3S0509SC

22

84223C

11R223C

2.2

MEV3S0512SC

47

84473C

11R473C

1

MEV3S0515SC

47

84473C

11R473C

1

MEV3S1205SC

10

84103C

11R103C

4.7

MEV3S1209SC

22

84223C

11R223C

2.2

MEV3S1212SC

47

84473C

11R473C

1

MEV3S1215SC

47

84473C

11R473C

1