NMR Series

Isolated 1W Single Output DC/DC Converters

KDC_NMR.D02 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.

DC

DC

L

C

Load

Power

Source

Inductor

Capacitor

L, μH

SMD

Through Hole

C, μF

NMR100C

10

82103C

11R103C

4.7

NMR101C

47

82473C

11R473C

1

NMR102C

47

82473C

11R473C

1

NMR106C

10

82103C

11R103C

4.7

NMR107C

47

82473C

11R473C

1

NMR108C

47

82473C

11R473C

1

NMR112C

10

82103C

11R103C

4.7

NMR113C

47

82473C

11R473C

1

NMR114C

47

82473C

11R473C

1

NMR118C

10

82103C

11R103C

4.7

NMR119C

47

82473C

11R473C

1

NMR120C

47

82473C

11R473C

1