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MEE3 Series
1kVDC 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
DC
C
Load
Inductor
Capacitor
L, μH
SMD Through Hole
C, μF
MEE3S0505SC
MEE3S0509SC
MEE3S0512SC
MEE3S0515SC
MEE3S1205SC
MEE3S1209SC
MEE3S1212SC
MEE3S1215SC
10
22
47
47
10
22
47
47
84103C 11R103C
84223C 11R223C
84473C 11R473C
84473C 11R473C
84103C 11R103C
84223C 11R223C
84473C 11R473C
84473C 11R473C
4.7
2.2
1
1
4.7
2.2
1
1
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test con?guration.
C1
C2
C3
R1
R2
T1
RLOAD
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
than 100mΩ at 100 kHz
100nF multilayer ceramic capacitor, general purpose
450Ω resistor, carbon ?lm, ±1% tolerance
50Ω BNC termination
3T of the coax cable through a ferrite toroid
Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the speci?ed values.
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
SUPPLY
+
Input
-
+
Output
-
C1 C2 C3
R1
T1
R2
Y INPUT
R LOAD
www.murata-ps.com/support
KDC_MEE3.A03 Page 3 of 5
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