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NMH Series
Isolated 2W Dual Output DC/DC Converters
APPLICATION NOTES (continued)
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test con?guration.
C1
C2
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
C3 100nF multilayer ceramic capacitor, general purpose
R1 450Ω resistor, carbon ?lm, ±1% tolerance
R2 50Ω BNC termination
T1 3T of the coax cable through a ferrite toroid
RLOAD 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
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: Ceramic chip capacitors are recommended. It is required that the ESR (Equivalent Series Resistance) should be as low as possible, X7R 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
Order Code
NMH0505XC
NMH0509XC
L (μH)
47
47
Inductor Order Codes
SMD Through Hole
82473C 11R473C
82473C 11R473C
C (μF)
4.7
2.2
NMH0512XC
NMH0515XC
NMH1205XC
NMH1209XC
NMH1212XC
NMH1215XC
NMH2405XC
NMH2409XC
NMH2412XC
NMH2415XC
NMH4805XC
NMH4809XC
NMH4812XC
NMH4815XC
150
100
47
47
150
100
47
47
150
100
47
47
150
100
82154C 11R154C
82104C 11R104C
82473C 11R473C
82473C 11R473C
82154C 11R154C
82104C 11R104C
82473C 11R473C
82473C 11R473C
82154C 11R154C
82104C 11R104C
82473C 11R473C
82473C 11R473C
82154C 11R154C
82104C 11R104C
3.3
3.3
4.7
2.2
3.3
3.3
4.7
2.2
3.3
3.3
4.7
2.2
3.3
3.3
Product speci?cation for MPS inductors can be found at:
1100R Series (Through Hole)
http://www.murata-ps.com/data/magnetics/kmp_1100r.pdf
8200 Series (SMD)
http://www.murata-ps.com/data/magnetics/kmp_8200c.pdf
www.murata-ps.com/support
KDC_NMH.F01 Page 4 of 6
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