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NMG Series
Isolated 2W Single Output DC/DC Converters
APPLICATION NOTES
Minimum load
The minimum load to meet datasheet speci?cation is 10% of the full rated load across the speci?ed input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically double the speci?ed output voltage if the output load falls to less than 5%.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product
series will start into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF.
Start-up time
μs
Start-up time
μs
Typical Start-Up Wave Form
NMG0505SC
NMG0509SC
NMG0512SC
NMG0515SC
NMG1205SC
NMG1209SC
NMG1212SC
NMG1215SC
NMG0524SC
NMG1224SC
444
1120
1930
3470
409
1320
1320
2270
2200
1400
NMG1505SC
NMG1509SC
NMG1512SC
NMG1515SC
NMG2405SC
NMG2409SC
NMG2412SC
NMG2415SC
100
170
300
450
80
130
220
330
Ripple & Noise Characterisation Method
All measurement to be taken with the following components connected to the UUT as detailed below. 50 Ohm coax cable, solder connections one end, BNC plug at
the other end.
C1
C2
C3
R1
R2
T1
RLOAD
1μF X7R multilayer ceramic capacitor rated at minimum 3 x the output voltage of the UUT
10μF tantalum capacitor rated at minimum 1.5 x the output voltage of the UUT with ESR of less than 100 milliohms at 100 kHz e.g. AVX TPS
series.
100nF multilayer ceramic capacitor, general purpose
450 Ohm resistor, carbon ?lm, ±1%
50 Ohm BNC termination
3T of the coax cable through a ferrite toroid eg Ferroxcube TN32/19/13-3E25
Resistive load at the UUT maximum rating. Connections 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_NMG.E01 Page 4 of 7
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