Datasheet

NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
KDC_NMJ.G06 Page 3 of 6
www.murata-ps.com/support
APPLICATION NOTES
Minimum load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically double the specified 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 Start-up time
µs µs
NMJ0505SC 2530 NMJ0505SAC 1059
NMJ0509SC 7865 NMJ0509SAC 3454
NMJ0512SC 13080 NMJ0512SAC 7980
NMJ0515SC 21560 NMJ0515SAC 11505
NMJ1205SC 2770 NMJ1205SAC 1286
NMJ1209SC 20455 NMJ1209SAC 3548
NMJ1212SC 14475 NMJ1212SAC 7355
NMJ1215SC 22300 NMJ1215SAC 11535
NMJ0303SAC 530
NMJ0503SAC 576
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1 1µF X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2
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 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon film, ±1% tolerance
R2 50 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 specified values.
Differential Mode Noise Test Schematic
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1
R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
Typical Start-Up Wave Form