MEJ2 Datasheet, PDF (4/7 Pages) Murata Manufacturing Co., Ltd. – 5.2kVDC Isolated 2W DC/DC Converters

MEJ2 Series
5.2kVDC Isolated 2W DC/DC Converters
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.
MEJ2S0303SC
MEJ2S0305SC
MEJ2S0503SC
MEJ2S0505SC
MEJ2S0509SC
MEJ2S0512SC
MEJ2S0515SC
MEJ2S1203SC
MEJ2S1205SC
MEJ2S1209SC
MEJ2S1212SC
MEJ2S1215SC
MEJ2S1505SC
MEJ2S1509SC
MEJ2S1512SC
Start-up time
ms
0.89
1.89
1.08
2.04
6.5
8.29
11.4
0.73
1.61
4.04
5.51
7.61
1.33
3.37
4.47
MEJ2S1515SC
MEJ2D0503SC
MEJ2D0505SC
MEJ2D0509SC
MEJ2D0512SC
MEJ2D0515SC
MEJ2D1203SC
MEJ2D1205SC
MEJ2D1209SC
MEJ2D1212SC
MEJ2D1215SC
MEJ2D1505SC
MEJ2D1509SC
MEJ2D1512SC
MEJ2D1515SC
Start-up time
ms
6.05
1.57
1.79
9.32
14.9
20.84
1.03
2.51
6.46
9.94
14.54
1.79
5.16
7.04
10.48
Typical Start-Up Wave Form
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer 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 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±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 specified values.
Differential Mode Noise Test Schematic
SUPPLY
DC/DC Converter
++
Input Output
--
C1 C2 C3 R1
OSCILLOSCOPE
T1
R2
Y INPUT
R LOAD
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