MEJ1S0303SC Datasheet, PDF (4/9 Pages) –

MEJ1 Series
5.2kVDC Isolated 1W 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.
MEJ1S0303SC
MEJ1S0305SC
MEJ1S0503SC
MEJ1S0505SC
MEJ1S0509SC
MEJ1S0512SC
MEJ1S0515SC
MEJ1S1203SC
MEJ1S1205SC
MEJ1S1209SC
MEJ1S1212SC
MEJ1S1215SC
MEJ1S1505SC
MEJ1S1509SC
MEJ1S1512SC
MEJ1S1515SC
MEJ1S2405SC
MEJ1S2409SC
MEJ1S2412SC
MEJ1S2415SC
Start-up time
μs
900
2000
500
2000
3200
7500
10500
600
1200
2900
2900
3900
1100
2400
2700
3800
1700
2300
2200
3600
MEJ1D0503SC
MEJ1D0505SC
MEJ1D0509SC
MEJ1D0512SC
MEJ1D0515SC
MEJ1D1203SC
MEJ1D1205SC
MEJ1D1209SC
MEJ1D1212SC
MEJ1D1215SC
MEJ1D1505SC
MEJ1D1509SC
MEJ1D1512SC
MEJ1D1515SC
MEJ1D2405SC
MEJ1D2409SC
MEJ1D2412SC
MEJ1D2415SC
Start-up time
μs
700
1600
3700
4200
7000
600
1200
3600
3900
6000
1200
3200
3300
4800
1100
2000
3300
6400
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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KDC_MEJ1C.A01 Page 4 of 9