MEV1 Series
3kVDC Isolated 1W Single & Dual Output 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.
Start-up time
μs
Start-up time
μs
Typical Start-Up Wave Form
MEV1x0505xC
MEV1x0509xC
MEV1x0512xC
MEV1x0515xC
MEV1x1205xC
MEV1x1209xC
MEV1x1212xC
MEV1x1215xC
MEV1x1505xC
MEV1x1509xC
585
MEV1x1512xC
MEV1x1515xC
MEV1x2405xC
MEV1x2409xC
MEV1x2412xC
MEV1x2415xC
MEV1x4805SC
MEV1x4809SC
MEV1x4812SC
MEV1x4815SC
3045
4445
440
1550
2700
4320
605
4355
1855
2930
580
1750
3000
4800
660
1320
2075
3235
1720
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
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 100mꢀ at 100 kHz
C3
R1
100nF multilayer ceramic capacitor, general purpose
450ꢀ resistor, carbon film, 1% tolerance
R2
50ꢀ 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
DC/DC Converter
OSCILLOSCOPE
Y INPUT
R2
C1 C2 C3
R1
T1
+
+
Input
Output
SUPPLY
-
-
R LOAD
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2011-05-09 KDC_MEV1.F01 Page 5 of 10
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