MEE1 Series
Isolated 1W Single Output DC/DC Converters
KDC_MEE1.C03 Page 5 of 13
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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 1.25 times 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.
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
+
+
-
-
Start-up time Start-up time
µs µs
MEE1S0303XC 355 MEE1S1209XC 818
MEE1S0305XC 622 MEE1S1212XC 1285
MEE1S0309XC 1542 MEE1S1215XC 2052
MEE1S0312XC 2410 MEE1S1505XC 260
MEE1S0315XC 3346 MEE1S1509XC 642
MEE1S0503XC 334 MEE1S1512XC 993
MEE1S0505XC 402 MEE1S1515XC 1574
MEE1S0509XC 1316 MEE1S2405XC 221
MEE1S0512XC 1776 MEE1S2409XC 541
MEE1S0515XC 2232 MEE1S2412XC 860
MEE1S1205XC 285 MEE1S2415XC 1049