Datasheet

MEF1 Series
Isolated 1W Regulated Single Output DC/DC Converters
KDC_MEF1.C02 Page 4 of 7
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APPLICATION NOTES
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
µs
MEF1S0303SPC 310
MEF1S0305SPC 550
MEF1S0503SPC 225
MEF1S0505SPC 460
MEF1S1203SPC 185
MEF1S1205SPC 390
MEF1S2403SPC 160
MEF1S2405SPC 430
MEF1S0303SP3C 310
MEF1S0305SP3C 550
MEF1S0503SP3C 225
MEF1S0505SP3C 460
MEF1S1203SP3C 185
MEF1S1205SP3C 390
MEF1S2403SP3C 160
MEF1S2405SP3C 430
MEF1S0305SP3C