Datasheet

ManualsBrandsMURATA POWER SOLUTIONS ManualsPSU ComponentsDC/DC converter (print) 15 V 133 mA 2 W No. of outputs: 1 x

MEJ2 Series

5.2kVDC Isolated 2W DC/DC Converters

KDC_MEJ2_E01 Page 4 of 7

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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 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.

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

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

Start-up time Start-up time

ms ms

MEJ2S0303SC 0.89 MEJ2S1515SC 6.05

MEJ2S0305SC 1.89 MEJ2D0503SC 1.57

MEJ2S0503SC 1.08 MEJ2D0505SC 1.79

MEJ2S0505SC 2.04 MEJ2D0509SC 9.32

MEJ2S0509SC 6.5 MEJ2D0512SC 14.9

MEJ2S0512SC 8.29 MEJ2D0515SC 20.84

MEJ2S0515SC 11.4 MEJ2D1203SC 1.03

MEJ2S1203SC 0.73 MEJ2D1205SC 2.51

MEJ2S1205SC 1.61 MEJ2D1209SC 6.46

MEJ2S1209SC 4.04 MEJ2D1212SC 9.94

MEJ2S1212SC 5.51 MEJ2D1215SC 14.54

MEJ2S1215SC 7.61 MEJ2D1505SC 1.79

MEJ2S1505SC 1.33 MEJ2D1509SC 5.16

MEJ2S1509SC 3.37 MEJ2D1512SC 7.04

MEJ2S1512SC 4.47 MEJ2D1515SC 10.48

Typical Start-Up Wave Form

OSCILLOSCOPE

Y INPUT

SUPPLY

C1 C2 C3 R1 T1

Input Output

DC/DC Converter

R LOAD