MEE1 Series

Isolated 1W Single Output DC/DC Converters

KDC_MEE1.C01 Page 5 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 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 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

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