MER1 Series
1kVDC Isolated 1W Single 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
600
1730
3780
6700
750
2605
3754
5280
704
1859
Start-up time
μs
3375
5090
431
245
1634
2682
512
1432
2528
3884
Typical Start-Up Wave Form
MER1S0505SC
MER1S0509SC
MER1S0512SC
MER1S0515SC
MER1S1205SC
MER1S1209SC
MER1S1212SC
MER1S1215SC
MER1S1505SC
MER1S1509SC
MER1S1512SC
MER1S1515SC
MER1S2405SC
MER1S2409SC
MER1S2412SC
MER1S2415SC
MER1S4805SC
MER1S4809SC
MER1S4812SC
MER1S4815SC
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
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
C2
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
DC/DC Converter
OSCILLOSCOPE
C1 C2 C3
+
SUPPLY
Input
R1
T1
R2
Y INPUT
+
Output
-
-
R LOAD
www.murata-ps.com
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
2009/09/15
KDC_MER1.A01
Page 3 of 6
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