NKE0505DC データシートの表示（PDF） - Murata Power Solutions
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NKE0505DC Datasheet PDF : 7 Pages
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NKE Series
Isolated Sub-Miniature 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.
NKE0303SC
NKE0305SC
NKE0309SC
NKE0503SC
NKE0505SC
NKE0505SEC
NKE0509SC
Start-up time
μs
544
1306
5250
496
1075
894
3140
NKE0512SC
NKE0515SC
NKE1205SC
NKE1209SC
NKE1212SC
NKE1215SC
Start-up time
μs
5040
9940
1671
2835
5295
8475
Typical Start-Up Wave Form
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
SUPPLY
DC/DC Converter
++
Input Output
--
C1 C2 C3 R1
OSCILLOSCOPE
T1
R2
Y INPUT
R LOAD
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KDC_NKE.K08 Page 4 of 7
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