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NKA Series
Isolated Sub-Miniature 1W Dual Output DC/DC Converters
APPLICATION NOTES
Minimum load
The minimum load to meet datasheet speci?cation is 10% of the full rated load across the speci?ed input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically double the speci?ed 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
ms
Start-up time
ms
Typical Start-Up Wave Form
NKA0303SC
NKA0305SC
NKA0309SC
NKA0312SC
NKA0315SC
NKA0503SC
NKA0505SC
NKA0505SEC
1.35
3.35
9.30
22.13
25.04
0.80
2.32
2.03
NKA0509SC
NKA0512SC
NKA0515SC
NKA1205SC
NKA1209SC
NKA1212SC
NKA1215SC
8.01
14.63
28.38
2.11
7.62
9.08
14.39
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test con?guration.
C1
C2
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
than 100mΩ at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450Ω resistor, carbon ?lm, ±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 speci?ed values.
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
SUPPLY
+
Input
-
+
Output
-
C1 C2 C3
R1
T1
R2
Y INPUT
R LOAD
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KDC_NKA.J02 Page 4 of 7
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