Datasheet

NXE1 Series
Isolated 1W Single Output SM DC/DC Converters
KDC_NXE1.E01 Page 5 of 8
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APPLICATION NOTES
Short Circuit Performance
Advisory Notes Minimum Load
The NXE1 series is not hermetically sealed, customers should ensure that parts
are fully dried before input power application.
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 & 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.
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended. The voltage rating should be at least
twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor should
be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be >20MHz.
DC
DC
L
C
Load
Power
Source
Inductor Capacitor
L, µH SMD Through Hole C, µF
NXE1S0303MC
15 82153C 11R153C 10
NXE1S0305MC 22 82223C 11R223C 4.7
NXE1S0505MC
22 82223C 11R223C 4.7
Start-up time
µS
NXE1S0303MC 150
NXE1S0305MC 400
NXE1S0505MC 250
Typical Start-Up Wave Form
NXE1 series offers short circuit protection which is continious with nominal input voltage at low ambient temperatures. At higher ambient temperatures of 65 °C and
above short circuit duration will be limited.