A-NXT-1W
Series
Application Notes
Minimum load
The minimum load to meet data sheet 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
A0303NXT
A0305NXT
A0309NXT
A0312NXT
A0315NXT
A0503NXT
A0505NXT
A0305NXT
1630
1359
3435
6590
25340
1599
2185
1395
A0509NXT
A0512NXT
A0515NXT
A1205NXT
A1209NXT
A1212NXT
A1215NXT
Start-up time
μs
6850
11560
15640
1154
4050
7995
11200
Ripple & Noise Characterization Method
Ripple and noise measurements are performed with the following test configuration.
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
R1
R2
T1
RLOAD
100nF multilayer ceramic capacitor, general purpose
450Ω resistor, carbon fi lm,
±1%
tolerance
50Ω BNC termination
3T of the coax cable through a ferrite toroid
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
Technical Enquiries-Email:tech@microdc.cn Tel:0086-20-86000646
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