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6
8.0 Tests and Evaluation
8.1 Input Characteristics
8.1.1 Input Voltage Range and Under-Voltage Lockout
The DNS04xx Series of DC/DC converters will operate at full load from 2.4Vin to 5.5Vin for
5Vin (nominal) types. The DNS12xx Series DC/DC converters will operate at full load from
10Vin to 14Vin for 12Vin (nominal) types. The converters feature input under-voltage
protection, which will not allow the converter to start up unless the input voltage exceeds the
turn-on voltage threshold.
Test
1) Turn on the fan.
2) Set the input voltage to the desired operating point while monitoring DVM2.
3) Set the switch SW2 to the “ON or OFF” position to enable the converter. (See Item
7.1.5)
4) Test the input under voltage function while observing DVM2, DVM3 and channel 1 of the
oscilloscope. Increase the input voltage until the output of the converter reaches the
appropriate value. This will occur between 2.05 and 2.25 volts for 5Vin nominal and
between 9.0 to 10 volts for 12Vin nominal. Please refer to the appropriate converter data
sheet for the detailed specification.
8.1.2 No Load Input Current Test
1) Turn on the fan.
2) Set the input voltage to the desired operating point while monitoring DVM2.
3) Set the switch SW2 to the converter ON.
4) Remove/disable the output electronic load or resistive load.
5) Note the input current from DVM1.
6) The result is the No-Load Input current of the DC/DC converter.
The No-Load Input Current will be around 50 to 150 mA depending on the model under
evaluation. (Please refer to the data sheet for the detailed specification).