Delta Electronics DNL Series manual Tests and Evaluation, No Load Input Current Test

8.0Tests and Evaluation

8.1Input Characteristics

8.1.1 Input Voltage Range and Under-Voltage Lockout

The DNM04xx and DNL04xx Series of DC/DC converters will operate at full load from 2.4Vin to 5.5Vin for 5Vin (nominal) types. The DNM12xx and DNL12xx 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).

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