Delta Electronics S48SS manual Soft Start Turn-On Time

8.3.2 Soft Start Turn-On Time

Soft Start Turn-On Time is defined as the time it takes for the output to rise to within 95% of its final value from the time when the converter is enabled. The rise time is deliberately made slower to reduce the inrush current and to eliminate any overshoot in the output voltage.

Test -S48SR & S48SS ( turn on the module by using the input power supply)

1)Turn on the fan.

2)Set the enable switch SW1 to the appropriate logic enable position (S48SS only).

3)Turn on the input Power Supply and set it to the desired operating point.

4)Set the input Power Supply disable by an external switch or use the input Power Supply internal disable function.

5)Set Channel 1 on the oscilloscope to be DC coupled and to 1V/Div.

6)Connect a coaxial cable from Channel 1 to BNC2 on the Evaluation Board.

7)Set Channel 2 on the oscilloscope to be DC coupled and to 20V/Div.

8)Connect a coaxial cable from Channel 2 to BNC1 on the Evaluation Board.

9)Set the Timebase to 10 mS/Div.

10)Set the Trigger for a one time event and set the Trigger level at approximately 2V on Channel 1.

11)Enable the input Power Supply to supply power and record the waveforms on the oscilloscope.

Test-S48SS (turn on the module by using the Remote on/off feature)

1)Turn on the fan.

2)Set the enable switch SW1 to the appropriate logic disable position.

3)Turn on the input Power Supply and set the input voltage to the desired operating point.

4)Set Channel 1 on the oscilloscope to be DC coupled and to 1V/Div.

5)Connect a coaxial cable from Channel 1 to BNC2 on the Evaluation Board.

6)Set Channel 2 on the oscilloscope to be DC coupled and to 2V/Div.

7)Set the Timebase to 10 mS/Div.

8)Set the Trigger for a one time event and set the Trigger level to approximately 2V on Channel 2.

9)Connect the 10X probe (Channel 2) to the “ON/OFF” test point on the evaluation board and connect the ground clip to the “Vin –“ pin on the evaluation board.

10)Set the enable switch SW1 to the appropriate logic position to enable power and record the waveforms on the oscilloscope.

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