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5
5) SW2 is used to enable or disable the converter.
For positive logic module, When SW2 is put in the ON position, the converter is ON and
when SW2 is put in the OFF position, the converter is OFF.
For negative logic module, When SW2 is put in the OFF position, the converter is ON, and
when SW2 is put in the ON position, the converter is OFF.
6) SW3 is used for the Output Voltage Set-Point Adjustment Range.
By an external voltage source:
If the converter requires a trim up, set the SW3_1 to ON position.
If the converter requires a trim down, set the SW3_2 to ON position.
By an external resistor:
If the converter requires a trim up to Vo,set, set the SW3_8 to ON position.
If the converter requires a margin trim down, set the SW3_3 to ON position.
If the converter requires a margin trim up, set the SW3_4 to ON position.
Please refer to the SW3 Function table.
SW3 Function table
Subdivide switch No. Function
SW3_1 Voltage trim up
SW3_2 Voltage trim down
SW3_3 Resistor margin trim down
SW3_4 Resistor margin trim up
SW3_8 Resistor trim up
Note:
1. The subdivide switch of SW3_1~4 must not be ON at the same time.
2. For the SW3_5~7 use at NPA series, must set to OFF position.
7.2 Initial Power Up
1) Turn the power supply ON, set the current limit on DC source (refer to specification of
either converter) and increase the input voltage (use DVM2 to monitor the input voltage)
until it reaches the desired value.
2) Set the switch SW2 to power module ON.
3) The converter is now operating, which can be verified by observing the DVM3 (appropriate
value for the nominal output voltage) and channel 2 of the oscilloscope (appropriate value
for the nominal output voltage).
4) Set the switch SW2 to power module OFF.