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Power Supply Function

The heavy solid line illustrates the locus of possible operating points as a func-

tion of output. As shown by the horizontal portion of the line, the output voltage

remains regulated at its programmed setting as long as the load current remains

within the positive or negative current limit setting. A CV status flag indicates

that the output voltage is being regulated and the output current is within its limit

settings.

Note that when the output current reaches either the positive or negative current

limit, the unit no longer operates in constant voltage mode and the output volt-

age is no longer held constant. Instead, the unit will now regulate the output cur-

rent at its current limit setting.

As shown by the vertical portions of the shaded quadrants, the output voltage

may continue to increase in the positive direction or decrease in the negative di-

rection as current is forced into or pulled out of the unit. When the output voltage

exceeds the over-voltage protection setting, the output will shut down.

CC Priority

In CC priority mode, the output is controlled by a bi-polar constant current feed-

back loop, which maintains the output source or sink current at its programmed

setting. The output current remains at its programmed setting, provided the load

voltage remains within the voltage limit setting. CC priority mode is best suited

for use with batteries, power supplies, large charged capacitors, and loads that

are sensitive to current overshoots. It minimizes current overshoots during pro-

gramming, turn-on, and turn-off transitions and seamlessly transitions between

positive and negative currents.

In CC priority mode, the output current should be programmed to the desired

positive or negative value. A positive voltage limit range should also be set. The

voltage upper limit should always be set to a value that is greater than the actual

input voltage requirement of the external load. The following figure shows the

CC priority operating locus of the output. The area in the white quadrants shows

the output as a source (sourcing power). The area in the shaded quadrants

shows the output as a load (sinking power).

ITech IT6000C Series User Manual

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