Priority Mode Tutorial
Keysight MP4362A power modules have a fixed sinking current limit of 0.5 A. They
also have a rectangular output characteristic. Refer to Output Quadrants for details.
Voltage Priority
In voltage priority mode, the output is controlled by a constant-voltage feedback loop, which
maintains the output voltage at its programmed setting as long as the load current remains within the
positive or negative current limit settings. Voltage priority mode is best suited for use with resistive or
high impedance loads, and loads that are sensitive to voltage overshoots. Do not use voltage priority
mode with low-impedance sources such as batteries, power supplies, or large charged capacitors.
In voltage priority mode, the output voltage should be programmed to the desired value. A positive and
negative current limit value should also be set. The current limit should always be set to a value that is
greater than the actual output current requirement of the external load. The following figure shows the
voltage priority operating locus of the output. The area in the white quadrants shows the output as a
source (sourcing power). The shaded quadrants show the output as a load (sinking power).
The heavy solid line illustrates the locus of possible operating points as a function of the output load.
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
(constant voltage) status indicates that the output voltage is being regulated and the output current is
within its limit settings.
Note that when the output current reaches the positive or negative current limit, the unit no longer
operates in constant voltage mode and the output voltage is no longer held constant. Instead, the
power supply will now regulate the output current at its current limit setting. A LIM+ (positive current
limit), or LIM– (negative current limit) status is set to indicate that a current limit has been reached.
These conditions are annunciated by CL+ or CL- on the front panel.
Keysight MP4300 Series Operating and Service Guide 73
4 Using the Modular Power System
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