6Tutorial
174 E364xA User’s and Service Guide
Output Characteristics
An ideal constant-voltage power supply would have a zero output impedance at
all frequencies. Thus, as shown in Figure 6-3, the voltage would remain perfectly
constant in spite of any changes in output current demanded by the load.
The ideal constant-current power supply exhibits an infinite output impedance at
all frequencies. Thus as Figure 6-4 indicates, the ideal constant-current power
supply would accommodate a load resistance change by altering its output
voltage by just the amount necessary to maintain its output current at a constant
value.
The output of the power supply can operate in either constant voltage (CV) mode
or constant-current (CC) mode. Under certain fault conditions, the power supply
cannot operate in either CV or CC mode and becomes unregulated.
Figure 6-3 Ideal constant voltage
power supply
Figure 6-4 Ideal constant current
power supply
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