Tutorial 6
Output Characteristics
E364xA User’s and Service Guide 159
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 this power supply can operate in either the
constant voltage (CV) mode or constant current (CC) mode.
Under certain fault conditions, the power supply can not
operate in either the CV or CC mode and becomes
unregulated.
Figure 6- 5 shows the operating modes of the output of this
power supply. The operating point of one supply will be
either above or below the line R
L
= R
C
. This line represents a
load where the output voltage and the output current are
equal to the voltage and current settings. When the load R
L
is greater than R
C
, the output voltage will dominate since
the current will be less than the current setting. The power
supply is said to be in the constant voltage mode. The load
at point 1 has a relatively high resistance value (compared
to R
C
), the output voltage is at the voltage setting, and the
output current is less than the current setting. In this case,
the power supply is in the constant voltage mode and the
current setting acts as a current limit.
Figure 6-5 Output characteristics
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