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Chapter 7 Tutorial
Output Characteristics
150
Figure 7-5 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 setting. When the load R
L
is greater than R
C
,
the output voltage will dominate since the current will be less then the current
setting. The power supply is said to be in 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 7-5. Output Characteristics
When the load R
L
is less than R
C
, the output current will dominate since the
voltage will be less than the set voltage. The power supply is said to be in
constant current mode. The load at point 2 has a relatively low resistance, the
output voltage is less than the voltage setting, the output current is at the
current setting. The supply is in constant current mode and the voltage setting
acts as a voltage limit.