Instruction manual

19
When the resistor’s value decreases so the output current value becomes equal
to the current limit value, power supply will go to constant current operation
(see third row of the table).
If the resistor value is R = 1 Ù, for U
out
= 5V, using Ohm’s law the output
current is 5A. But this value is greater than current limit value, so the power
supply limits the output current to the limit programmed value. That is why in
the third row of the table I
out
= 2 A. In this case, U
out
is changed, too. Using
Ohm’s law again, the output voltage is calculated using output current value
and the resistor value, so it is 2 V.
So the power supply will go to constant current operation when the output
current value becomes equal or greater than the limit value.
When the output current value becomes smaller than the limit value (by
changing resistor’s value), the power supply will go back to constant voltage
operation.
In conclusion:
CV: U
out
= U
lim
and I
out
< I
lim
CC: U
out
< U
lim
and I
out
= I
lim
The following section will explain how to get the power supply in constant
current operation mode and in constant voltage operation mode.