TEXIO PDS20-10A - Page 44

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Turning the output on when CC priority mode is selected
The PDS-A power series is a switching-type DC stabilized power supply unit. A switching-type CV/CC power supply
unit consists of circuit in which transition from constant-voltage (CV) mode to constant-current (CC) mode, and vice
versa, is slower than the CV/CC power supply unit of the CV series regulator type.
Because of the slow transition from constant-voltage (CV) mode to constant-current (CC) mode, and vice versa,
voltage/current overshoot is generated in the switching-type CV/CC power supply unit when the output is turned on.
If it is determined beforehand that the loads connected to the unit are controlled in CV mode or CC mode, the
voltage/current overshoot generated while output is on can be eliminated by using CC priority mode.
The following are the output voltage and current waveforms, according to the status of CC priority mode, while the
output is on.
CC mode priority function
Output voltage waveform for when a
load causes the unit to operate in CV
mode
Output current waveform for when a
load causes the unit to operate in
CC mode
OFF
Almost no overshoot in the
output voltage.
An overshoot of approx. 10% of
the rated current is generated in the
output current.
ON
An overshoot may be generated
in the output voltage.
Almost no overshoot in the
output current.
The above voltage and current waveforms assume that the resistance is the load of this unit.
If other loads are used for resistance, the voltage and current waveforms may differ from those shown above.