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10.Appendix
Transition of the operating point: Overcurrent protection (OCP)
operation
We assume that OCP setting I
age of the constant voltage power supply as V
than V
V
M0
(V
segment ML (M
When point L is reached, OCP is activated. At this point, two types of operation are available
on the PLZ-5W depending on which action is set to be executed at OCP detection.
If the action set to be executed at OCP detection is Trip, load off is executed.
If the action set to be executed at OCP detection is Limit, the PLZ-5W sinks current as a con-
stant current load at point L. Even if you attempt to decrease the voltage current, the current
is limited at point L. If you increase the voltage, the OCP is cleared. The PLZ-5W returns to
CV mode and the operating point moves along segment ML.
Point L
PLZ-5W
Operating area
V
M0
M
V
M
M
1
V
M1
M
2
V
M2
V
L
L
Constant voltage line
(constant voltage setting)
I
Logarithmic scale
OCP
Input current (A)
, no current flows. When the voltage of the PLZ-5W is decreased to a point where
M
is smaller than V
, the current starts flowing. If the voltage is decreased further
M
→V
→V
) to increase the input current (load current), the operating point moves along
M1
M2
L
→M
→L).
1
2
Trip
Turns off the load (stops the current flow). The PLZ-5W no longer operates as a load.
CV mode ends. OCP continues, and the PLZ-5W sinks current as a constant current
Limit
load.
Constant current line
(OCP setting)
OCP trip po
N
I
N
is smaller than current I
OCP
. When voltage V
M
Operating Area
at point N and denote the volt-
N
of the PLZ-5W is greater
M0
117
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