PLZ-5W User’s Manual 151
Appendix ｜ Operating Area
Constant power (CP) mode operation
Constant power mode operation
When the PLZ-5W is used in CP mode, the PLZ-5W operates as a constant power load as shown in the
following figure. When voltage V1 of the constant-voltage power supply increases, input current I
decreases so that the power consumed by the PLZ-5W, P=V×I, is kept constant. In the following figure,
P = V
1×I1 = V2×I2.
Transition of the operating point: Overcurrent protection (OCP) operation
Example: Examining the load characteristics of the constant-voltage power supply in CP mode.
Operation on segment AB
If the voltage of the constant-voltage power supply is set to V1 and the power of the PLZ-5W is increased
(P
1 → P2 → PB) and the input current (load current) is increased, the operating point moves along seg-
ment AB (A
1 → A2 → B). When point B 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.
Operation on segment GH
If the voltage of the constant-voltage power supply is set to V3 and the power of the PLZ-5W is increased
(P
1 → P2 → PB) and the input current (load current) is increased, the operating point moves along seg-
ment GH. Point G is the maximum power at the range being used.
I
V
0
The power (P) is kept
constant even when
the current and
voltage change
PLZ-5W
Constant
voltage source
V1
Current I
Voltage V
V
2
V
1
I
1
I
2
Setting Behavior
Trip Turns off the load (stops the current flow).
Limit PLZ-5W sinks current as a constant current load at point B. Even if you attempt to increase the input
current, the current is limited at point B. If you decrease the input current, the OCP is cleared. The
PLZ-5W returns to CP mode and the operating point moves along segment AB.
Input current (A)
Input voltage [V]
Logarithmic scale
Constant power line
(OCP setting)
Constant current line
Operating area
OCP trip point
(Constant power settings: P1, P2, PB)
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