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Input Protection Current line
50 mA
Source Voltage line
I
meter
Load line with
15 mA
R = 1 kΩ
I
=
meter
= 15 V / 1 kΩ
= 15 mA
(A) Normal source voltage mode operation
Figure 2-6 Source voltage operation
In
to a 1 kΩ load and it is measuring 15 mA. As long as the DUT load line
intersects the source voltage line, it will be in source voltage mode and
the voltage will maintain at 15 V. However in
when the resistance of the load decreases to 100 Ω, the load line
intersects the input protection current line. This forces the
U2722A/U2723A to go into source current mode. Since the input
protection current setting is set at 50 mA and the U2722A/U2723A cannot
operate out of the boundary, the voltage changes to 5 V instead.
U2722A/U2723A User's Guide
V
15 V
source
V
/ R
source
Figure 2- 6
(A), the U2722A/U2723A is having a source voltage of 15 V
Operation and Features
Input Protection Current line
50 mA
Source Voltage line
I
meter
Load line with R = 100 Ω
5 V
V
source
(B) Crossover to source current mode operation
Figure 2- 6
15 V
V
source
× R
I
=
meter
= 50 mA × 100 Ω
= 5 V
(B), it shows that
2
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