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2
Operation and Features
Input Protection Voltage line
15 V
Load line with R = 500 Ω
10 V
V
meter
V
meter
(A) Normal source current mode operation
Figure 2-8 Source current operation
In
mA to a 500 Ω load and it is measuring 10 V. As long as the DUT load
line intersects the source current line, it will be in source current mode
and the current will maintain at 20 mA. However in
shows that when the resistance of the DUT increases to 1 kΩ , the DUT
load line intersects the input protection voltage line. This forces the
U2722A/U2723A to go into source voltage mode. Since the voltage setting
is clamped at 15 V and the U2722A/U2723A cannot operate out of the
boundary, the current then changes to 15 mA instead.
38
Source Current
line
I
20 mA
source
× R
= I
source
= 20 mA × 500 Ω
= 10 V
Figure 2- 8
(A), the U2722A/U2723A is having a source current of 20
Input Protection Voltage line
15 V
Load line with
R = 1 k Ω
V
meter
Source Current line
I
source
I
source
(B) Crossover to source current mode operation
U2722A/U2723A User's Guide
20 mA
15 mA
= V
/ R
meter
= 15 V / 1 kΩ
= 15 mA
Figure 2- 8
(B), it
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