How to Characterize Power Supply Current Limits

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ATE DC Electronic Load
+ ATE DC Electronic Load
ATE DC Electronic Load
+ ATE DC Electronic Load

Characterize Current Limit Behavior

Characterizing power supply current limiting requires progressively increasing the load while monitoring the resulting output voltage and current. The setup includes a programmable DC electronic load connected to the power supply under test, with voltage and current measurements recorded throughout the load sweep. The test begins with a relatively high load resistance so the supply operates in constant-voltage (CV) mode while drawing minimal current. The electronic load then reduces the resistance in controlled steps, increasing the output current while the supply voltage is measured at each operating point.

As the load resistance decreases, the power supply eventually reaches its programmed current limit and transitions from constant-voltage operation into current-limiting behavior. The measured voltage-current data identifies the crossover region and shows how the supply regulates after reaching the current limit. A sharp crossover indicates a more defined transition into constant-current (CC) operation, while the shape of the voltage-current characteristic reveals the supply’s current-limiting behavior. Repeating the resistance sweep under controlled conditions provides a consistent method for characterizing the crossover point and current regulation across the required operating range.

Power Supply Current Limit Test Solution

Characterizing current-limit behavior requires a programmable electronic load that can progressively increase the load on the power supply while measuring the resulting voltage and current. The solution uses the Keysight ATE DC electronic load to control the load condition and capture voltage and current measurements as the operating point moves from constant-voltage operation toward current limiting. Its integrated measurement capability provides the measured electrical values needed to identify the crossover region without requiring a separate external meter for the load measurement path. The load can be programmed for controlled resistance changes so the current increases in defined steps while the power supply output is monitored. This provides repeatable voltage-current characterization of the supply’s transition into current-limited operation and supports automated evaluation of current regulation across defined operating conditions.
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See Block Diagram of Power Supply Current Limit Test Solution

See Block Diagram of Power Supply Current Limit Test Solution

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