Hi Oba,
Typically when a device has a Foldback current limiting feature, it is highlighted in the data sheet with multiple plots. In the absence of those plots, Brick-wall current limiting is assumed.
As for the device dropping current from 154mA to 113mA, for a foldback current limiting device, the short circuit current is much lower than the maximum output current.
For this device:
The current limit can be triggered anywhere from 51mA to 200mA.
So either:
1. After the current limit was triggered, it dropped down to it's typ. current limit value for this input voltage.
or
2. The part was in current limit for too long, and it triggered a thermal shutdown, where the output could have cycled on and off.
Does the customer have a scope shot of the output current?
This App note titled Know Your Limits describes current limit on page 2 and 3 and the distinction between the 2 types.
Best,
Juliette
