Hi,
We have a circuit implemented as follows:
The current limit for a single output should be 1A nominal, 1.15A max for this circuit. I've been testing with various high power resistive loads under two different loading conditions: the switch is either enabled with the load attached or the load is attached after the switch has been enabled. With a nominal load of 18 ohms and after enabling the switch with the load attached, the output current limits to 0.96A at 18.3V with the fault pin going low until thermal shutdown occurs (as expected). With the same 18 ohm nominal load and with the load attached after enabling the switch, the output sources 1.23A at 23.4V with the fault pin staying high. This was replicated on a similar circuit with both outputs tied together for a combined maximum current limit of 3.06A, but currents as high as 3.34A were observed again with no fault indicator.
How is it that these test conditions are resulting in current levels that exceed the part's specified +/-15% tolerances for the current limit?
Thanks,
Nick Medor
