Hey,
I recently tested the TPS26633 on the TPS2663-166 EVM. Part is in latch mode, and I shorted the reverse protection circuitry (i.e. shorted R1) as we will do in application.
I've found that when the efuse is on and I load the input of the efuse, the fault pin becomes active but the efuse keeps running. I presume this is because the efuse shortly detected a reverse current from the output elco to the input load. However, why does the red led stay on when the load remains on? I would assume it disappears after the reverse current disappears, which should be almost instantaneously.
Moreover, the fault remains active even when removing the load, though this is timing dependent. If the load was on for more than approx. one second, the fault goes off. Otherwise, it stays on. Why does this happen?
This happens irregardless of the mode pin of the efuse.
During all this the output voltage remains stable, so that's good. However, this makes the fault pin not really usable as an indicator of whether the efuse is active.
Any way to solve or alleviate this bug in the fault indicator?
