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TPS25980: TPS259804 Short-circuit experiments show inconsistent performance

Part Number: TPS25980

Hi team,

My customer use 7 TPS259804 in their board, with the same external circuits.

However, when they did the short-circuit experiments, the TPS259804 performs differently.

Three can directly protect during the short-circuit test, and four cannot protect directly, they did the protection actions after several us.

The related waveforms are attached.

The first result is based on the normal three. Under open load test (0A) and under 5.2A load test, the chip can both do the protection action.

The second result is based on the abnormal four. Under open load test (0A), the chip can protect at once, and under 5.2A load test, the chip cannot protect immediately.

The schematic is given following, all these seven are the same schematic.

0160.Schematic.pdf

I need your team to help point out the possible reason that can cause this phenomenon.

Thanks for your time and effort.

Best Regards,

Matt.