TPS7A03: no output after ESD testing

Kailun Liu

Intellectual 2583 points

Part Number: TPS7A03
Other Parts Discussed in Thread: STRIKE

Tool/software:

Hi team,

My customer test their product ESD ability with 15kV, after the test they find TPS7A0328 has no output.

Removed the IC and soldered to another board and found that TPS7A0328 was normal again. Can you help to analyze it?

3 months ago

0 Hannah Grace 3 months ago

TI__Genius 15125 points

Hello,

How are they testing for ESD?

Does this happen every time they test this?

Best,

Hannah

0 Kailun Liu 3 months ago in reply to Hannah Grace

TI__Intellectual 2583 points

Hi Hannah,

Yes, for ESD test, 3/3 times. It is very curious it can recover after power on reset.

0 Hannah Grace 3 months ago in reply to Kailun Liu

TI__Genius 15125 points

Yes, it is. I would assume if it was an issue with ESD the device would just become damaged fully and be unable to recover, but that does not seem to be the case here. Do you know how they are testing for ESD?

After the strike, did they run the device for an extended period of time? Are they sure the circuitry connecting to the LDO was not damaged and the LDO was actually, okay?

Do you have a schematic of their board?

Best,

Hannah

0 Kailun Liu 3 months ago in reply to Hannah Grace

TI__Intellectual 2583 points

Hi Hannah,

I am working on to have their SCH for analyze. A quick question is : is that possible caused by foldback current limit or thermal protection?

0 Hannah Grace 3 months ago in reply to Kailun Liu

TI__Genius 15125 points

Yes, I think this could be possible. Were the customers able to test the circuitry connecting to the device for damage?

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TPS7A03: no output after ESD testing