TPS54260 have hot-plug issue on our system

gary hung

Other Parts Discussed in Thread: TPS54260

When I plug cable in system,That will 36V input to TPS54260 Vin pin but the same time Vout keep 10ms 36V also then will output 12V normal.

Is it correct? That will burn our system

Please advise.

Thanks

BR,

Gary Hung

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

It is not unusual to have problems with hot plugging. I don't recall seeing this before though. can you post your schematic/

0 gary hung over 8 years ago in reply to JohnTucker

Prodigy 40 points

Attached schematic

0 JohnTucker over 8 years ago in reply to gary hung

TI__Guru**** 191445 points

I'm not seeing anything obvious. Can you post your start up waveform again including the PH node and VIN? Zoom in on the rising edge of Vout when it jumps to 36 V

0 gary hung over 8 years ago in reply to JohnTucker

Prodigy 40 points

Hi:

So far I can't duplicate this issue again.

I think maybe IC damage or SMT issue.

Did you have any comment?

Thanks~

BR.

Gary Hung

0 JohnTucker over 8 years ago in reply to gary hung

TI__Guru**** 191445 points

It is always possible you have had a one - of failure. If you can duplicate it, please post your waveforms.

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TPS54260 have hot-plug issue on our system