TPS62130 output voltage linear rise over temperature

Marcus Simons

Other Parts Discussed in Thread: TPS62130

Hi folks,

I have a straight forward design with the TPS62130 using 2 resistors as a feedback to get 5V2 at the output. The design needs to be very compact, and therefore we expected temperature rise during usage. Our customer gave us feedback that the output voltage could go up 0,3V more than the 5V2 we aimed for. Testing here in our lab we saw this too: Cold spray let it drop in voltage, the feedback point is going from 0,77V to 0,82V depending on the temperature. We see that It does not look stable over temperature. The temperature in our tests goes from 15 deg. celcius to approx 75 deg. celcius.

Question: Is this a known issue?

If yes, then I know I have to fiddle a dirty solution...

over 9 years ago

0 Chris Glaser over 9 years ago

TI__Guru*** 145770 points

This should not be occurring. What value FB resistors did you use? Can you post your board layout?

You can test on the EVM to evaluate a known good layout.

0 Marcus Simons over 9 years ago in reply to Chris Glaser

Prodigy 40 points

Strange.. I have 4 boards which of 1 has this issue. The others are fine. There is no clue to be found why this particular device is behaving like this. Maybe too hot soldering? (prototype phase, no professional soldering profile has been used)

Is it known that devices (and their voltage references) can go wrong if soldered too hot for too long time? Then I have a clue and all is clear.

Thanks,

Marcus

0 Chris Glaser over 9 years ago in reply to Marcus Simons

TI__Guru*** 145770 points

Yes, this points to something in manufacturing. I recommend replacing the FB resistors. We've all damaged stuff through soldering at one point or another.

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TPS62130 output voltage linear rise over temperature