TPS63000: Overheating

Mark Siegesmund

Part Number: TPS63000
Other Parts Discussed in Thread: TPS63030

We are switching from a TPS63030 to TPS63000 due to part availability. The TPS63000 part seems to work for a while but it gets

very hot and will eventually fail. When it fails there is a low resistance from the Lx pins and ground. The part is powered from a USB 5V

and we adjust the output between 2V and 5V. Most testing so far has been with no load or a low load. We only need 100ma from the device.

Same schematic but we added a cap to the input to reduce noise. The PCB footprint changed for the new part. So far we blew 3 parts.

over 2 years ago

0 Tao Zhang over 2 years ago

TI__Mastermind 24605 points

Hi Mark,

you mean schamatic is same with EVM but a cap added at the output, right?

could you help to capture waveforms including VIN node L1 and Vout?

Regards

Tao

0 Mark Siegesmund over 2 years ago in reply to Tao Zhang

Prodigy 70 points

The schematic was the same with an extra 10uf ceramic cap on the input. The input had some ripple. I will attach waveforms in a day or two when I get new chips.

0 Tao Zhang over 2 years ago in reply to Mark Siegesmund

TI__Mastermind 24605 points

Hi Mark,

could you help to attach a picture of schematic?

what this link is for and i am not able to open it .

Regards

Tao

0 Mark Siegesmund over 2 years ago in reply to Tao Zhang

Prodigy 70 points

U8 is a digital pot.

0 Mark Siegesmund over 2 years ago in reply to Mark Siegesmund

Prodigy 70 points

5V in, 5V out. No load. Chip very hot.

Input, ~50mv p-p

Output: ~20mv p-p

L1:

0 Tao Zhang over 2 years ago in reply to Mark Siegesmund

TI__Mastermind 24605 points

Hi Mark,

could you help to capture a waveform including DC value of input/output and node L1 in a much longer time?

Regards

Tao

0 Mark Siegesmund over 2 years ago in reply to Tao Zhang

Prodigy 70 points

We have resolved the problem. Grounding pin 7 seems to make the chip work well. It has more noise than the TPS63030 but it does not overheat. We had been using the TPS63030 for years with PSYNC tied to Vin but for some reason the TPS63000 does not like that at least for loads under 100ma. Thanks for your interest.

0 Tao Zhang over 2 years ago in reply to Mark Siegesmund

TI__Mastermind 24605 points

Hi Mark,

thanks for your try. good news, see you next time.

Regards

Tao

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TPS63000: Overheating