TPS82130: PG ripple

Naizeng Wang

Part Number: TPS82130

Hi team,

Below is the schematic of TPS82130. The PG is pulled up to Vout 1.05V by 10k resistor. When the output voltage is 1.05V, PG is also 1.05V. But the PG ripple is obviously higher than Vout ripple. Could you please find the reason?

over 1 year ago

0 Colin Chen over 1 year ago

TI__Mastermind 21031 points

Hi Naizeng,

It may be related to layout and test point. Usually the PG is indicator and it is ok to have a bit larger ripple.

For improvements, using a 1k resistor can be tried.

Thanks

Colin

0 Naizeng Wang over 1 year ago in reply to Colin Chen

TI__Expert 5380 points

Hi Colin,

Can you test both PG waveform and Vout waveform on EVM to see if there is still same problem?

Nison

0 Colin Chen over 1 year ago in reply to Naizeng Wang

TI__Mastermind 21031 points

Hi Naizeng,

EVM don't have such problem.

I suggest you can use a probe with ground leads to test again.

Usually it doesn't matter with a bit higher ripple on PG because it just a indicator pin.

Thanks

Colin

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TPS82130: PG ripple