TPS65131: Improve load transient repsonse

Hi,

May I have a look at your schematic? You can send it to me through private message if you have confidential concern.

BR

Patrick

Already sent the schematic to you.

Hi Lyn,

OK, what is the slew rate of the loading and is it able for you to control the slew rate of the 100mA load? I can help to test with the same configuration with our EVM to see if we can have any improvement as well.

And may I have a look at the -12V waveforms when adding more output caps and adjusting the feedforward network (C4057 and R4041)? Thanks

BR

Patrick

Hi Patrick,

Yes,we can control the slew rate and we used the fastest setting-0.4A/us in the measurement.

Some waveforms for your reference as followings,our target is <100mV,the best result we can get is around 300+mV,that's why I said we failed to improve.

Hi Lyn,

Did you try the slower slew rate of the loading?

And you can try with smaller resistance of R4041 to increase the response speed.

BR

Patrick

Hi Patrick,

We tried slower rate even if the lowest one-0.0001A/us,and smaller R4041(10K which is the smallest value from datasheet),the best result we can get is around 300+mV.How about your EVM?

Hi Lyn,

I will give you update later.