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TPS65131-Q1 inrush current issue

Other Parts Discussed in Thread: TPS65131-Q1

Hola,

We met inrush current problem with using TPS65131-Q1 as panel application and the schematic shown as below:

If we give the output current with heave load and the pattern will shows unstable as below figure:

If we change C305 from 6.8pF as 22pF and it will improve the inrush current problem shown as below figure:

Is this way make sense to improve inrush current?

In addition, we heard a high frequency noise with this application, should I decreasing the inductor's value for this issue or is there any way to improve the

high frequency noise?

Thank you very much

  • Hi Jacky Chen2,

    The reason for high frequency noise can be poor layout design. The FBx and Cx- Pins are highly sensitive and if the capacitances are not placed closely to the Pins they can function as an antenna and in turn induce noise.
    Can you send me your layout as well?

    Thank you,

    Best Regards,

    Ilona