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TPS60301: About an upper limit level of “CxF”

Hide
Guru 21045 points
Part Number: TPS60301

Hi Team,

 

Our customer would like to know about an upper limit level of “CxF”.

We understand that the recommended value of CxF is 1uF(typ).

If they use CxF=10uF, is there any concern?

 

[My understanding]

If CxF is larger than 1uF (for example, CxF is 10uF), the number of times of the switching necessary to reach the target output voltage decreases.

So, I understand that this operation does not have any problem.

Is my understanding correct?

 

[Background]

They investigate whether they can reduce the switching noise* by making CxF big.

* They use the spectrum analyzer to observe this noise.

 

Regards,

Kanemaru

  • 0
    Guru 21045 points

    Hi Team,

    I am sorry for bothering you again.

    Would you tell me about the progress on this matter?

    I would appreciate your prompt reply.

    Regards,

    Kanemaru

  • 0 in reply to Hide
    TI__Guru* 78430 points
    Hi Kanemaru-san,
    Sorry for the delay. Higher capacitors are not recommended because it will increase the time constant of charging time, which may cause the capacitors under charged and hence not able to establish the output regulation. Please stay with the 1uF as recommended in the datasheet.

    Thanks,
    Youhao Xi, System and Applications Engineering, APP-BMC-BCS, TI
  • 0 in reply to Youhao Xi
    Guru 21045 points

    Hi Youhao Xi-san,

     

    Thank you for the information.

    I understand. Thank you very much.

     

    Regards,

    Kanemaru