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TPS628502-Q1: schematic review

Dustin Yim
Intellectual 2740 points
Part Number: TPS628502-Q1

Tool/software:

Hi Team,

Could you please help to review this schematic?

If you need any more information, please let me know.

Sw Freq 2.25MHz

Max ambient temperature. 85 ‘C

  • 0
    TI__Mastermind 21710 points

    Hi,

    - Could you please share customer, project and application details?

    - When COMP pin is tied to Vin, the minimum effective output capacitance for Vout < 1 V should be 30uF. With the current 3*10uF, you will not satisfy this requirement. 

    3*10uF is sufficient when Rcf = 8.06k.

    Rest seems fine.

    Thanks,

    Febin

  • 0 in reply to Febin
    TI__Intellectual 2740 points

    Adding capacitor is pretty difficult for customer, so adjust RCF is proper.

    Vin=3.3V, Vout=0.907V 

    SSC enable

    Could you please calculate Rcf and SW frequency?

  • 0 in reply to Dustin Yim
    TI__Mastermind 21710 points

    Hi Dustin,

    For SSC enabled condition, the minimum effective output capacitance for Vout < 1 V should be 30uF.

    Thanks,

    Febin

  • 0 in reply to Febin
    TI__Intellectual 2740 points

    Hi Febin,

    For SSC,

    1.

    2.

     

     

    Questions

    - What is the best option (1 or 2) for 3* 10uF? Since customer dont want to add cap but want to enable SSC.

    - How about using Rcf range 10kohm ~ 15kohm?

    - Is there any other opinion for 3* 10uF and enable SSC?

  • 0 in reply to Dustin Yim
    TI__Mastermind 21710 points

    Hi Dustin,

    Dustin Yim said:
    What is the best option (1 or 2) for 3* 10uF? Since customer dont want to add cap but want to enable SSC.

    For SSC enabled config, recommendation is 30uF. 

    If the customer wants to use a lower Cout, I would suggest to confirm that loop stability and transient performance is as expected in his application.

    Dustin Yim said:
    How about using Rcf range 10kohm ~ 15kohm?

    Please use only recommended Rcf values.

    Dustin Yim said:
    Is there any other opinion for 3* 10uF and enable SSC?

    Are there any distributed capacitors on this rail?

    Thanks,

    Febin