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TPS65400-Q1: Compensation circuit caluculation

Ryo Akashi
Genius 9450 points
Part Number: TPS65400-Q1

Hello experts,

I have question about Compensation Calculation.

1. Could you tell me each unit for items(F, R, C, Gm, Gmps) in equation?
2. In Figure 17, there is not Cff. C1 is Cff?


3. From user's guide Figure 2-1, the compensation circuit is not match with datasheet Figure 17.
Could you tell me how to decide compensation circuit?
If there is example of calculation, it's helpful.

Thanks and best regards,
Ryo Akashi

  • 0
    TI__Genius 15135 points

    Hi, Ryo 

    1. Fc is Hz, R is ohm, C is F, Gm and Gmps are A/V. 

    2. Yes, the C1 is Cff. 

    3. The compensation circuit is determined by loop bandwidth fc, which means compensation circuit is different when setting different fc. 

    You should set the fc first, then do the calculation based on the equations. 

    There is a calculator for your reference. 

    TPS65400_Design_Calculator.xlsx