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TPS61378-Q1: Compensation and Calculator inputs when using fixed output

David Shumate
Expert 8065 points
Part Number: TPS61378-Q1


Hi Team,

When using a 5V0 fixed output by tying a 0ohm resistor to ground per datasheet:

What Rbottom/Rtop should be used for plugging into the design calculator? Typing in 0ohm gives a flat bode plot.

Thanks!

David

Best,

David

  • 0
    TI__Genius 16405 points

    Hi David, 

    Sorry the calculator is not so intelligent to distinguish that Rdown=0 means output fixed 5V.

    0ohm feedback resistor will cause calculate error.

    You can fill the box with 1k, and don't remember to set the output to be 5V.

    Also, Cff cannot be a number other than 0, due to the inner feedback circuit.

    the calculator will give the right result.

    Best Regards

    Fergus