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TPS2121: About recommended settings.

Kengo.Y
Guru 11225 points
Part Number: TPS2121

Hi team,

I would like to switch between 5V and 12V.
I want to set the priority input to 5V or 12V depending on the application.
Could you tell me how to configure the circuit to change the resistor to 5V or 12V priority?

Sincerely.
Kengo.

  • +1
    TI__Genius 16085 points

    Hi Kengo, 

    How the TPS2121 works is it will set priority to one supply when you put the device in XCOMP mode as shown in the output source selection table in the datasheet and below: 

    That priority is determined using voltage divider resistors at PR1 and CP2. Once PR1 and CP2 voltages cross, the device switches over. 

    I have put together an excel sheet I've attached which allows you to manipulate those resistor dividers to see how the device reacts. 

    If you have any further questions, please let me know. 

    Best Regards, 

    Elizabeth 3173.TPS2121 PR1 CP2 Calc E2E.xlsx