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TPS2120: TPS2120 design check

Chen Alex1
Expert 2725 points
Part Number: TPS2120

hi Sir

I  use the TPS2120 to be the power mux, some question need check

1.how about the resistance accuracy require in R71,R65

2.Could you help to check the below circuit is correct?

3.SEL can floating?

thanks

  • 0
    TI__Mastermind 20260 points

    Hi Alex,

    1. For R71, 1% tolerance will result in a 4.88-4.97A typical current limit. 1% is a good tolerance for this.
    For R65, 1% tolerance will result in a 4.85-4.93V falling limit (assuming all else is ideal). 1% tolerance is good for this, but it depends on how precise your application requires.

    2. Aside from these comments, the schematic looks ok.

    3. No, if you do not plan to use the SEL pin then you should tie it to ground.

    Thanks,

    Patrick