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TPS2121: Can the reverse polarity protection be simulated using PSpice for TI software?

user6091384
Prodigy 120 points
Part Number: TPS2121

Tool/software:

Hi Team,

1. Can the reverse polarity protection be simulated using PSpice for TI software? 

2. Also, We checked the RPP with a diode. 

Vin = 3.765V

Output voltage = -2.61V

But it should be 0V if we added a diode as in the datasheet section:10.6 Reverse Polarity Protection with TPS212x right? Please correct me if I am wrong. 

  • 0
    TI__Mastermind 34935 points

    Niju,

    The PSPICE model likely has an issue which would cause the RPP not to be modeled 100% compared to silicon. For #2, did you check this on an EVM or the existing PSPICE mode? It is recommended to test on the EVM itself to get the most accurate results. 

    Best Regards,
    Tim 

  • 0 in reply to Timothy Logan
    Prodigy 120 points

    Hi Timothy, 

    Thanks for the reply. 
    1. As I understand EVM doesn’t have the RPP feature. There is no diode or GND separation. Could you please confirm?

    2. We checked in Spice model, there we didn’t see any difference in output voltage if we reversed the input voltage. In both cases, there are only a few microvolts.  I will share the graphs layer. 

  • +1 in reply to user6091384
    TI__Mastermind 34935 points

    Hello,

    I confirmed that the RPP was not implemented in the PSPICE model. The EVM does not have a way of isolating the ground and modifications would have to be made to support this. 

    The diode on the ground pin simply blocks current from flowing from ground to VIN when the ground potential is less than VIN. Make sure when choosing the diode that the reverse breakdown voltage is over what the nominal supply voltage is.

    Best Regards,
    Tim

  • 0 in reply to Timothy Logan
    Prodigy 120 points

    Hi Timothy,

    Thanks for the reply. I hope with the right Diode RPP will work.

    I have one more question,

    I am using TSP2121. So, for RPP do we need to connect the CP2 pin's GND to the device GND? 

  • 0 in reply to user6091384
    Prodigy 120 points

    Hi Timothy,

    We are getting -0.5V output while we reverse the reverse the battery power. I think RPP is working fine. 

    Thanks for the support.