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TPS65988: IBIS Simulation for power bank application

Prabhu Selvaraj
Intellectual 305 points
Part Number: TPS65988
Other Parts Discussed in Thread: TPS25750, BQ25731, BQ4050

Hi,

We already had a look at TPS25750, But had a strong idea on building a power bank application with TPS65988 with DRP, PD, 2 x USB C ports features.

In our design we have used other Integrated chips: BQ4050 and BQ25731, which do not have any simulation models.

I would prefer to simulate circuit before implementing it in a PCB. But, only an IBIS model is available for TPS65988.

  1. What are all the behaviors that can be simulated with this IBIS model related to the power bank application ?
  2. Which are all the necessary behaviors that cannot be simulated with this IBIS model related to the power bank application ?

 

Thank you

  • 0
    TI__Mastermind 32661 points

    The challenge of simulating chargers or switching converters is that IBIS models are not very accurate, so many customers do not utilize them. 

    I agree that the TPS65988 is a good choice for a power bank with the features that you are describing.

    The best option for simulation using an IBIS model is going to be the power loss of the system.  The issue that you will face is that this is a very dynamic system where signaling between chips is not very will covered with simulation.

    This will be a very difficult system to simulate.  The best suggestion I have is a careful schematic review.  I am able to offer schematic review for you via private message so that your information is not shared on a public forum.  

  • 0 in reply to Chuck Branch
    Intellectual 305 points

    Hi sir,

    Here with, I've attached the power bank schematic for the review. 

    PowerBank_sch.pdf

    Thank you

  • 0 in reply to Prabhu Selvaraj
    TI__Mastermind 32661 points

    Prabhu,

    These elements will allow you to implement a power bank and control the BQ25731.  The TPS65988 can be configured to configure the BQ25731 appropriately.

    The PQ4050 will have to manage charge termination.

    The next steps will be to read through the App notes for the TPS65988 to review how to configure and control the BQ25731.

    Regards,

    Chuck