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BQ25713: Bode plot / gain-phase margin

Victor Hansen
Prodigy 60 points

Part Number: BQ25713
Other Parts Discussed in Thread: TIGER

Hi TI forum.

I am currently in the process of debugging a prototype that uses this charger IC.

The circuit in my prototype follows the reference design rather closely and especially for the two compensation filter pins. However, in my debug process, I was wondering what the gain and phase margin of the reference design is? I can't seem to find any documentation of this or how to tune the compensation pins should I need to do so.

I have attempted to follow the suggestions proposed in this thread, https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/794533/bq25713-how-to-measure-bode-plot
but I am uncertain of my results, hence why I would like to see what the reference design would look like.

Thanks in advance.

Kind regards,
Victor

  • 0
    TI__Mastermind 38245 points

    Hi, Victor,

    There are multiple loops inside the charger, for example, input voltage, input current, system voltage, charge current, charge voltage etc. To simplify the design process, TI provides two sets of compensation network. These compensation values have been verified by design, and validated during the product development process, at different input and with different battery cell configuration. There is no benefit to further optimize the compensation networks.

    Instead of  testing the bode plot, I would suggest you testing the transient step change if possible. 

    Regards,

    Tiger