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TPS62110: Gain and Phase Margin simulation. LT-Spice model for the device? Minimum inductor for low output current?

Tu Nguyen
Prodigy 45 points
Part Number: TPS62110


Hi,

I am trying to simulate the gain margin and phase margin using the provided PSpice-TI model.   I injected the AC voltage sweep into the VFB to do this but was unable to get a proper result.

Do you have anything that does the gain and phase margin for this device?  I have turned to LT-Spice by importing the provided PSpice model, but it does not work. Please can you also help generate a working LTSpice model or a compatible version of it for LTSpice?

My design criteria are very simple: 14.5 Vin, 3.3Vout or 1.8Vout. Cin = 2x 10uF; Cout = 3x 22uF; Cff = 10pF; L = 6.8uH ?  for low current supply of 100mA.  Any suggestion?

Thanks,

Tu Nguyen

  • 0
    TI__Mastermind 27030 points

    Hi Tu,

    The PSPICE model is a transient simulation model and will not be able to produce gain/phase margin numbers. This will require a SIMPLIS model or an AC model for this part but unfortunately we do not have any models other than that on ti.com product page of this part. You can always estimate stability of the design using other techniques like load transient simulation.

    Thanks,

    Amod