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TPS50601A-SP: Pspice model, error amplifier gm

Mark Guastaferro
Genius 11095 points
Part Number: TPS50601A-SP

The data sheet for the TPS50601A-SP lists the error amp gm as being between 1000uS and 2000uS with a typical value of 1400 uS.

Looking at the average Pspice file for the TPS50601A (download file SLVMCL4A.ZIP), it looks like the simulation has the gm of the error amplifier set to 1750u in this equation:

G_ABM2I1         GND COMP VALUE { LIMIT(((V(N1165059) - V(VSENSE))

+  *1750u),-125u,125u)    }

This value is between the data sheet limits, but higher than the nominal value of 1400uS.  Why is the Pspice value set to the higher end of the range?  Is this based on aligning the simulation result with the actual measured results? 

  • 0
    TI__Genius 14540 points

    HI Mark,

    I'm looping in Sarah, our modeling expert, to look into this.  I suspect the model was created before device characterization completed and was never updated upon completion.

    thanks

    Christian

  • 0
    TI__Expert 7085 points

    Hi Mark,

    I reviewed our documentation for this model's development and your assumption is correct. The value of GMea in the model was set to 1750 uS instead of the typical 1400 uS mentioned in the datasheet in order to tune the simulation results to better match measured data. Since this value still falls within the datasheet min/max range for this parameter, it was determined to be an acceptable way to tune the model. 

    Thanks,

    Sarah