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TPS53353: TPS53353 load regulation

Frank Xiao
Genius 12055 points
Part Number: TPS53353

Hi team,

We want to check why the load regulation curve is like this.0-2A, the load regulation change a lot, but it keep stable after the current  above 2A. (Even the FCCM mode)Thanks.

  • 0
    TI__Guru 56985 points

     

    Because the TPS53353 uses D-CAP mode control with valley voltage regulation, as the inductor current becomes negative during the high-side FET "OFF" time the relationship between the internal ON time and the external SW voltage on-time changes as the negative inductor current drives the SW voltage high during the dead-time, the peak to peak ripple increases at light load, even in FCCM so we see a small rise in the output voltage as part crosses the critical conduction boundry.

    This is much more pronounced in Auto-skip mode as more and more of the inductor ripple current is greater than the average load current.