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LMR16010: Webench Simulation deviation from calculation

Rithu Hari
Prodigy 10 points
Part Number: LMR16010

Tool/software:

Hi, 

I tried simulating the circuit of LMR16010 on TI's webench and I altered the values to the calculated values based of the formulas of the datasheet. The Cout value calculated is about 5uF. I have changed the values in the simulation to 10uF, yet the design fails on the phase margin, It requires a Cout of 47uF.

Can you please let me know the reason for such huge difference in the Cout calculation and simulation values?

The design was calculated for 250KHz frequency.

Attaching the images of the simulation and error below.

  • 0
    TI__Mastermind 25280 points

    Hi Rithu,

    Webench simulation models have some base limitations due to available data given, so it is possible that the given model only works for larger values of Cout. The best way to know is to test the circuit with 5uF and examine the loop response. 

    Regards,

    Richard