WEBENCH® Tools/TPS54291: TPS54291 inductor & compensation values calculations

Hi John,

I couldn't find the webench design for this IC.

PFA image of my schematic. I have calculated the feedback resistors & wanted to calculate the inductors & compensation values.

Thanks & regards,

Pravardhan U.S

Hi John,

Sorry for the late reply.

Please find below the original circuit used from the EVM board:

Regards,

Pravardhan U.S

Hi John,

PFA the schematic of TPS54291 from the Xilinx ZC706.

zc706-schematic-xtp215-rev2-0.pdf

I will be making an excel file with the values from the EVM to verify the Inductor & compensation values. And also I will add my calculated values.

Thanks & Regards,

Pravardhan U.S

I'll check your calculations when you post them.

Hi John,

PFA excel calculations tabulated with formula as per example given in datasheet SLUS973A–OCTOBER 2009–REVISED NOVEMBER 2016

TPS54291 calculations.xlsx

Please check the "For 3.3V (CH-1)" worksheet in excel.

There is a mistake for fPOLE calculation formula in page no. 22 but in page no. 16 it is correct. Please correct it in the datasheet.

So following are my observations:

1. L value selection to be made near by value & later use it for calculations
2. Cout to be taken a higher value & later use it for calculations
3. Rcomp value selection to be made near by value & later use it for calculations

And I didn't get the calculations or formula on how to calculate "plus a high-frequency capacitor to reduce the gain at high frequency"? This is C7 (15pF) in page 18 of datasheet.

I will now start with my actual required calculations & share the results.

Thanks & regards,

Pravardhan U.S