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LMR51610: Calculation tool LMR51610-DESIGN-CALC

John Treubig

Prodigy 50 points

Part Number: LMR51610

Tool/software:

Can someone please verify that the Calculation Tool LMR51610-DESIGN-CALC found here LMR51610 data sheet, product information and support | TI.com appears at STEP 5: Feedback to return resistor values that are 10X what the datasheet calculation shows. Was attempting to use this tool to validate the values I picked and noticed the output doesn't match Table 8-1 of the datasheet below.

0 Onkar Bhakare 1 month ago

TI__Genius 11996 points

Hello John

Thanks for writing to us!

What is the value of Rfbb you are using in your calculation?

Thank you

Regards

Onkar Bhakare

0 John Treubig 1 month ago in reply to Onkar Bhakare

Prodigy 50 points

Hi Onkar,

I'm designing three supplies and here's the resistor pairs that I've come up with:

1.2V: High-side FB=10K Low-side FB=20K

3.3V: High-side FB=10K Low-side FB=3.36K

5V: High-side FB=10K Low-side FB=1.87K

Thanks in advance,

John

0 Onkar Bhakare 1 month ago in reply to John Treubig

TI__Genius 11996 points

Hello John

It is giving correct results to me. However, it is taking some time to perform calculations. You can monitor bottom left to check status

Check following results

1.2V

3.3V

5V

Thank you

Regards

Onkar Bhakare

0 Onkar Bhakare 1 month ago in reply to Onkar Bhakare

TI__Genius 11996 points

Hello John

Let me know if need further help. Kindly close the thread if query has been resolved.

Thank you

Regards

Onkar Bhakare

0 John Treubig 1 month ago in reply to Onkar Bhakare

Prodigy 50 points

Hi Onkar,

Must have been the copy of the XLSX file that I initially used, as a fresh copy is giving correct data. Your data also helped vet my calculations.

Thanks for the help,

John