Due to the U.S. Thanksgiving holiday, please expect delayed responses during the week of 11/22.

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

WEBENCH® Tools/LMZ31704: Incorrect Rset in Webech simulation

Part Number: LMZ31704

Tool/software: WEBENCH® Design Tools

Hi ,

When simulating LMZ31704 with Vout =1.8V and any Iout the automatically chosen Rset is 732 ohm while form the data sheet (table 2 page 11) the value for 1.8V should be 715kohm.

I can change it  by myself but wonder why lower output voltage is chosen by default?

Sebastian

  • Hi Sebastian,

    I assume you mean 715ohm and not 715kohm. You are right about the value not being exact. With 1.8V Vout, according to equation 1 on page 11, Rset should be 0.715kohm or 715ohm. The table 2 on page 11 suggests the same value as well. In WEBENCH, we are picking 732 ohm which is due to a range on Rset from 715 ohm (680-750) and it ended up picking 732ohm but it should pick 715ohm. We will get this updated in the tool. Thanks for your feedback.

    Regards,
    Amod
  • Thanks Amod,
    Yes sorry for the typo , thanks for the answer
    Sebastian