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LM34936: discrepancy between schematics and BOM in SLVUAP7A

Matthieu Imbert
Intellectual 820 points
Part Number: LM34936
Other Parts Discussed in Thread: LM5175

Hello,

M. Xi of TI gave me some hints for adapting LM34936 to SLVUAP7A, i.e. designing a DC/DC converter with narrow input voltage and broad output voltage.
Except for a few parts which have to be changed in order to migrate from LM5175 (SLVUAP7A) to LM34936, everything should remain the same.
But there are discrepancies between the values noted on the schematics of FIG.2 (SLVUAP7A) and the values in the BOM.
Those are critical parts for current loop compensation: R10 and C13.
Can someone tell me if I should trust the values noted on the schematics or the ones in the BOM?

On the schematics, it reads R10=1k, C13=27nF, in the BOM it reads R10=3.3k, C13=22nF.

I don't actually have the EVM board of SLVUAP7A, so I can't check the values by reading or measuring them.

Thanks for the help.

Regards.
Matthieu

  • 0
    TI__Guru* 78400 points

    Hi Matthieu,

    I would trust the BOM instead of the schematic. The BOM should reflect the actual build of the EVM, while the schematic may have some initial values not updated for publication of the article.  I can check with the authors of SLVUAP7A, and see if their schematic is up to date, but this should not stop you from moving forward: as long as the component position is reserved on PCB, you can always change the part.

    Thanks,

    Youhao