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BUF634A: Parallel configuration

Ryuuichi machida
Guru 12970 points
Part Number: BUF634A
Other Parts Discussed in Thread: LMH6321

Hi,

I would like you to confirm whether parallel configuration is acceptance for BUF634A and LMH6321 or not.
This is not TI device but what I would like to configure is as shown below.
Example : 
image.png
Could you please confirm about above ?

Best Regards,

  • 0
    TI__Expert 3160 points

    Ryuuichi,

    Two BUF634A/LMH6321 can be connected in parallel but shorting the output of the two buffer is not recommended. Even the small offset voltage at the output can cause a very large circulating current between the outputs of the two buffer. To overcome this you need to connect isolation resistor between each of the two buffers' output and the load to make sure they share the current evenly and to reduce the circulating current.

    Rrgards

    Anant

  • 0 in reply to Anant Sinha
    Guru 12970 points

    Hi Anant-san,

    >Even the small offset voltage at the output can cause a very large circulating current between the outputs of the two buffer. 
    Let me confirm about below because I may have caused misunderstanding.

    * What I would like you to confirm is below.

    - Parallel connection two BUF634A is acceptable or not.
      (This means short input and output connection.)
    - I can apply same configuration to LMH6321 as well or not. 

    I did NOT mean "parallel connection between BUF634A and LMH6321".
    In this situmation, is your answer unchanged ?

    Best Regards,

  • 0 in reply to Ryuuichi machida
    TI__Expert 3160 points

    Ryuuichi San,

    Yes even if you connect two BUF634A  (or two LMH6321) togeather in parallel, it's better to put isolation resistor at the output, as part to part the offset can vary which can cause larger circulating current if you directly short the output togeather.

    Regards

    Anant