• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 310 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

LM5117: Benefit of using LM5117 vs traditional method in SNVA829

diverger
Expert 1285 points
Part Number: LM5117


Hi,

I'm reading the SNVA829. In the section 4 of this doc, it says the Rsense in series with the output will increase the loss. But when using a Rs to sense the output current, it will also increase the loss, right? As shown in section 6, the current flows into Rs will be 2*Iout. So, if Rs is chosen larger than Rsense/2, the loss increasing will even worse than the traditional method.

Thanks.

  • +1
    TI__Guru 62461 points

    Hello Diverger

    Defining Rsense as a sense resistor in series with the buck inductor and Rs as a sense resistor in series with the low-side power MOSFET, (1-D) x Ploss(Rsense) = ~ Ploss(Rs) .

    Which means the power loss of Rs is always smaller than the power loss of Rsense. 

    -EL