• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 312 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.

LP8758-B0: LP8758-B0 efficiency curve in datasheet

K. Sasaki14
Guru 10200 points
Part Number: LP8758-B0

I have a question about efficiency curve in datasheet figure 26 and 27.
In this curve, efficiency becomes better as the input voltage increases.

Why does the efficiency curve become like this?
Normally efficiency becomes lower as voltage difference between input and output is large.

Best Regards,
Kohei Sasaki

  • 0
    TI__Guru**** 191445 points

    This is pretty easy.  The input voltage for those curves are relatively low voltage.  The input voltage is used for the gate drive for the internal switching FETs.  Higher input voltage means stronger gate drive and lower RDSon.  The efficiency gain from that offsets the switching losses from higher drain to source voltage.