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A Question from a TI article

Viqar Ahmad
Prodigy 10 points

Hi all,

I am referring to an article in Analog Applications Journal 3Q 2014 by the name of 

Design tips for an efficient non-inverting buck-boost converter

Now, in Figure 8 of this article on page 6(25), there is an efficiency graph wrt input voltage.

I am unable to understand why it peaks at a certain input voltage and decreases either side.

Thanks in advance

Regards,

  • 0
    TI__Expert 5130 points
    Hello Viqar and thank you for your inquiry regarding the Analog Apps Journal article. We are currently contacting the author of the article to either provide us with an answer or to have him contact you direct with a response.
  • 0
    TI__Prodigy 735 points

    Hi Viqar,

    I'm sorry for the late reply.  The reason that the efficincy spikes in the middle is because that is when the buck-boost switches from operating as a less efficient boost converter, to a buck converter.  Then once it's operating in step-down mode, the efficiency stars to drop as the inout voltage starts to differe more and more above the output voltage.

    Regards,

    Fabio