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TPS61165 configuration as buck-boost

Knighty Nimp
Expert 1260 points
Other Parts Discussed in Thread: TPS61165, TPS63000

 

Can TPS61165  configuration as buck-boost? we are considering this to drive LED.

Thanks,

NT

  • 0
    TI__Guru**** 166696 points

    If by buck-boost, you mean able to have the output voltage above and below the input voltage, then yes, the TPS61165 works as a SEPIC converter.  Please refer to figuree 20 on page 18 of the datasheet.

     

  • 0 in reply to Jeff F
    Expert 1260 points

     

    What is the adventage of SEPIC to drive LED when compare to buck boost ?

    Best Reagrds,

    Naret

  • 0 in reply to Knighty Nimp
    TI__Guru**** 166696 points

    The term "buck-boost" originally referred to a converter that took a positive voltage and converted it to a negative voltage.  Now, the term refers to a converter that provides an output voltage from an input voltage range that can be higher and lower than the output voltage.  There are four switch, single inductor converters (e.g. TPS63000) that change from being a buck converter if Vin>Vout to a boost converter if Vin<Vout.  A boost converter or boost converter based WLED driver (e.g. TPS61165) can be configured as a SEPIC converter, with two inductors and additional capacitor (instead one inductor in a boost configuration) in order to provide an output voltage that is in between the input voltage range.