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TPS92691: About TPS92691 Queation

Kuo John
Expert 1075 points
Part Number: TPS92691

Hi TIer,

I have question about TPS92691 design buck-boost by B2B.
May I know TI have document describe B2B how to work? such TI's SLVA 477B Application Report.

  • 0
    TI__Mastermind 28655 points
    Hello Kuo,

    You can look at this as a reference: www.ti.com/.../slyt286.pdf. Many of the datasheets show the calculations for buck as well as buckboost, the TPS92691 has this in the applications section starting at page 17.

    The buckboost operates similar to a flyback. For a boost to battery (or positive input) configuration, Figure 26 in the TPS92691 datasheet, the inductor is tied to the input voltage and charges with a low side MOSFET when it turns on. When the MOSFET turns off the current in the inductor continues to flow and the voltage across it switches polarity. This causes the open end of the inductor (when the MOSFET is off) to be higher voltage than the input. The output voltage of a buckboost to sit on top of Vin. At 50% duty cycle Vout = Vin, the datasheet has these equations. If Vin = 12V at 50% duty cycle Vout would equal 12V and Vout with respect to GND would be Vout + Vin = 24V. BTW, Vout to GND is a boost configuration.

    Regards,