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TPS63820: BB_WINDOW and HYS_CURRENT

Shunsuke Yamamoto
Genius 10321 points

Part Number: TPS63820

Hi team,

  1. What is the funtion of BB_WINDOW? The explanation below is little, so I don't understand how it works.

image.png

2. What is the function of HYS_CURRENT? The explanation below is little, so I don't understand how it works.

image.png

Best regards,

Shunsuke Yamamoto

  • 0
    TI__Mastermind 23945 points

    Hi Yamamoto-san,

    I'll update to you today.

    Regards

    Lei

  • 0
    TI__Mastermind 23945 points

    Hi Yamamoto-san,

    Here is a picture which shows clearly what is the "BB(buck-boost)_window", hope it works.

    HYS_CURRENT = peak inductor current - valley inductor current.

    Regards

    Lei 

  • 0 in reply to Lei Zhong
    TI__Genius 10321 points

    Hi Lei-san,

    Thank you for the answers. Regarding HYS_CURRENT, peak inductor current and valley inductor current depend on the inductance, output current etc. I think it isn't defined by the register. How does HYS_CURRENT work in the device?

    Regarding register configuratlon of TPS638201, Is it possible to set the register before enabling the device? The device is powered by input voltage.

    Best regards,

    Shunsuke Yamamoto

  • +1 in reply to Shunsuke Yamamoto
    TI__Mastermind 23945 points

    Hi Yamamoto-san,

    Although the HYS_CURRENT indeed varies as the Vin, Vout and Iout changes. The base value, or the major percent of the HYS_CURRENT is decided by the register.

    Let's use an example of boost steady-state to see how the HYS_CURRENT works. The inductor current(IL) valley is decided by the Iea (proportional to the EA output). Once the IL valley touches the Iea, the HS-FET is off and LS-FET is on, the IL increases. Once the increased IL equals the HYS_CURRENT, then HS-FET is on and LS-FET is off, IL decreases.

    Regarding the TPS638201, the default internal EN bit is 0. So the register can be configured before enabling the device. If you see that the device is enabled as soon as Vin > UVLO and EN pin is high, please check whether it is the TPS63820, not TPS638201.

    Regards

    Lei