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TPSM83100: Minimum on time

Shunsuke Yamamoto
Expert 7701 points
Part Number: TPSM83100
Other Parts Discussed in Thread: TPSM82823A

Tool/software:

Hi team,

May I know the worst case minimum on time of TPSM83100? I cannot find out the value of this parameter.

Best regards,

Shunsuke Yamamoto

  • 0
    TI__Prodigy 550 points

    Hi Shunsuke,

    Our engineer is currently out of office, please expect a reply by next week Wednesday. Thank you for your patience.

    Best regards

    Yezi

  • 0 in reply to Yezi Yang
    TI__Expert 7701 points

    Hi Yezi,

    If possible, could you please assign another person on this thread since this is an urgent request? It isn't acceptable to wait the response until next Wednesday.

    Best regards,

    Shunsuke Yamamoto

  • 0
    TI__Guru 65340 points

    Hello Shunsuke,

    What exactly do you mean with minimum on time? The TPSM83100 is a module with 4 switches integrated for being able to buck and boost the input voltage to a regulated output.

    If the output voltage is too high, it will stop switching or push current back to the supply, dependent on the selected mode.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    TI__Expert 7701 points

    Hi Brigitte,

    Thank you for the reply. In COT architecture of buck dcdc converter, the minimum on time restricts the minimum output voltage. For example, TPSM82823A describes the equation of on time on the datasheet.

    But I misunderstood that TPSM83100 adopts COT architecture. But TPSM83100 adopts peak current mode control. In peak current mode control, may i know how to estimate the available minimum output voltage?

    Best regards,

    Shunsuke Yamamoto

  • 0 in reply to Shunsuke Yamamoto
    TI__Guru 65340 points

    Hello Shunsuke,

    TPSM83100 is a buck-boost converter. So it is able to increase and reduce the input voltage to a target voltage you want to have. 

    I do not see why you think that the minimum on-time defines the minimum output voltage in a synchronous converter.

    The recommended operating condition for output voltage is 1.2V to 5.5V.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    TI__Expert 7701 points

    Hi Brigitte,

    Please let me change the question to figure out the customer's question. Does TPSM83100 have minimum on time or minimum off time?

    Best regards,

    Shunsuke Yamamoto

  • +1 in reply to Shunsuke Yamamoto
    TI__Mastermind 32350 points

    Hi  Shunsuke,

    I think you mean minimum off time in boost mode and minimum on time in buck mode, right? 

    They are around 50ns, it is not an accuracy data but should be close.

    Mostly, we do not care about this data, because in all application which this device can be used, such as max 5.5Vin and min 1.2Vout, the duty cycle is close to 22%, which means on time is close to 110ns.  Far away from the limit of minimum Ton.

    As a buck boost converter, device will automaticly change to other mode, such as buck to buck-boost when or before minimum off time in buck mode triggered .

    Regards

    Tao