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TPS2557: Turnon Time at CL=1mF, RL=Open

Hirokazu Takahashi
Expert 8420 points
Part Number: TPS2557

Hello Team,

I could find that Ternon Time, ton, is 9ms as max under the condition of CL = 1 µF, RL= 100 Ω in the datasheet page 6.
Could you let me know the ton under CL=1mF and RL=Open, Vin=3.3V?

Best Regards,
Hirokazu Takahashi

  • 0
    TI__Mastermind 18031 points

    Hi Hirokazu,

    • Ton = 5.12ms with the condition CL=1mF and RL=Open, Vin=3.3V;
    • Ton=6.71ms with the condition CL=1mF and RL=Open, Vin=6.5V;

                 

    • Ton = 6.39ms with the condition CL=1uF and RL=100ohm, Vin=6.5V;

              Noted:  Due to the no-stock of EVM and device, I simulate the part with software TINA.

                           Have checked with Char data, can make sure the value is right.

    Ziv

  • 0 in reply to Ziv Zhang
    TI__Expert 8420 points

    Hello Ziv-san

    Thanks for your support.
    I have additional question below.

    Could you please let me know ton at the Current-Limit Threshold seting as 1.6A and 0.9A?
    Your similation result may be typical value.
    Please let me know about min and max including all temp range and product variation.

    Best Regards,
    Hirokazu Takahashi

  • 0 in reply to Hirokazu Takahashi
    TI__Mastermind 18031 points

    Hi Hirokazu,

    1. Ton has nothing with current limit threshold.

    2. For your another question, Ton defination, I have answered the question, Min and Max is fixed considering margin.

    You can also refer to the below pic:

  • 0 in reply to Ziv Zhang
    TI__Expert 8420 points

    Hello Ziv-san

    Thanks for your reply.
    How about the variation under the condition of CL=1mF and RL=Open, Vin=3.3?
    Can your caractrization data cover the condition?
    If so, could you let me know the reason.

    Best Regards,
    Hirokazu Takahashi