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TPS61178: General Question

Liang Tsai
Expert 5840 points
Part Number: TPS61178
Other Parts Discussed in Thread: TPS61088

Tool/software:

Hi Teams,

I was wondering why I cannot type  VIN=4.7V ，VOUT=5V ，IOUT=3A for TPS61178 in the webench?

It seems that those are all under specification. Thanks for the help!

Best,

Liang Tsai

  • 0
    TI__Genius 16805 points

    Hi Tsai,

    I guess the webench uses default 2Mhz frequency to calculate.

    The close of input and output triggers on time limitation.

    The device is capable of such condition.

    Could you tell me why TPS61178 is selected?

    It seems over spec for this application, and I can recommend another device to you.

    Best Regards,

    Fergus

  • 0 in reply to Fergus He
    TI__Expert 5840 points

    Hi Fergus,

    Thanks for the reply, I saw on the data sheet that it can go up to 2.2MHz for the switching frequency. I was wondering even though it is a overkill solution, it should work properly right?

    Customer is also considering using TPS61088, is this a good choice?

    Thanks for the help!

    Best,

    Liang Tsai 

  • 0 in reply to Liang Tsai
    TI__Genius 16805 points

    Hi Tsai,

    As we talked. both TPS61178 and TPS61088 cannot work with 2.2Mhz when Vin=4.7 and Vout=5V, this triggers its minimum on time limit.

    Best Regards,

    Fergus