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TPS2557: FAULT Signal

Patrick Wallner
Prodigy 10 points
Part Number: TPS2557

Hi,

we want to use the TPS2557 for our application because this parts fits perfectly. My question is, is it a must to use the FAULT signal? We don't really need it, So can we simply ignore the pin and keep it disconnected? In the datasheet I can't find this information.

Second question, we want to use a ATTiny chip to control the TPS2557, so can we directly connect a GPIO from the ATTiny to the EN pin from the TPS2557?

Thank you,

Best regards

Patrick

  • 0
    TI__Mastermind 18556 points

    Hi Patrick,

    1, Yes, if you don't need to use the fault pin, you can float it definitely, because it is a open-drain structure, it will be ok.

    2, Yes, you can use the GPIO to control the EN pin, and just combine them directly, but just make sure you have a original pull down structure in the EN pin, when you want to use the GPIO to enable it, then just pull up it.

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    Prodigy 10 points

    Hi Kuno,

    thank you for the fast answer, but for 2. I am not sure if I unterstood correctly. I can connect directly without any other part, I will simply program the GPIO as output and via code I can set the output to high. Is this what you mean?!

  • 0 in reply to Patrick Wallner
    TI__Mastermind 18556 points

    Hi Patrick,

    Sorry to make you confused, yes, you can connect the GPIO to EN directly, what I mean is that you need to make sure the EN pin have a strong pull down before you use the GPIO to enable it, you can reserve a EN pull down resistance to achieve it, thank you.

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    Prodigy 10 points

    Hi Kuno,

    thank you! Now it's clear.  What do you think, 10k enough?

    I have additonal 2 questions, hope you can answer it, then everything is clear, I promise ;)

    Compensator out located at the out pins is not defined. Which compensator do you suggest? We want to use 5V with 5A on the outlet. The dev board is limited to 1A and use a 150uF...

    And in the datasheet is written for the PowerPad "Internally connected to GND. Used to heat-sink the part to the circuit board traces.". So is it enough to have copper below the chip, or should we fill the complete PCB with copper to ensure the heat transfer?

    Thank you again, you are a great help for me!

    Regards

    Patrick

  • +1 in reply to Patrick Wallner
    TI__Mastermind 18556 points

    Hi Patrick，

    Don't worry, I am so happy that I can solve your confusion.

    1, For the EN pull down resistance, yes, I guess 10kohm should be enough.

    2, For the Compensator out, you mean the capacitor of the out pin? Right? Recommend use one 0.1nF and one 150uF will be enough.

    3, For the PowerPad connection, you can add copper below the chip, and connect this copper to the whole ground, then you will have a very good thermal performance.

    Feel free to let me know if you still have any questions, thank you.

    Best Regards,

    Kuno

  • 0 in reply to Kuno Wu
    Prodigy 10 points

    Dear Kuno,

    thank you very much! Everything is clear now! Very great help for me!

    Best regards

    Patrick