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TPS2492: Latch off with a short signal

Tilen Sluga
Prodigy 145 points
Part Number: TPS2492

Hi,

What is the best way to latch OFF the TPS device with only a short signal? With the EN pin pulled low I can only disable the device as long as I can hold the EN pin low which is only as long as the microcontroller has power (powered from the TPS).

I can make a external latch for pulling the EN low until the next power cycle but I would like to know if there is some other option like getting the device in a fault state so it stays OFF until the next power cycle or something similar?

Thank you.

  • 0
    TI__Genius 10370 points

    Hi Tilen,

    Welcome to E2E! You're in luck because the TPS2492 is the latched off version. Once a current limit and/or power limit fault occurs, due to timeout, the device latches off. One way to turn it back on is by cycling the UVEN pin. Look below for a typical circuit that controls the UVEN pin to cycle the part on and off:

    I hope this helps :-)

    Best Regards,

    Aramis P. Alvarez

  • 0 in reply to Aramis P. Alvarez
    Prodigy 145 points

    Hi Aramis,

    Thank you for the replay. The restart is not the problem I have this sorted just like in your schematic. The problem is how to remotely (from uC) shut the device OFF until the next power cycle? Is there a recommended way of doing this?

    Regards,

    Tilen

  • 0 in reply to Tilen Sluga
    TI__Genius 10370 points

    Hi Tilen,

    The restart control can also be used as a shut off control. When the UVEN pin goes low, the gate will quickly be pulled down. This is probably the most used way to shut off the device from a uC (pulling the UVEN pin low). 

    Best Regards,

    Aramis P. Alvare