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TPS3850: SET0 and set1 delay requirement

James Rabusa
Prodigy 60 points
Part Number: TPS3850

It is said that when changing the state of SET0 and SET1, there should be 500us delay. I tried pulsing them at the same time but i think the IC still functions correctly. Please give advice of what should i expect if there is no delay.

  • 0
    TI__Genius 9375 points

    Hi James,

    The 500us spec for SET0 and SET1 occurs when you need to switch back and forth between states. For example, on SET0, if you need to go from SET0=0 to SET0=1 then SET0=0 again, after you switch to SET0=1, you need to allow 500us to switch back to SET0=0. If you change SET0=0 to SET0=1 and also SET1=0 to SET1=1 for example, this should not be an issue doing instantaneously.

    Thanks,

    Abhinav.

  • 0 in reply to Abhinav.Sharma
    Prodigy 60 points

    I am confused. Based from datasheet, t_SET=500us is the delay between SET0 and SET1 pins.
    From your explanation, it is different.
    I tried the setup on the datasheet but even if there is no delay between SET0 and SET1 pins, IC seemed to be working well.
    I have attached the details.SETx_Pins_Delay.docx

  • 0 in reply to James Rabusa
    TI__Genius 9375 points

    James,

    While the datasheet says there is this minimum delay to transfer between the two pins, this is what is recommended. That being said, in your own testing, you might have found that this works with even no delay. This may work, but we do not guarantee it always switching in this case. If you wish to design with an instant swtich in mind, keep in mind that we don't officially support that configuration and if you have issues with the device not functioning correctly, it is due to this minimum Tset.

    Thanks,

    Abhinav.

  • 0 in reply to Abhinav.Sharma
    Prodigy 60 points

    Hi Abhinav,

    This is a good help. Thank you very much!