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Original question:

TPS2661: Spice model will not load into Tina

TPS2661: Transition from loop to powered mode to +Vs/-Vs supply TPS26610

Mark Betts
Prodigy 70 points

Part Number: TPS26610

Hi, I am not clear of the device behavior from the data sheet when the TPS26610 transitions from loop testing power to +Vs/-Vs power.

I am powering the TPS26610 from 0 and 4.5V, and biasing to 1.65V, so it can conduct +/-20mA for normal operation.

Would the device drop out In/Out when device power VSns is >1.8V is restored, if the +Vs/-Vs supply was less than +/-8.5V (Un powered loop testing Max volts), or is there a time transition time ?

It appears that it would never transition from loop power to +Vs/-Vs if they are less than +/-8.5V ? The UVLO on In/out would latch the device off ?

  • 0
    TI__Guru** 104226 points

    Hi Mark,

    Thanks for reaching out!

    I will get back on this by tomorrow.

    Best Regards, 

    Rakesh

  • 0 in reply to Rakesh
    TI__Guru** 104226 points

    Hi Mark,

    The device should enter into normal mode of operation when VSNS crosses 1.8V unless there is any UVLO or OVLO fault.

    For UVLO fault on the input side, the device stays latch-off.

    What is the IN voltage you are observing? Can you share some test waveforms ?

    Best Regards, 

    Rakesh

  • 0 in reply to Rakesh
    Prodigy 70 points

    Hello Rakesh,

    OK so the VSNS>1.8V transition from Loop power to Self powered should be OK so long as the IN/OUT are within the TPS26610 +Vs/-Vs rails.

    I do not have any test waveforms, just the data sheet. I have ordered a TPS26610 EVM board.

    Reading the data sheet, when loop powered it will have +/-8.5V (Max) on the IN pin, when the VSNS transitions to greater than 1.8V, the IN pin will have +/-8.5V (loop powered) on IN which is greater than the +Vs (4.5V supply), and force Over volt protection IN to be triggered, unless the +Vs is greater than +/-8.5V (approx) when VSNS >1.8V is applied ?

    I do not see how this transition can occur with low Vsupply (4.5V), for example input EMC 10nF filter caps will hold the +/-8.5V for a few tens of uS.

    Regards,

    Mark.

  • 0 in reply to Mark Betts
    TI__Guru** 104226 points

    Hi Mark,

    IN pin does not has overvoltage protection.

    Best Regards, 

    Rakesh