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TPS72715DSEEVM-406: TPS72715

william pellico
Prodigy 10 points
Part Number: TPS72715DSEEVM-406
Other Parts Discussed in Thread: TPS727

I am trying to use Tina to look at the fast transient resposne for a number of TPS parts.  In particualar the TPS72715 set to 4.6 or 5 Vout.  What are the parameter settings needed for this to work in Tina?  Also, I did not find any data plots of pulse reposne for this part - in the hundreds of ns range.

Thanks

  • 0
    TI__Genius 12375 points

    Hi William, 

    Are you looking to do a line transient or a load transient? Typically, a 1us rise and fall time is used. What is the specific conditions you are looking for? Perhaps it would be more valuable to try and test this on the bench, although it could require some time to get the setup done. 

    Best, 

    Edgar Acosta

  • 0 in reply to Edgar Acosta1
    Prodigy 10 points

    Hello Edgar -

    My concern is that I'm using a TI component to power a circuit that contains hundreds of SiPMs (Si photo multipliers).  Typically they look like a high impedance but when they get a burst of light - they avalanche and generate lots of current that I pass through my op amp circuits.  The pulses can be fairly fast - 10 to 100 ns for rise times and last about a 1 us.  I need to see the pulse very clearly to understand the photon burst.  I am hoping that the LDO that Im using can respond to the current needed and not distort my electronics - which are sensitive to voltage regulation. 

  • 0 in reply to william pellico
    TI__Genius 12375 points

    Hi William, 

    If I understood correctly, the SiPMs are powered by TPS727? 

    Notice for the DS that at 1us fall and rise the overshoot and undershoot are ~50mV with a step from 0.1mA-200mA:

    At faster ramp rates, the overshoot and undershoot can become larger.

    This can improve by setting the DC load slightly higher:

    Although notice that it is still within the vicinity of 50mV. 

    The response will also improve depending on the headroom given rather than operating near drop out conditions i.e Vin=5.5V and Vout=5V.

    Another option is adding more cap at the output, however, this comes with the exchange of increasing inrush current during startup:

    I will look into setting the TINA for load transients, although I do know that the load transient response is not very well modeled, hence, looking it under the bench will provide a better insight. 

    Best, 

    Edgar Acosta