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TPS73801: Line transient response

Noriyuki Takahashi
Genius 11250 points
Part Number: TPS73801


Hi team,

Could you tell the division of x-axis of Figure 23 on the datasheet?

Could you also give some comments on the followings if possible?

- In figure 23, the input voltage transient is about 1V and  the transient of Vout is about 5mV. So is it OK in general to guess if the input voltage transient is about 5V, the transient of Vout can be also 5 times, that is 25mV?

- If the input voltage transients more rapidly, the transient of Vout would be larger. Are there ways to guess the relation between the input transient time and the transient of Vout?

Regards,

Noriyuki Takahashi

  • 0
    TI__Genius 12695 points

    Hi Noriyuki, 

    For the x-axis, I will need more time to obtain that information. 

    Regarding your other questions, yes in general it is ok to guess that the transient of Vout could be 5x if your Vin transient is 5V.

    As for the next question, unfortunately there is no easy way to estimate such relationship for the ramp rate of Vin to the transient of Vout. 

    One of the reasons this is complicated is that when you change the ramp rate you also change the frequency content of the signal. This shifts the PSRR vs frequency You would need to know the frequency content of this signal to estimate the PSRR.

    Hope this answers your doubts. And please bare with me to obtain the time scale of fig 23. 

    Sincerely, 

    Edgar Acosta

  • 0 in reply to Edgar Acosta1
    TI__Genius 11250 points

    Hi Edgar,

    This is kind reminder.

    Could you get any feedback?

    Regards,

    Noriyuki Takahashi

  • 0 in reply to Noriyuki Takahashi
    TI__Genius 12695 points

    Hi Noriyuki, 

    I am still looking into this trying to reach the correct group to provide such information. I will reply as soon as I get the time division for figure 23.

    Best, 

    Edgar A.

  • 0 in reply to Noriyuki Takahashi
    TI__Genius 12695 points

    Hi Noriyuki, 

    I have news. TPS73801 comes from the same die family as TPS7A4501. This means that the EC are very much equal. Having that said, I am trying to test the device here in our labs to provide you an oscilloscope image, however, from the TPS7A4501 I have the following image:

    This shows the same transient from 4.3V to 5.3V and shows the V/div for both Vin and Vout as well as the time scale. I hope this helps you.

    Best, 

    Edgar Acosta