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LM5175-Q1: The time it takes for the output to go down from 12V to 5.5V

Anna Yanovsky
Prodigy 240 points
Part Number: LM5175-Q1

Hi, 

I'm trying to simulate the time it takes the output to go down from 12V to 5.5V. I tried to add a switch to the WEBENCH design after I exported it (SW1 time controlled switch, Tina file attached). The switch doesn't turn off at 500usec as I specified - It seems it takes time for the switch to respond. I think it's related to the other time constant in the circuit, but I'm not sure how to fix it. I need to turn off the voltage after it reaches 12V and see how much time it takes the output to reach 5.5V. I tried another pulse input as well and it didn't work. 

I would really appreciate an assistance with this issue. 

Thanks! 

Annawebench_design_6501547_3 - autosave 20-12-22 11_19.TSC 

  • 0
    Prodigy 240 points

    Hi, 

    Please Ignore my previous question - I understood my mistake. 

    I still need a way to see how much time it takes the voltage to get down to 5.5 V, when the Power stays the same (65W for our purposes). 

    Is there a way to add a Power controlled load to the LM5175-Q1 Webench exported design?

    I can see that currently there is a regular resistor there because the assumption is that the output voltage is pretty much the same. 

    I need my capacitors to hold the voltage for a few mseconds after shutdown and I currently don't see a possible way to simulate this option. 

    Thanks! 

    Anna

  • 0 in reply to Anna Yanovsky
    TI__Mastermind 46905 points

    Hi Anna,

    the expert supporting this device is out of office. thus the reply for your question would be delayed. thanks for the understanding 

  • 0 in reply to Anna Yanovsky
    TI__Guru 58225 points

    Hello Anna,

    Sorry for the delayed response.

    In Webench I do not think that you can simulate a fixed power load. I would recommend to use pSpice for this purpose, e.g. pSpice for TI