This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hey team,
I had a customer that was looking at these two parts and doing a brief comparison of the two. They highlighted the difference in startup time specified between the two datasheets.
I see that the TPS78401 goes to 95% of Vout rather than 90%, but the datasheet states that the start time for the TPS73401 is <60us while the TPS78401Q is ~500us.
What is the reason for this large difference? We are looking at this as a possible replacement part for constrained inventory.
Thanks,
Cameron
Hi Cameron,
Some devices have built-in soft-start that slows the ramp time for a more controlled startup that limits inrush current, and some devices also have a delay after the supply comes up for a similar effect.
In this case the TPS784-Q1 has an internal soft-start:
Regards,
Nick
Hey Nick,
Good to hear from you! One quick follow up question prior to closing the thread - I assume we can't disable the internal soft-start time? I only see it mentioned in the header of the datasheet for the TPS784.
Thanks,
Cameron
Hi Cameron,
Likewise!
That is correct. There's no way to disable the internal soft-start.
Regards,
Nick