• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 243 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS7H3301-SP: Transconductance Screening

John Rodriguez
Prodigy 200 points
Part Number: TPS7H3301-SP

Hi Daniel,

In my prior question regarding "ESR requirement and stability" for this VTT regulator, you previously responded that the gm parameter is not tested to provide min/max characteristics in the electrical characteristics section. Furthermore you've also stated that all the cited values in the datasheet and excel calculator are typical values. There is variation of about 23% at 3A between those two resources (250S datasheet, 308S excel calculator ). In my analysis this variation is large enough to create problems for us at high loads across EOL tolerances without the RC filter. Is there a point of contact I can speak to regarding possibly screening these components for gm at various bias points? One way for us to address this would be to ensure that the gm of the parts we purchase is below a maximum limit.

Thanks,

John

  • 0
    TI__Mastermind 22155 points
    Hey John,

    Generally we do not do additional screening of our devices, and the times we have done it, the cost has been quite high.

    Would seeing gm data from multiple devices over bias current help your situation?
    I am trying to dig this data up if we have it.

    Thanks,
    Daniel
  • 0 in reply to Daniel Hartung
    Prodigy 200 points

    Hi Daniel,

    We may be in a situation where paying TI to screen parts is more cost effective. I'm not in a position to make that decision, but I was directed to inquire. Is it possible for you to comment on how much this screening has cost in the past (order of magnitude or a range)? Also is there a less public way to contact you outside of this forum to discuss this further?

    If you have gm data for multiple devices that would definitely be helpful. I can carry out 99/90 statistics on a sample size of at least 3. More (5+) would obviously be preferable as the sample size greatly influences the spread. Some other information would be helpful too, such as whether they are from the same lot/date code etc. That is if you can make it available of course.

    Thanks,

    John 

  • 0 in reply to John Rodriguez
    TI__Mastermind 22155 points
    Hey John,

    I will take this discussion offline as we will be able to discuss pricing/data.

    Thanks,
    Daniel