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how to connect TPS54319 SS/TR pin

Sean ZHang35753
Intellectual 2060 points
Other Parts Discussed in Thread: TPS54319

How to connect SS/TR pin when my customer will not use Slow start function of TPS54319?

  • 0
    TI__Guru**** 150900 points

    To start as quickly as possible, leave the SS pin unconnected (floating).

    MAKE ABSOLUTELY SURE THAT YOUR CUSTOMER TESTS THIS CONFIGURATION ON THE EVM BEFORE GOING TO PRODUCTION.  If any converter starts without soft-start, there is the risk of crashing the input bus due to the large currents that will be drawn from it, as well as the output overshooting possibly.  It is imperative that your customer test their final circuit in their system, especially if it does not include soft start.

  • 0 in reply to Chris Glaser
    TI__Guru**** 191445 points

    I'm not sure I would recommend that for TPS54319.  You are free to try it though.  I would expect erratic start up, with current limit active.  I may give it a try tommorow or Monday.