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TPS54160: Delayed start with EN or Slow Start SS pin

Darren Jenkins
Genius 12491 points
Part Number: TPS54160

TPS54160 team,

We have a customer using TPS54160 who needs to delay the rise of the output voltage.  Input is typically 45VDC.  Output is 12VDC.  As the input gradually rises past 26VDC, they want the output voltage to rise 700 ms after the input passes 26VDC.  It's a delayed start rather than a slow start.

Would you recommend some sort of delay circuit implemented on the EN pin, or is there a creative way this should be done with the SS feature (Slow Start / Soft Start)?  Do you have any example circuits?

Thanks,

Darren

  • 0
    TI__Expert 4100 points
    Hello Darren,
    There are several different ways to delay start up when using TPS54160.
    Device datasheet describes in detail how to do this for various startup scenarios.
    So please review datasheet (section 9.2.2.6) with detailed explanation. The link to datasheet is below
    www.ti.com/.../tps54160.pdf

    However, you requirement to delay start for 700ms may be hard to achieve , since soft start capacitor for this condition would get large.
    For this reason i would suggest using some sort of delay on enable pin.

    Best regards
    Brani
  • 0 in reply to Brani Dubocanin
    TI__Genius 12491 points

    Hi Brani,

    I was hoping we might have some specific examples whether for this device or another similar one.

    The SS pin will give a defined voltage slew rate, but will not delay the start.  The customer needs to delay the start, and then after that the output voltage can rise based on the load capacitance and resistance. 

    It looks like we all agree that implementing a delay circuit on the enable pin makes the most sense. I'll think about an op amp circuit.  If you find something, especially if it is tested, please do share.

    Thanks,

    Darren