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TPS54160: How does it drive high inrush currents?

Wade Baker
Prodigy 70 points
Other Parts Discussed in Thread: TPS54160

I am going to be using this supply to power a microprocessor board of some complexity.  The output of the supply will be subjected to a large inrush current at power up due to all of the decoupling and reservoir capacitance on the board.  I have read through the data sheet several times but I have not found a clear answer as to how the part will react to it.  Will it go into constant-current mode and allow the output voltage to drop until the overcurrent requirement is met or will it go into a hiccup mode and never reach a regulated voltage output?

Thanks!

  • 0
    TI__Guru**** 191445 points
    TPS54160 uses pulse by pulse current limit. There is no hiccup mode. When the current limit is reached, the output voltage begins to fall. How much and what type of capacitance are we talking about? You will probably also need to take that into account for the loop compensation and SS timing.
  • 0 in reply to JohnTucker
    Prodigy 70 points

    Thank you John for your quick reply :-). 

    The board comes up in stages.  The 1st stage is the 3.3 and 5 volts.  This stage has 330µF of bulk electrolytic capacitance and approximately 5µF in 0.1µF decouplers.  The second stage, which comes on about 1 second later, is 12 volts.  It has about the same bulk capacitance and about 1/4 of the 0.1µF capacitance.  The TPS54160 is fed by 55 volts and produces 12 volts out at approximately 1 amp.