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Current surge during start up in non isolated DC-DC converters

Anjan Kumar.N
Prodigy 100 points
Other Parts Discussed in Thread: TPS54810

We are using TPS54810 device in our design. 

My question: during the design of the circuit/external components should we consider surge current requirement also?

IS it sufficient to consider the steady state current requirement of the circuit. 

How to decide the current requirement of the circuit?

  • 0
    TI__Guru**** 191445 points

    If by surge current you me step load change, the answer is yes.  You will need additional capacitance on the output to supply the instantaneous load current change and you will need to ensure the peak current is lees than the minimum specified current limit.  If you post your requirements, I can take a look.

  • 0 in reply to JohnTucker
    Prodigy 100 points

    We want use this TPS54810 to power virtex-5 lx series XC5VLX330 FPGA. We are using for powering Vccint i.e 1.0 V with current rating of 3.8 A. In this case should we consider 3.8 A as the peak current limit or should we use traditional thumb rule of multiplying this by 3, i.e 3.8 x 3 = 11.4 A as peak current. So what should be the design parameter with respect to output current limit.

  • 0 in reply to Anjan Kumar.N
    TI__Guru**** 191445 points

    The minimum current limit of the TPS54810 is 9 A, 11-12 A typical.  As far as the peak current requirement of the XC5VLX330, I really do not know.  You might consult with the maker of that FPGA for their recommendation.