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TPS61230 with 5 to 4.1V input

Russell Wetherley1
Expert 4255 points
Other Parts Discussed in Thread: TPS61230

Hello,

I have a customer who has an unstable 5V input that drops to ~4.1V that lasts for about a second, then shoots back to 5V.  He's looking at the TPS61230 to create a stable 5V rail and is asking for a simulation to see if the 61230 will stabalize at 5V.  Attached is a screenshot of the unstable input.  Can someone run a sim with an input close to this and post screenshots of the output, or advise on the best way to simulate it.

Thank you very much,

Russell

  • 0
    TI__Intellectual 2270 points

    Hi Russell,

    Can u share us with more information, L, CIN, COUT ,Iload etc. We can have a galance at EVM first to confirm if this issue exsits. thanks.

    Charles from Boost Converter Solutions

  • 0 in reply to Charles Wong1
    TI__Expert 4255 points

    Hello Charles,

    As of right now, the customer does not have a TPS61230 design.  He is trying to figure out if the 61230 will be able to stabalize the 5 to 4.1 voltage drop to his required constant 5V.  In other words, assuming an ideal load, will the TPS61230 work for stabalizing this input?  I tried simulating its PSpice model on cadence, but ran into issues getting the program to run properly.  I also tried exporting a schematic from webench to a cad tool, but that did not work either.

     

    Russell

  • 0 in reply to Russell Wetherley1
    TI__Intellectual 2270 points

    Hi Russel,

    got it. i think u can just do the simulation (input transient) with our webench calculator on TI official website. here are some captures from an design with VINmin=4.1V  VINmax=5V IOUT=500mA:

    select input transient in step1 option. then click VIN in the schematic to set rise/fall edge time. this VIN is periodic, may not generate the signal you posted yesterday.

    here is the result I did:

    VOUT can be stabalized at 5V.

    if more questions just let me know. thanks.