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TPS2660: 2-level Current Limit

ReedKacz
Expert 3462 points
Part Number: TPS2660

Hi Team,

I have a need to use the TPS26600 on a 24V power supply with the current limit set to 1.5 Amps. The downstream load that is connected enters a known high current spike 4 seconds after powered on.The load goes up to 1.8 Amps at 4 seconds after power up and then drops down to normal operation within 1 second.

I would like to use the TPS26600 so that the current limit is at 1.5 Amps. I need to adjust for a short period of time to allow the 1.8 Amp load to pass.

Do you all have a method to do so? Switching in a second ILIM resistor? Using a digital potentiometer? Using a DAC into ILIM?

Let me know your thoughts!

Thanks,

  • 0
    TI__Genius 16305 points
    Hello Reed,

    All the three methods will work, however switching a second ILIM resistor will just fit the requirement.
    Having digital pot or DAC into ILIM will consume space and cost respectively and are mostly used for applications where multiple current limits are used or programming from MCU is needed.

    For 1.5A, 8K ILIM resistor is needed and for 1.8A, 6.67K ILIM is required.
    Having 8K in parallel to 40k will give 6.67K --> 1.8A ILIM and can switch out the 40K to get 1.5A ILIM.

    Regards,
    Kari.