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TPS61376: Changing ILIM dynamically

Austin Allen
Intellectual 2435 points
Part Number: TPS61376

Hello team,

My customer is wondering if the ILIM of the TPS61376 can be changed dynamically (i.e. after the device has started up already with a given current limit).

For example, if part way through operation the RILIM1 resistor is switched to a different RILIM2 would the ILIM change or is this only performed at device start-up?

Also, is this reading of the RILIM done via a voltage measurement? Could a DAC be used in this case to control ILIM?

Best,

Austin Allen

  • 0
    TI__Expert 7370 points

    Hi Austin,

    Theoretically, the ILIM of the TPS61376 can be changed dynamically by switching the RLIM. Because of the response time of the loop, the customer should pay attention to the dynamic regulation process to ensure the current oscillation is acceptable at the switching moment.

    The reading of the ILIM value is by monitoring the current through RLIM as reference. So we cannot use a DAC to control ILIM.

    Regards,

    Mulin

  • 0 in reply to Mulin Yuan
    TI__Intellectual 2435 points

    Hi Mulin,

    Could you clarify a bit about how the current is measured through RLIM? From the block diagram, it almost looks like the voltage generated by ILIM across RLIM and comparing it to a reference voltage but I could be misinterpreting

  • 0 in reply to Austin Allen
    TI__Expert 7370 points

    Hi Austin,

    Vref is an internal voltage signal. It is Vref generates the ILIM through RLIM not ILIM generates Vref across RLIM. The generated ILIM is monitored by internal current mirror and used as input current limit reference.

    Regards,

    Mulin