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BQ27546-G1: Can the IC handel fast changing currents ?

Rene Grabher
Prodigy 10 points
Part Number: BQ27546-G1

Tool/software:

Hello

Is the bq27546-G1 able to measure fast change currents accuratly?
We have a 300Hz rectangular discharge current.

the ic samples only with 1s intervall, so we are not sure if there are problems regarding the Nyquist-Shannon sampling theorem. we think yes.
maybe the ic samples only the low current timeslots?

thx for help
regards rene

  • 0
    TI__Mastermind 37751 points

    Hello Rene,

    Can you show an example waveform of the current (make sure to include timing). The gauge is going to read out a current value every second so the biggest concern is that the gauge will "miss" a lot of the current if it is rapidly changing. Depending on the duty cycle of the current could make it more favorable for a gauging perspective.

    Regards,

    Adrian

  • 0 in reply to Adrian
    Prodigy 10 points

    Hello Adrian

    thank you for the answer, below you will find a sample discharge current.

    the frequency will slightly change with the temperature. so we can not guaranty always the same frequency. also the duty cycle will change depending on the user dimming level of the leds (its a led flashlight project).

    thx.

    regards rene

  • +1 in reply to Rene Grabher
    TI__Mastermind 37751 points

    Hello Rene,

    Looking at the current, it is changing very fast. We can not guarantee good accuracy for our gauges with Impedance Track with such a fast changing load profile. We do have a new product coming out that will incorporate our new Dynamic Impedance Track algorithm (DZT). This algorithm should offer more accurate gauging for this type of load profile. You can check out the gauge on this page: https://www.ti.com/product/BQ41Z50

    Regards,

    Adrian