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LMP8645: Questions about LMP8645 output low response issue

Jacky Wang(QD)
Genius 10940 points
Part Number: LMP8645
Other Parts Discussed in Thread: INA296A, INA293, INA290, INA296B, INA280, INA281

Hi Team,

Customer is using LMP8645 for one square wave current sensing, during the debug, they found the VOUT response of LMP8645 is very slow as below picture showing. Can you help to check if this is the normal behavior for our device? Any ideas for such problem?

1. Customer's application schematic:

2. Test waveform(VOUT measuring before R-C, even we removed the output R-C, it shows the same low response output):

Thanks.

  • 0
    TI__Mastermind 29870 points

    Hello Jacky,

    As you increase the Rg the bandwidth of this device goes down.  This device is limited by the bandwidth.  If you need faster response please use the INA296A or INA296B, INA293 or INA290, INA281 or INA280.  I know they do not have the selectable gain but the accuracy is good on some of them you may not need it.

    Regards,

    Javier