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LMP8645MKEVAL: LMP8645MKEVAL

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Part Number: LMP8645MKEVAL

Hi,

I am using LMP8645MKEVAL current sensor in my design to check activity on the BUS, My signal frequency is in between 30K to 40K. In burst mode means signal (30KHz) then ideal for some time (10ms) then again signal (30Khz). The bus is at 1.6V DC & AC signal of 30-40Khz is superimposed on this. I am monitoring the BUS by amplifying the signal across the sense resistor but unable to set the gain of LMP8645MKEVAL.
If I use 20K as Rgain then as per graph gain should be 4 but I am getting gain 2. Can you help to fixed the gain in my application.

Sense resistor 29 Ohms, Max Voltage across - 440mV. It will go as low as 200mV I need gain of 4 In my application

  • Hello Ganesh,

    Thank you for using the TI forum. I have a few questions for you.

    Have you tried testing the gain with only a DC signal? If so, do you still have gain problems?

    Try measuring the voltage differential right at the IN+ and IN- pins of the LMP8645, are they what you expected?

    Could you send me your schematic?

    Best Regards,

    Mitch M, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

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    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs. All information in this correspondence and in any related correspondence is provided "as is"  and is subject to TI's Important notice and disclaimer.

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