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High Speed Current Sense

eli
Guru 13485 points

Other Parts Discussed in Thread: OPA333, OPA836

looking for high-speed precision current sense monitor like MAX9643. It has very large input common-mode voltage (from -1.5V to +60V); relative high slew rate (12V/µS) and signal bandwidth of 10MHz.

 

 

  • 0
    TI__Genius 15770 points

    Hi Eli,

    Thank you for posting your question in our forum. The high-speed precision current sense monitor you are looking for is a unique part in the market. Currently we don’t have any current shunt monitor that matches, specification by specification, these features.

    Therefore, we have a variety of current shunt monitors in our portfolio and knowing about your application will help us to recommend a TI solution suitable for your intended usage.

    Could you please tell us more information about your application? In order to support you we need, at least, the following information:

    • Common Mode Voltage Range – How low/high of a range is needed?
    • Supply Range (Vs) – Low or high supply range?
    • Supply Current (Iq) – Is low power needed?
    • Offset Voltage (Accuracy needed)
    • Speed

     

    Mayrim Verdejo

    Analog Applications

    AIP – Sensing Products (Tucson)

    Desk: (520)-750-2540

    Cell:  (787)-368-6473

    mayrim.verdejo@ti.com

     

                           

  • 0 in reply to Mayrim Verdejo
    Guru 13485 points

    See below:

    • Common-mode voltage from 0V up to 70V.
    • Supply voltage is 2.7V – 5.5V.
    • Supply current is 1mA.
    • Offset Voltage is less than 1mV.
    • Speed is more than 10MHz
    • Slew rate is more than 10V/uS

     

  • 0 in reply to eli
    TI__Genius 15770 points

    Hi Eli,

    Thanks for reaching us to find a solution for your application. As we anticipated before, there is no current shunt monitor in our product line for the 10MHz speed requested.

    Although, looking at our applications notes we found a High-Side Current Monitor circuit that, probably, you can use as a guide to create your own current monitor with the specs you are looking for. (You can find this circuit in OPA333 datasheet, Page 10, Figure 23) http://www.ti.com/lit/ds/symlink/opa333.pdf

    For this circuit you will need a High Speed Amplifier. Looking at our products we found OPA836 (http://www.ti.com/product/opa836 ) which have: Supply Voltage: 2.5V to 5.5V, Quiescent Current: 1mA, high speed.  This is just a general idea, hope it can help or guide you in a good direction.

     

    - Mayrim