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TIDA-01540: Current sensor power supplies and overload protection working scheme in TIDA01540

Utsav Sharma12
Intellectual 420 points
Part Number: TIDA-01540
Other Parts Discussed in Thread: TL431

Hello Team TI,

I have following three questions regarding TIDA01540.

Can we provide 5V supply in place of red encircled part?

What is the use of 1.65V in blue encircled part?

How overload protection circuit works?

Thank You

  • 0
    TI__Prodigy 425 points

    Hi Utsav,

    Did you intend to add an attachment to this inquiry? If so, could you please send it again. I cannot see any graph or attachment for some reason.

    Best regards,

    Michael

  • 0
    TI__Prodigy 550 points

    Dear Utsav, 

    I guess there should be a picture with your post, similar to this thread from you: https://e2e.ti.com/support/tools/sim-hw-system-design/f/234/t/880913

    Please kindly provide the picture/schematics for this question. 

    Thanks

    Ingolf

  • 0 in reply to Michael Seidl
    Intellectual 420 points

    Sorry, I forget to attach screenshot here. Kindly find the attachment for the above questions here.

  • 0 in reply to Ingolf Frank
    Intellectual 420 points

    Thanks for your reply sir. Kindly find the attachment in the following reply.

  • 0 in reply to Utsav Sharma12
    TI__Prodigy 425 points

    Hi Utsav,

    Thanks for the picture. That helps.

    Can we provide 5V supply in place of red encircled part?

    Well, yes, but I am not sure if I truly understand why you would like to do that. Please note that this is already a 5V supply referenced to the switch node. Please refer to the data sheet of TL431, "Figure 27. Shunt Regulator Schematic". Further, this is the "hot side" and an external supply would need to be isolated, as well! Please be careful in not connecting any grounds unintentionally! This can be dangerous!

    What is the use of 1.65V in blue encircled part?

    This reference belongs to the circuitry above which converts the differential signal into a single ended signal (0..3.3V). The reference of 1.65V is the mid-point.

    How overload protection circuit works?

    This is a window comparator for the single ended signal. The transistor network 20, 21 and 23 defines the window. Very high and very small signal levels trigger the overload output.

    Best regards,

    Michael

      

  • 0 in reply to Michael Seidl
    Intellectual 420 points

    Hello Mr. Michael Seidl

    First of all, thank you for your prompt reply.

    I am developing modules for my work viz, current sensor module, voltage sensor module, protection module and power supply module etc. These modules will interact with each other on the docking station module. So, to ensure safety and to save my time due to errors I want to clarify each module. 

    I want to provide 5V supply to the primary of current sensor because I developed a module in which 5V supply is isolated from the 3.3V and 1.67V. So I want to give 5V to the primary and 3.3V and 1.67V to the secondary. 

    Your answer resolved my issue. Thank you once again.