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isolation amplifier

Other Parts Discussed in Thread: ISO124

Dear Sir, please answer

 I have 25-32 V DC voltage and I need to pass this voltage through galvanically isolated circuit with breakdown voltage 600 V.  This circuit should ensure a linear transfer. Please, help me. Can I use precision linear optocoupler?

Please, report, how to attach any file to the post?

TIA.

Sincerely,

Vladimir Naumenkov

www.agat.by

  • Hello Vladimir Naumenkov,
    My recommendation would be to look at the ISO124 for your application.
    In order to attach files to the post click on "Use rich formatting" on the lower right side of the forum screen.
    Best regards,Jose
  • Dear Jose, thank  you

    1) Please, explain, does it make sense in power supply +/-18V of the ISO124, if the input/output voltage is +/-10V only?

    3) If I use TIL300A,  I seem to be able to use:  

    1Vcc+ = 35V;

    1Vcc- = 0V;  

    2Vcc+ = 35V;  

    2Vcc- = 0V; 

     Vi = 25-30V ?    Since I have the input voltage 25-30V. Or TIL300A (in compare with Op Ampl) has a big error? 

    TIA

    Sincerely,

    Vladimir Naumenkov

    www.agat.by

  • Hello Vladimir Naumenkov,

    For the ISO124: one needs to provide enough power supply to be 5 volts in excess of the maximum desired output. please refer to the following forum post for example:

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/297896/1041493

    You cannot use the ISO124 by connecting GND1 to -VS1; the part needs to have some voltage between GND1 and -VS1 (and the same is true for the GND1 and - VS2). Figure 21 of the ISO124 datasheet show a potential approach for this.

    The TIL300A would be an option, except that it is now an obsoleted part. However, I do not think one can get the output to swing down to the rail without providing a bipolar supply.

    Best regards,

    Jose