Linear optocoupler

Discussion in 'General Electronics Chat' started by karas, Oct 3, 2016.

  1. karas

    Thread Starter Active Member

    Sep 8, 2011
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    Is there is another cheapest way instead of using linear optocoupler like il300 and do the same function
     
  2. 64C113M Abe.

    New Member

    Sep 13, 2016
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    How about, Led attached to a photocell via a heat shrink tube?
     
  3. karas

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    Sep 8, 2011
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    I need to be linear
     
  4. ronv

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    Nov 12, 2008
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  5. crutschow

    Expert

    Mar 14, 2008
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    Here's a little blurb I wrote on that very subject.
     
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  6. karas

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    Sep 8, 2011
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    Is this ok if I use it to sence the voltage feedback, it will be very fast response to the input
     
  7. karas

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    Sep 8, 2011
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  8. crutschow

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    I have no idea.
    What is "very fast"?
    What are you trying to do?
    What signal are you trying to send through the opto?
     
  9. karas

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    Sep 8, 2011
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  10. karas

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    Sep 8, 2011
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    I need to sense the voltage feedback , that why I need the sensed voltage linear and fast response
     
  11. hp1729

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    Nov 23, 2015
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  12. Sensacell

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  13. crutschow

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    That tells me nothing useful.
    Is "fast" milliseconds, microseconds, nanoseconds, picoseconds...?
    Sense voltage feedback from what?
    Please answer my questions in post #8 if you want any further help.
    Post a diagram of what you are trying to do.
    You lack of more specific information makes it impossible to help you further. :rolleyes:
     
  14. Bordodynov

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    May 20, 2015
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    See
    Draft339.png
     
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  15. hp1729

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    Over what range do you need linearity? Input voltage, output voltage, current, resistance? You might find something with a workable region.
     
  16. crutschow

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    That also uses a specialized opto isolator which the OP wants to avoid.
     
    Last edited: Oct 5, 2016
  17. karas

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    Sep 8, 2011
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    Sorry Crutschow,
    This basically DC DC bidirectional ,the input to the primary is 40-100VDC and the output from the secondary is 500-1000VDC ,the switching frequency is 65Khz ,i need to sense the output voltage from the secondary side, the control is in the primary side,
     
  18. karas

    Thread Starter Active Member

    Sep 8, 2011
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    Can i get the LT spice model for the linear opto coupler HCNR200, is this you create it or you download it?
     
  19. Alec_t

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    The model can be found here.
     
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  20. ian field

    Distinguished Member

    Oct 27, 2012
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    Its described in some appnotes - you need 2 optocouplers; one is your isolated signal path, the other is the feedback loop controlling the op-amp driving the IRLEDs. The 2 IRLEDs are in series so they carry identical current.
     
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