Linear optocoupler

crutschow

Joined Mar 14, 2008
34,285
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,
So you are just sensing the DC from the output and sending it back to the control circuitry.
That is a slow loop and does not require high speed response (a few kHz should be adequate).
Instead of trying to make the opto very linear to transmit the actual output voltage, you can put the voltage error reference circuit on secondary side of the circuit.
That way the gain or accuracy of the opto is not critical since it's inside the feedback loop.
Here's an example using a TL431 as the secondary voltage error circuit.
 

Alec_t

Joined Sep 17, 2013
14,280
can you please help me how to converted to model
1) Open the text file with Wordpad (not Notepad).
2) Copy the 39 lines of text from the from the line which reads 'CNR200 Linear Optocoupler SPICE Model' to the line '.ENDS', inclusive.
3) Paste that text into a new plain text file. This is now your model file.
4) Save the file as 'CNR200.sub' in either the folder where you keep your LTS .asc files or in the LTS folder ....\lib\sub.
5) Copy my attached symbol file into either the folder where you keep your LTS .asc files or into the LTS folder ....\lib\sym\optos.
 

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