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I am taking feedback using TL431 and opto coupler with type 2 compensation as shown below.
I am using the following transfer functions:
1. TL431 transfer function:
Opto coupler Transfer function:
I have few more doubts in the transfer functions;
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In reply to Michael J Schultis:
I am considering to use UCC2802 to design a flyback.
1) Can I use the same transfer function in the slua671.pdf (for UCC28600) for my UCC2802?
2) The CTR (Current Transmission Rate) of opto coupler has a big range with temperature. So, CTR value will change dramatically when the operation temperature change. Since compensation calculation is based on the CTR, does that mean that the circuit could go into unstable status if temperature changes
Thanks and Regards
In reply to Naiwu Yuan79:
The article by Ridley at http://switchingpowermagazine.com/downloads/15%20Designing%20with%20the%20TL431.pdf
should be helpful.
please let me know if you need any further clarification
In reply to Colin Gillmor:
Many thanks for your answers about the CTR and very useful article "Designing with the TL431".
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