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Opto coupler selection for LNK TN family switcher (buck converter)

Posted by: bibha on

Hi all,

I'm designing a small smps based on LNK3204 or LNK304. For this I choose the opto-coupler feedback as described on page pp.6 (https://www.power.com/sites/default/files/product-docs/lnk302_304-306.pdf)

The question is : What are the opto coupler parameters selection (CTR, Ton/Toff, Vf, ... etc) ?

Best regards,

Comments

Submitted by bibha on 12/11/2021

Hi,

 

Thanks for the Toshiba reference. Could you be so kind to point me some calculation on regulation process where CTR opto-isolator is involved inLNK Family controllers ?



The input current Ifb of your LNK Famly is something Ifb=49uA, please could you provide us some equations or best any Spice model of the controller in order to simulate the overall regulation behaviour



Best regards, H

 

Submitted by PI-Chloe on 12/21/2021

Hi Bibha, 

Good day! 

Please attach file for your reference. 

Thanks 

Regards 

PI-Chloe 

Attachment Size
Opto Feedback.png 40.8 KB