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LM5017 in Fly-back topology Opto-Feedback

Expert 3040 points
Other Parts Discussed in Thread: TIDA-00129, LM5017

Hi,

I am supporitng industrial customer in Japan, customer needs isolated 26V/30mA and 5V/20mA from Vin 24V which ranges 20.8V to 28.8V.

I am considering using TIDA-00129 which is similar design and I can use this with minor changes.

Based on this design, I have concern about output voltage accuracy, because the accuracy of 26V requires +/- 100mV Vpp ripple.

In this design, since this is primary-side regulation, I would like to use secoundary-side regulation by using optocoupler to get more accuracy.

Can we use the FB pin that receves feedback signal from secoundary side via optocoupler?

 Best Regards

Naoki Yada