Hii Everyone
I am using the LM5021 PWM controller for the design of a 24 V, 90 W AC-DC converter. What is the purpose of using Zener diode (Dreg) and capacitor (Creg) used in voltage divider circuits?

Thanks and Regards
Abhishek
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Hii Everyone
I am using the LM5021 PWM controller for the design of a 24 V, 90 W AC-DC converter. What is the purpose of using Zener diode (Dreg) and capacitor (Creg) used in voltage divider circuits?

Thanks and Regards
Abhishek
Hi, Abhishek:
This is an opinion circuit.
When Vo is over VDreg, the VDreg conducts, the current flows through Rreg and Dreg as a dummy load to regulate output voltage.
Thanks
Regards,
Wesley