non-isolated flyback Auxiliary winding

[NXTY_Miyashita]

In the non-isolated flyback circuit example of Gen5 ICE5xSAG and ICE5ARxxxxBZS, can Wa and Wp1 of the auxiliary winding be used as one?
I think I can insert a diode to split the VCC and FB paths, and the voltage required for FB can be adjusted with a resistor.
Please let me know if there are any disadvantages to using both auxiliary windings.

[Kieran_Pan · Accepted solution]

Hello,

You'd better not do that cause Wa is used to provide the power to the chip and Wp1 is used to get the feedback of the circuit. If you only use one auxiliary windings which may caused inaccurate feedback value and unstable chip power supply.

Best regards,
Kieran 

[NXTY_Miyashita]

Thank you for your comment.
I understand.