LM5022: Flyback transformer auxiliary winding

Hi Ronald,

Thank you for using the LM5022. Yes you can remove the auxiliary winding. It just produce a bias voltage so the VCC can take power from this winding instead of the internal VCC regulator (LDO). When you input voltage is 56V, the internal LDO may have more power dissipation. If you want to minimize the power dissipation inside the IC, which is recommended, you should have the aux winding. As said, removing the winding the circuit should work, just a matter of efficiency at high Vin.

Thanks,
Youhao Xi, Applications Engineering