Capacitor at The AUX

[tensaisakuragi06]

Hi, i design a SPMS with VIPER013HS and in the design schematic, i dont know the purpose of the capacitor in attached picture. Also in design, there is no capacitor value mentioned for this capacitor.

[Peter BENSCH]

It's a so-called Y-capacitors for common mode rejection and EMI filtering. Depending on the design of the transformer, this may not be necessary, e.g. with grounded metal foil between the primary and secondary winding.

Does it answer your question?

Regards
/Peter

[tensaisakuragi06]

It satisfies my curiosity. Thank you.