INN3164C Mosfet CD value

Hello Arge, 

Thanks for reaching out to us. Please refer to Figure 23 (Coss vs Drain voltage curve) of InnoSwitch3-CE datasheet for the drain capacitance value. 

I hope this helps.

Thanks, 

PI Team

Hello PI-Heidi,

According to Figure-23, when I calculated the scaling factor for INN3164C as 1.95pF, I found approximately 3x1.95=5.85pF for Drain voltage 550V. Can you confirm this?

Could you share the calculation formulas for transformer design for INN3164C?

Thanks,

Arge

Hello Arge,

The drain capacitance calculations seem correct to me. 

Regarding the transformer and power supply design, we recommend you to use our PI Expert Online tool [PI xls tool]. 

Please let us know if you have any questions.

Regards,

PI Team

Hello PI-Heidi,

When using PI Expert, we choose my maximum frequency at minimum voltage and full load for transformer calculation? I'm asking to confirm this.

Thanks,

Arge

Hello Arge,

Yes, the power supply switches at the maximum frequency with full load, low input voltage and minimum primary inductance tolerance.

I hope this helps you.

Thanks,

PI Team