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INN3164C Mosfet CD value

Posted by: Arge on

Hello PI Support Team,

I am using INN3164C in a project. Can you tell me the mosfet CD value for the transformer formulas? I couldn't find the CD or COSS values in the datasheet.

 

Thanks,

Arge

Comments

Submitted by PI-Heidi on 12/09/2022

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

Submitted by Arge on 12/10/2022

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

 

Attachment Size
Fig23.PNG 49.05 KB
Submitted by PI-Heidi on 12/12/2022

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

Submitted by Arge on 12/12/2022

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

Submitted by PI-Heidi on 12/19/2022

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