SN6507DGQEVM: Tech question on Transformer Design

Brian Wang0928

Genius 15080 points

Part Number: SN6507DGQEVM
Other Parts Discussed in Thread: SN6507

Hi Team,

Customer currently working with the SN6507 and have the following technical questions:

Transformer Inductance Calculation – The datasheet provides the turn ratio formula, but does not explain how to calculate the transformer inductance. Could you please clarify the methodology? You may refer to the SN6507EVM, its transformer inductance is about 500uH made by Bourns show below .

Inductance vs. Switching Frequency Relationship – What is the relationship between the transformer inductance and the switching frequency setting? Alternatively, how should the switching frequency be designed based on a given inductance value?
Output Power vs. Frequency & Inductance – What is the relationship between output power, switching frequency, and transformer inductance? How do these parameters interact in the design?

Any guidance or reference material would be greatly appreciated. Customer need exactly calculation. Please offer the calculation example. thanks.

Regards

Brian

1 month ago

0 Brian Wang0928 1 month ago

TI__Genius 15080 points

Could team helping with this urgent case! Very thanks!

0 Prateek Verma 1 month ago

TI__Intellectual 2160 points

Hi Brian,

I'll look into your query and will reach back to you shortly.

Thanks,

Prateek

0 Prateek Verma 1 month ago in reply to Prateek Verma

TI__Intellectual 2160 points

Hi Brian,

Below document includes Complete push-pull converter design. It has all the formulas with example.

/cfs-file/__key/communityserver-discussions-components-files/1013/Push-Pull.pdf

It has transformer inductance calculation.

Regards,

Prateek

0 Brian Wang0928 1 month ago in reply to Prateek Verma

TI__Genius 15080 points

Hi Prateek,

Thank you for your comments. However, the question you addressed was not the one the customer exactly raised. Could you please help answer the specific technical question the customer asked in the previous thread, related to the SN6507EVM inductance design and selection?

Your support on this at the earliest would be greatly appreciated.

Best regards, Brian

0 Prateek Verma 1 month ago in reply to Brian Wang0928

TI__Intellectual 2160 points

Hi Brian,

1. Relationship between Inductance and switching frequency:

you can choose what magnetizing current you want and then by fixing Fsw, D and Vin you can calculate required transformer primary inductance.

2. For a given size and weight, you can push more power through a transformer simply by running it at higher frequencies. While increasing the switching frequency boosts power capacity and shrinks the components, it introduces switching loss, core loss and EMI issues.

For detailed design of Transformer for push-pull converter see - 11) Transformer design

Thanks,

Prateek

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SN6507DGQEVM: Tech question on Transformer Design