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UCC28730-Q1: Minimum On time requirement

Ponkamali P
Prodigy 100 points
Part Number: UCC28730-Q1


Tool/software:

Hi,

According to the datasheet, the minimum ON time of the MOSFET should be greater than t-csleb (leading edge blanking time). 

For my application, the design calculator suggests ~700uH of primary inductance, but the corresponding min on time is 75ns which is less than t-csleb of 280ns.

Can I choose a higher inductance than the recommended one to match the minimum on time requirement?

The issue I am seeing with using higher inductance is increased leakage inductance.

 

Any recommendations on how to navigate this situation?

Thanks 

Ponkamali P

  • 0
    TI__Guru* 86286 points

    Hello,

    You can select more inductance for your design it is just going to reduce the maximum switching the converter can run at.

    I would suggest keeping the maximum switching frequency above 38 kHz.  In this way you can use the full control law in your design.

    Thank you for interest in Texas Instruments (TI) products.  If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question

    Regards,