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TPSM63610: Relation for suggested fsw range

Satoshi
Guru 19645 points
Part Number: TPSM63610

Datasheet P15 is described recommended fsw range.

Would you please let me know the background that is set for this frequency range?

Are there any concerns about using fsw outside the recommended range?

In addition, I was able to simulate at 1.928MHz with Webench Design of 12Vin → 3.3Vout/4.5A.

Is there a problem here?

WBDesign74_TPSM63610RDFR_12V-3.3V4.5A.pdf

Best regards,

Satoshi

  • +1
    TI__Guru 50120 points

    Hello Satoshi,

    Given that this power module has an integrated 2.2uH inductor, the frequency limitation range is set to be such that for a particular output voltage the inductor ripple ratio (K) is within 10% to 40% of the maximum load current while in CCM such that it is a reasonable peak-to-peak ripple current.

    However it should not be a problem to operate it outside of the recommendation in the table. It will just have worse thermal performance and efficiency because it's operating at a higher frequency.

    Regards,

    Jimmy