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TPS53515: Snubber circuit for SW pin

Hirokazu Takahashi
Expert 8420 points
Part Number: TPS53515


Dear Support team,

We could find C1 470pF and R3 3ohm between SW and PGND in Figure 43 of Datasheet P23.

And datasheet describes it as the recommendation placing a snubber.

Are there any case for adjusting the snubber circuit parts?

How should we adjust them in that case?

If snubber circuit will be removed from SW pin,  are there any problem for the performance or any critical damages?

Best Regards,

Hirokazu Takahashi

  • 0
    TI__Mastermind 25120 points

    TI recommends placing a snubber between the SW shape and GND shape for effective ringing reduction. The value of snubber design starts at 3 Ω + 470 pF.

    The absolute maximum voltage rating of the VIN and SW are 

    TPS53515

     

    MIN

    MAX

    UNITS

    VIN

    -0.3

    30

    V

    VIN-SW DC

    -3

    30

    V

    VIN-SW < 10 ns transient

    -5

    32

    V

    SW

    –3 

    27

    V

     

    The snubber should keep the voltage less than the ratings in the abs max table