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Original question:

TPS2595: current pulses at startup

TPS2595: TPS259540 rise time formula

Brian Chan
Expert 6520 points
Part Number: TPS2595

Tool/software:

Hi Team

do we have any rise time formula can be reference? because I think datasheet only have Slew rate formula.

BTW may I know what is the difference between Slew rate and Rise time?

BRs

Brian

  • 0
    TI__Mastermind 39015 points

    Hi Brian,

    Apologies for delayed response.

    Slew rate and rise time depend on each other. 

    rise time by definition is time taken for Vout to go from 10% or 90%. So the delta V is 0.8*Vin. Slew rate is slope for this rise.

    SR = 0.8*Vin/rise_time. 

    If you see above, for 5V, 3.3nF dvdt cap, you have 11.6 V/ms slew rate which gives rise time of 345us which is very close to rise time of 349us given in the table. 

    Best Regards,
    Arush