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DRV8243-Q1: The relationship between the tpd and slew rate

Tommy Shao
Prodigy 20 points
Part Number: DRV8243-Q1

Tool/software:

Hi Experts:

I have some questions about the SlewRate setting and the corresponding propagation delay (tpd).

From the description in the datasheet,  the tpd is the time between the failling/rising edge of the input and the start point of the output switching, it seems that the tpd is no relative to the slew rate.

However, in terms of the spec like below : the tpd_LSoff is changable with the SR_LSOFF, and the tpd_LSon, tpd_HSoff ,tpd_HSon are also changeable.  

So i would like to know the relationship between the tpd and the slew rate since it is helpful for me to caculate the system's spec. 

 

  • 0
    TI__Mastermind 45075 points

    Hi 

    Thank you for your questions. SR settings changes the driving capability of FET rise/fall. To achieve faster slew rate (e.g 47V/us), it needs higher driving capability. Then tPD is slightly impacted-getting shorter with high driving capability settings.

    regards

    Shinya 

  • 0 in reply to Shinya Morita
    Prodigy 20 points

    Hi   Shinya

    Thanks for your quick reponse, so the spec is the test result of the bench, if i used the actual motor , the data will be changed . Am i right ?

    But the rule is that the tpd is proportional to the slew rate , the faster slew rate the shorted tpd,