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DRV8870: Question about Isen pin of DRV8870

Satoshi
Guru 19645 points
Part Number: DRV8870

Please let me know about two points below of Isen pin for DRV8870.

①I think that power dissipation for Rsense can calculate below, is it correct?

   Pd_Rsense = Itrip^2 × Vref

②Datasheet page-3 is described "Transients of ±1 V for less than 25 ns are acceptable".

　Which is correct below?

　⇒case-1) If exceed 1V rating, ±1V/25ns transient is OK 

　　case-2) Isen can't exceed 1V and transient should be less than ±1V/25ns

Best regards,

Satoshi

  • 0
    TI__Guru** 114905 points
    Hi Satoshi-san,

    ①I think that power dissipation for Rsense can calculate below, is it correct?

    Pd_Rsense = Itrip^2 × Vref

    I think you meant Pd_Rsense = Itrip^2 × Rsense. The power dissipation should be less than this because the RMS current is typically less than Itrip.

    ②Datasheet page-3 is described "Transients of ±1 V for less than 25 ns are acceptable".

    　Which is correct below?

    　⇒case-1) If exceed 1V rating, ±1V/25ns transient is OK

    　　case-2) Isen can't exceed 1V and transient should be less than ±1V/25ns

    Case 2 is correct.