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Original question:

DRV8256: Ivalley value with Smart tune Ripple Control

DRV8256: Ivalley calculation

Nobuhiko Wasa
Intellectual 1070 points
Part Number: DRV8256


Team,

In case that Itrip set at low current, such as 100mA, and TOFF set to 0, the Ivalley can be calculated as follows;

Ivalley = 19mA + 99% * 100mA = 118mA

Ivalley is greater than Itrip. What happens at this kind of cases?

Thanks,
Nobuhiko Wasa

  • +1
    TI__Mastermind 20460 points

    Hi Nobuhiko,

    When using Smart Tune Ripple Control, the current will rise until it reaches ITRIP, then it will enter slow decay until the current level reaches IVALLEY. 

    The current regulation threshold, ITRIP, is to be set greater than IVALLEY. In the case that IVALLEY is greater than ITRIP the device will not exit slow decay. 

    Best,

    David