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LM5122: What is LM5122 Ivcc, or VCC operating current?

Stephanie Hibler
Prodigy 725 points
Part Number: LM5122

I Ivcc "operating current" the same as quiescent current for the VCC regulator in this case?

From reading some other posts do I understand correctly that the Ivcc during operation is QG*Fsw? Is Ivcc here simply a kind of "quiescent current" for the internal VCC regulator?

Thank you very much!

  • 0
    TI__Guru* 78440 points

    Hi Stephanie,

    The LM5122's Ivcc is determined by the external MOSFETs it drives.  Bascially,

    Ivcc = 8mA + Qg_total x Fsw

    Where 8mA is the max current taken by IC logic excluding the gate driver consumption, and Qg_total is the total gate charge of both MOSFETs, and Fsw the switching frequency.  Note that Ivcc should not exceed 50mA  per datasheet Vcc current limit. 

    Thanks,

    Youhao Xi, Applications Engineering