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LM5143: The impact of VCC powered internally

Rannie Zhou
Expert 4220 points
Part Number: LM5143

Tool/software:

Hi team,

Can you help to confirm what's the impact if VCC be powered internally, that is, VCCX connected to AGND?

BRs,

Rannie

  • 0
    TI__Guru 74052 points

    Hi Rannie,

    If VCCX is not powered, then the VCC bias rail is provided by the internal VCC subregulator. The power dissipation in the IC is Vin*Ivcc, where Ivcc is mainly the current to drive the FETs, which is Qg*Fsw for each FET.

    Regards,

    Tim