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LM5141: LM5141QRGERQ1

Shiva Rudrappa
Prodigy 60 points
Part Number: LM5141

Hi,

What is the current drawn by LM5141 during the light load condition  and in the design the DEMB ( diode emulation ) pin pulled High for the continues operation (FPWM). 

  • 0
    TI__Guru 74382 points

    HI Shiva,

    If the controller operates in FPWM, then the VCC current (and thus the VIN current) is mainly what's required to drive the power MOSFETs. This is effectively Qg*Fsw for each FET, where Qg is the MOSFET gate charge at Vgs = 5V. The controller quiescent operating current will be insignificant relative to this gate drive DC current consumption.

    I recommend filling out the LM5141 quicktart calculator to check this design.

    Regards,

    Tim