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LM5085: LM5085, VCC, REASON TO BE AC-COUPLED

nacho diz castro
Prodigy 70 points
Part Number: LM5085

Dear Sirs

VCC input of LM5085 its AC-COUPLED

I would like to see an explanation about how it really works (the reason to be ac coupled)

Thank You in Advance :)





  • 0
    TI__Mastermind 25590 points

    Nacho,

    The LM5085 is a PFET controller. The FET will be off when the gate-source voltage is below the turn-on threshold. The FET will be on when the gate-source voltage is above the turn-on threshold. The VCC capacitor is charged to 8V below VIN in order to set the gate to VIN-8V (this moves past the threshold, turning on the FET).

    -Sam