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LM5069: The dv/dt Inrush Control for LM5069

Zhang Liang
Expert 2055 points
Part Number: LM5069

Hi,

We use the LM5069 for the Hot Swap circuit, and we wants to know the detail Calculation formula(Capacitance, Diode, Transistor, Resistor) for the below red frame, thanks.

  • 0
    TI__Guru* 95891 points

    Hi Zhang,

    Thanks for reaching out

    The GATE potential will be at 12.6V above Vin voltage. So, the voltage rating of Cdv/dt should be > (Vin+12.6V) The value of capacitance is decided by the amount of inrush current you want to control. Please use design calculator for that.

    D2: 

    Reverse voltage rating should be > (Vin+12.6V) 

    average current support should be > 22uA. you can select any 100mA type of diode something like 1N4148W-7-F

    Q2:

    voltage rating should be > (Vin+12.6V) 

    Current rating should be in the range of couple of 100mA (prefereably 500mA support) to discharge the Cdv/dt capacitor.

    Best Regards,

    Rakesh