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LM5050-1: Discharge path of GATE pin at "Forward to Reverse Transition"

K.Yaita
Guru 29690 points
Part Number: LM5050-1

Hi Team,

The datasheet shows the following about tGATE(REV).



However I couldn't catch discharge path of GATE pin at "Forward to Reverse Transition".
Should I consider the discharge path as the following (to IN pin via 2A MOSFET)?


Best Regards,
Yaita / Japan disty

  • 0
    TI__Genius 16305 points
    Hi Yaita,

    Yes that is absolutely correct. When a reverse voltage is detected by the reverse comparator, response time is given by the spec shown above tGATE (rev). The comparator shorts the Gate-Source with a 2A strenght MOSFET internally. The reverse turn off delay can be calculated for external MOSFETs gate capacitance using 2A and the tGATE(rev) spec.


    Regards,
    Kari.
  • 0 in reply to Karikalan Selvaraj
    Guru 29690 points

    Hi Karikalan-san,

    Thank you for your kind support. I understand.

    Is there supply current (IIN, IVS) value at reverse voltage state?
    My customer concern about it because internal +12V charge pump continuously operate although Gate-Source (GATE-IN) is shorted, so he assumes large current flows internally in this case. 

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    Guru 29690 points

    May I have your comments about the following?
    Please let me know if there isn't the data.
    --------------------------------------------
    Is there supply current (IIN, IVS) value at reverse voltage state?
    My customer concern about it because internal +12V charge pump continuously operate although Gate-Source (GATE-IN) is shorted, so he assumes large current flows internally in this case. 
    --------------------------------------------

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    Guru 29690 points

    May I have your comments?
    I will suggest to buy EVM to my customer if there isn't the data.

    Best Regards,
    Yaita