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UCC28064A: UCC28064A ABS Max of GDA and GDB

Part Number: UCC28064A

1.  Regarding ABS Max of GDA and GDB(Continuous input current: ±25mA), does it mean RMS? or average?

2.  What is peak current as ABS Max of GDA and GDB?

  • Hi

    for question 1, ABS Max of GDA and GDB (Continuous input current: ±25mA) refers to a continuous DC current.  In a typical application, where GDA and GDB are connected to the gate of a MOSFET, the current is pulsed rather than a continuous level so the peak drive current for the FET are much higher.  Footnote (5) in the abs max table highlights this.

    For question 2, the specifications for the internal gate driver are on the top of page 7 in the electrical characteristics in the datasheet.  The internal resistance on the pin should prevent the peak gate drive current from exceeding any limit in the IC.  Typically if the gate driver is sourcing or sinking too much current, the thermal limit for the junction (TJ) is exceeded first.

    The main design consideration for the FET gate drive is to insure that it turns on/off fast enough at the worst case slowest time.  The abs max of the resistance on GDA, GDB when they are both low and high allows you to insure that the FET will properly turn off for all designs. 

    Best Regards,

    Eric