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UCC21550-Q1: quiescent current rating

shankari ramnath
Prodigy 30 points
Part Number: UCC21550-Q1
Other Parts Discussed in Thread: UCC21551

Hi,

I am using this gate driver for an application and to design the power supply I require the quiescent current rating. I see the VDD quiescent current rating on the data sheet of this gate driver, would you be able to provide the same for VEE?

Thanks.

  • 0
    TI__Genius 17486 points

    Hi Shankari,

    The gate driver power supply current is highly dependent on the switching frequency and the capacitor load. In addition, it has a no-load leakage current.

    The current flows into VDD and out of VSS.

    For one channel of the UCC21551, the load current is Qg*f_sw*alpha, where Qg is the gate charge at a given voltage, f_sw is the cycle frequency, and alpha is the probability that the switch turns on and off during an average switching cycle.

    Here is a table for the typical no-load leakage current vs. supply voltage:

    5VCCI    2.47mA

    12VDD   1.083mA

    18VDD   1.13mA

    25VDD   1.25mA

    Best regards,

    Sean