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UCC27201: Quiescent current and Operating current

MINKYUNG KIM
Expert 1250 points
Part Number: UCC27201
Other Parts Discussed in Thread: UCC27282

Hello team,

I'm confused with I_DD and I_DDO.

From my most understading, I_DD is just a standby current when the driver is turned on, but no PWM input. And I_DDO is a operating current when the driver is turned on with PWM input, but no output load (no gate FET connected to HO and LO pins). Could you check if it's correct?

In addition, I'm trying to estimate total current consumption of this device. It's static operating current plus the current required to drive the MOSFET Qg. The later one can be calculated in Igd= Fsw x Qg, but I'm not sure about the former one (static operating current). Which one would be more proper for estimating current consumption, I_DD or I_DDO?

Thanks!  

  • 0
    TI__Guru**** 189399 points

    Hi, Minkyung,

    Your understanding of the first point is correct.

    For the second point, yes, you want to consider the current needed to charge and discharge the gate of your switch as this will dominate the current requirements.

    I suggest you look at one of our newer parts, like UCC27282, which has a very good description of how to calculate this in section 8.2.2 Detailed Design Procedure of the datasheet.

    Good luck with your project!