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UCD3138A: IC Max. operating current

MINKYUNG KIM
Expert 1250 points
Part Number: UCD3138A

Hello team,

I'd like to know IC max. operating current of UCD3138A to estimate IC's possible max power consumption.

From the data sheet, I can find total supply current as below.

1. Can 105mA be used as a max. operating current of this device?

2. Can (3.3V * 105mA = 346.5mW) be used as a max. power consumption estimation?

Thank you so much!

  • 0
    TI__Genius 17090 points

    Note that it says that all DPWMs are unloaded.  This is really the operating current for the internal logic.  If you are putting significant loads on the pins, for example driving gate drivers or LEDs with signficant current, your current consumption could be higher.  

  • 0 in reply to Ian Bower
    Expert 1250 points

    Hello Ian,

    Thank you for your answer.

    Then is there any method/equation to calculate operating current with loads? How can I calculate the power consumption of UCD3138A when it's possibly driving gate drivers?

  • 0 in reply to MINKYUNG KIM
    TI__Genius 17090 points

    Our clever automated system closes the thread when you check - this resolves my issue, but then it opens it again when you say thank you.  I think that if I now click on TI thinks resolved it will close the thread again. 

  • 0 in reply to Ian Bower
    Expert 1250 points

    I'm sorry but I cannot get what you meant. You cannot leave an answer on the closed thread? Do you want me to start a new thread for the related question? Or could you please answer on my latest question?

  • 0 in reply to MINKYUNG KIM
    TI__Genius 17090 points

    I actually didn't see the other question - I just saw the thank you.  It is better to put the question on a separate thread, to make it easier for other people to find it, but I'll try to answer it here.  It's really on the same subject.  

    I think it is difficult to have an equation for calculating the energy required for driving the gate drivers.  It depends on things like how often you are putting edges on the gate drivers and what the rise or fall time is for the signal from the UCD, and what the capacitance on the gate drivers is.  Typically with CMOS drivers, the capacitance is the major source of current draw.  If you have a bipolar driver, it could be different.  Note that rise time and capicitance tend to change over temperature, as well as the RDSon of the transistors in both the UCD and the gate driver.  There is also considerable production variation between chips.