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LM5101ASD current consumption

Willem Jongsma
Prodigy 30 points
Other Parts Discussed in Thread: LM5101

Is there a way to determine the maximum current consumption of the LM5101ASD/NOPB without measuring it?

  • 0
    TI__Expert 5900 points

    Hi Willem,

    Usually you should guarantee that the junction temperature of LM5101 not exceed the spec.

    So, what is your application and what is your concern?

    Regards

  • 0 in reply to Kening Gao
    Prodigy 30 points

    My application is a BLDC motor driver bridge.

    I need this information to determine the 12V power requirements on my PCB.

    The LM5101ASD HO and LO pins are each connected to one IRF6668 gate by a 10ohm resistor.

    A 1uF bootstrap capacitor will be used.

  • 0 in reply to Willem Jongsma
    TI__Expert 5900 points

    Hi Willem,

    In the spec , there is a VDD operating current in page 4, whose maximum value is 3mA at 500khz, 12V VDD , no load.

    So if they are driving the IRF6668, you can calculate the driving loss by Qg ,frequency, VDD. 

    Then , you could sum the two power, then you get it.

    From my experience, design a bias to power 100mA is enough for the driver.

    Regards