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UCC21520-Q1: UCC21520

omid hamidi
Intellectual 405 points
Part Number: UCC21520-Q1

HOW CAN CALCULATED HOW MUCH CONTINUSLY CURRENT NEED FOR MOSFET DRIVER 

  • 0
    TI__Expert 3355 points

    Hi Omid,

    Thanks for your interest in UCC21520-Q1. I work on the applications team in the high power drivers group and can help you with your question.

    Average current can be calculated similarly to power draw, calculated in section 9.2.2.4 of the datasheet.

    I(avg) = Fsw * Qg + Iq

    Fsw is your switching frequency.

    Vg is your gate driver voltage, VDD-VSS

    Qg is your total gate charge, determined by the FET you choose

    Iq is your driver quiescent current, determined by looking at figure 4 in the datasheet.

    This calculation will determine how much average current is needed for each channel. This supply should be designed with some margin. CHA and CHB should be designed with proper amount of decoupling capacitance to decouple the VDD supply from the high gate drive current during switching. Please read section 9 of the datasheet to learn more about the typical application design.

    If this helped answer your question, could you please press the green button? If not, feel free to continue asking questions.

    Thanks and best regards,

    John