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UCC15241-Q1: Isolated gate driver design solutions

JEOUN SOO PARK
Prodigy 60 points
Part Number: UCC15241-Q1

Tool/software:

hello

We are currently looking for a gate driver that can switch on 4 SIC mosfets with one PWM. I am currently using UCC5390S which is isolated and each power is also isolated, which I think is very inefficient. But I found a chip like UCC15241 which has isolated DCDC power and integrated gate driver. Is this possible to turn on 4 SIC mosfets simultaneously with one chip and if yes, in which case? If not, can I switch on 2 SIC mosfats simultaneously?

And my question is what is the power required to switch on the SIC mosfets and what is the power of the gate driver?

Thank you.

  • 0
    TI__Mastermind 32975 points

    UCC15241 is a bias supply intended for providing isolated bias power to an isolated gate driver like you are describing and shown in the figure 12-18 below. UCC15241 IS NOT an integrated, isolated gate driver plus bias. You will be using a separate gate driver plus bias supply and once you settle on a desired gate driver IC, you need to determine the amount of bias power required. This is a simple calculation of P=Qg*V*F, where Qg is the total gate charge given in the data sheet of the SiC and if you are driving 2x or 4x SiC's in parallel, you need to multiply the total Qg by 2x or 4x and V is the total VDD-VEE gate drive voltage and F is the SiC switching frequency. Once you know the total power, input voltage and output voltages, ambient temperature you can determine  which bias solution/architecture is best for your application.

    To help with the bias power requirement, please use the UCC15241 Excel Design Tool.

    Regards,

    Steve

  • 0 in reply to Steven Mappus1
    Prodigy 60 points

    Thank you for your response. I have an additional question, we are using one PWM to actuate 4 switches in the following circuit, using a push-pull type. Would it be efficient to use the UCC15241 to power the push-pull circuit (the gate driver uses a different power source) or is there something else you recommend? And since we will be producing very high volumes, it would be nice to be able to run four of them on a single UCC15241. Is this possible? If not, would it be possible to run 2 of them? Is this something that needs to be calculated?

  • 0 in reply to JEOUN SOO PARK
    TI__Mastermind 32975 points

    Please use the UCC15241 Excel Design Tool I referred to previously. Determine how much power you require.

    Steve

  • 0 in reply to Steven Mappus1
    Prodigy 60 points
    Thank you for your answer.