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UCC21541: Driving 10 Gate Driver ICs UCC21541DW in parallel Mode

Andy Fischer
Prodigy 60 points
Part Number: UCC21541

Hi

For an application I want to drive 10 of the UCC21541DW Gate driver ICs in parallel which results in 10 half bridges.

On these half bridges I gonna connect some 230V Induction Motors (like in an inverter Mode).

Whats the best practice for this achievment, especially in terms of the VDD Powersupply, on which I plane to use a TRACO AC/DC Converter (link).

Thank you for the help.

Best regards

Andy Fischer

  • 0
    TI__Expert 3355 points

    Hi,

    Thank you for your question. I work on the applications team in the high power drivers group.

    I recommend reading through the datasheet typical application section which talks about best practices when designing a high-voltage half-bridge. Also, we have some reference designs that our systems engineering team has put together that might be of interest.

    http://www.ti.com/solution/traction-inverter-motor-control

    http://www.ti.com/tool/TIDA-010025

    It’s important to point out that these power supplies are non-isolated, so you should not use them to power the high-side driver (Channel A as seen in the typical application schematic in the datasheet).

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

    Thanks and best regards,

    John

  • 0 in reply to John Geiger
    Prodigy 60 points

    HI

    Thank you for the answer. Which Power SUpply do you mean is non-isolated, the TRACO POWER ? If so, this one should  be isolated (link)

    Well I already read the datasheet and I followed the typical application section, but its never mentioned what to concern if one drives multiple of these ICs.

    *And actually there is also never mentioned what the Gate-Source Resistor (R_GS) requirements should meet.

    Can I simply connect all the VDD together ?

    Best regards

    Andy

  • 0 in reply to Andy Fischer
    TI__Expert 3355 points

    Hi Andy,

    Even if these modules are isolated, I do not see a CMTI (common mode transient immunity) rating. I would suggest following one of our reference designs to create a high-voltage half-bridge circuit, such as http://www.ti.com/tool/TIDA-01159.

    VDD can not all be connected together, because the high-side drivers will have VSS referenced to the switch node.

    A gate to source resistor, Rgs, should be used to pull down the gate to the source voltage when the gate driver output is unpowered and in an indeterminate state.  This resistor also helps to mitigate the risk of dv/dt induced turn-on due to miller current before the gate driver is able to turn on and actively pull low. This resistor is typically sized between 2kΩ and 10kΩ, depending on Vth and Crss of the power device.

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

    Thanks and best regards,

    John

  • 0 in reply to John Geiger
    Prodigy 60 points

    Hi John,

    Thank you for the answer. So does this mean that Im gonna need a high-voltage half-bridge circuit for any of my 10 gate driver ICs UCC21541 ?

    Thank you

    Best regards

    Andy

  • 0 in reply to John Geiger
    Prodigy 60 points

    HI John,

    to clearify what the application actuali is, here my drawing (sorry for the messy schematic, I just made it to point out my purpose).
    The question is now, is it ok to connect them together like this ? (all three on the HV_AuX_12V) ?

    and here the corresponding HV_AUX_12V circuit:

    Thank you

    Best regards,

    Andy

  • 0 in reply to Andy Fischer
    TI__Expert 3355 points

    Hi Andy,

    That looks good now since all of the low-side FETs are referenced  to the same GND and there are individual bootstrap supplies for each high-side FET.

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

    Thanks and best regards,

    John