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Original question:

Creepage distance >15mm driver device for IGBT

UCC5350-Q1: About DWL packege

Damith Warahenage
Prodigy 70 points
Other Parts Discussed in Thread: UCC5350

Tool/software:

Hi

I have seen in an another thread that this particular gate driver will have a DWL package version soon. But this was 5 months ago. 
Can i please know the timescale for this. 

I need a gate driver with 15mm creepage/ clearance values. But it seems like there is nothing in the market at the moment. 

Regards
Damith

  • 0
    TI__Mastermind 23196 points

    Hi Damith,

    Unfortunately, this is a custom made device that does not currently have a plan for release to the wider market. Might I ask what you are building that requires this creepage and clearance? 

    You can try cutting a slot into the board under the device to increase the creepage for the DWV devices. The other work-around is conformal coating, which can increase the dielectric constant.

    Best regards,

    Sean

  • 0 in reply to Sean Cashin
    Prodigy 70 points

    Hi Sean

    It is needed for an HV application. Regulations for this particular application state the creepage and clearance requirements more than 15mm.
    We can get away with creepage but the problem is clearance. There is no way around it.  

    One of your team stated in another thread that this will be released soon though. 

    Regards

    Damith

  • 0 in reply to Damith Warahenage
    TI__Mastermind 23196 points

    If they do release it, it will not be until Q2 of 2025. The issue is that the bond wires are so long that it starts to have inductive kickback that might damage the output stages of existing designs if used for a very narrow pulse, with high dI/dt. There is a concern that this will lead to returns if the device is released to the "mass market". We are defining a new driver to update UCC5350 that might have a DWL package, but it hasn't been designed yet.

    What are the rules on putting two isolation devices in series? Does that count as increasing the clearance?

    Best regards,

    Sean

  • 0 in reply to Sean Cashin
    Prodigy 70 points


    Thanks for the clarification. 
    Yes, that's one way to do it. But the problem is then i will have to use series power supplies too, which will increase the costs and become very bulky. 

  • 0 in reply to Damith Warahenage
    TI__Mastermind 23196 points

    You could use a digital isolator and a gate driver in series. Maybe you could use a flyback transformer with multiple outputs. Check back in Q2 2025, we might have a DWL gate driver that gets released to the general market.

    Best regards,

    Sean