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UCC5870QDWJEVM-026: Help with choosing gate driver demonstration board for XM3 SIC modules

JM Holland
Prodigy 230 points

Part Number: UCC5870QDWJEVM-026

Hello,

We are currently evaluating the UCC21710QDWEVM-025. However, I believe the 10A gate drive current is too low for the speeds we intend to switch the rather large capacitance of the XM3 series of modules. 

I stumbled across both the UCC5870-Q1 (15A) and the UCC5870QDWJRQ1 (30A). The demonstration board for the 5870 model, however, is only specified as 15A - half that which is it seems capable of. 

Is there a reason for this? 

We'd like to test the 5870 mostly because we can more easily see the difference between the 21710 model quite easily with 3x higher theoretical peak driving current into the gate capacitance. 

The other is of interest as it is modelled around the XM3 - but it is not clear how this would fit to the module specifically. There seems to be a lack of documentation for some of the driver chips and their respective demonstration boards. 

Do let me know if there is any comment on the above.

Best regards,
JM

  • 0
    TI__Expert 5801 points

    Hello JM,

    Thank you for reaching out!

    IF you look at the recommended operating conditions of the UCC587x family of drivers, 15A is actually the listed output current, though this driver can deliver a much higher instantaneous current, which is why it says 30A. The real limit is actually the power dissipation in the device. This is the discrepancy with the EVM.

    That said, I would strongly recommend looking at UCC5880 instead with this evm: https://www.ti.com/tool/UCC5880QEVM-057

    THis evm connects directly to an XM3 module, and we have actually put together a reference design with Wolfspeed using XM3 modules in a 300kW inverter: https://www.ti.com/tool/TIDM-02014

    The UCC5880 is our most recent device with some added features, a smaller package, and adjustable gate drive. It can easily support a total output current of 20A.

    Let us know if you have follow up questions.

    Regards,

    Daniel