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UCC5320: Do we have more than 200kV/us CMTI isolated gate driver?

Howard Zou
Genius 12365 points

Part Number: UCC5320

Hi,

my customer is making an inverter circuit, DC bus is 800V, and the SiCFET could turn on or off in 7ns.

They use SI827X whose CMTI typical is 350kV/us, minimum 200kV/us.

UCC5320 typical CMTI is 120kV/us, minimum 100kV/us, which leaves no margin in customer's application.

  • 0
    TI__Intellectual 2805 points

    Hello Howard, 

    I am the applications engineer that supports the UCC5320 family and can help you with your question.

    Can you send me the part number for the SiCFET? Why do they need to switch these FETs so quickly and what inverter application requires this?

    Today, all our isolated gate drivers have a minimum CMTI spec of 100V/ns. 

    regards,
    Mateo

  • 0 in reply to Mateo Begue
    TI__Genius 12365 points

    They only mentioned they use Rohm SiC FET, no specific part number.
    The application is active power filter which is an inverter, and it injects harmonic current into the grid to eliminate the harmonic current(like -1A plus +1A=0A).
    I think it can help decrease the switching loss. Are there any cons for switching so quickly?

  • 0 in reply to Howard Zou
    TI__Intellectual 2805 points
    The reason I asked for the SiC FET part number is to check if they have a max dV/dt specification in V/ns.
    If the FET is only capable of handling a maximum of 100V/ns or less, our parts will be suitable for this application.

    regards,
    Mateo