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LM5022: How to configure the LM5022 to drive SiC FETs?

Danilo A.
Mastermind 28660 points
Part Number: LM5022
Other Parts Discussed in Thread: PMP22339

Hi Team,

Our customer would like to know how to configure the LM5022 to drive SiC FETs such as C2M1000170J, C2M0280120D and C3M0350120J. I understand that we have SiC FET drivers but can he use LM5022 to drive SiC FET directly? I have checked our reference designs but I can't find one using LM5022.

Here are the specifications from our customer.

Vin = 800VDC

Vout =12V

Iout = 600mA

Regards,

Danilo

  • 0
    TI__Genius 11215 points

    Hello Danilo, 

    Thanks for reaching out. There is a reference design (PMP22339) that is using the LM5022 in SEPIC configuration to drive SiC FETs, here the link to the design: 

    https://www.ti.com/tool/PMP22339?keyMatch=&tisearch=search-everything&usecase=refdesign 

    Let me know if I can help you furthermore. 

    Kind regards, 

    EM 

  • 0 in reply to EM
    TI__Mastermind 28660 points

    Hi EM,

    Thank you very much for sharing this reference design.

    Regards,

    Danilo 

  • 0 in reply to Danilo A.
    TI__Mastermind 28660 points

    Hi EM,

    I have received a follow up inquiry from our customer as follows,

    I was thinking of making the design as cost effective as possible.

    By that maxing the gate drive to 16V only and not using an additional gate driver IC. 

    How would you recommend implementing that in LM5022 whose Max IC voltage is 16V?

    A Linear Regulator to Vcc perhaps to ensure Vcc does not go over max allowable value?

    And since the UVLO is a separate pin with 1.25V nominal value, does it mean feeding that with voltage dividers tied to Bus voltage.

    Also would this require that I string together Vcc and Vin together?

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Genius 11215 points

    Hello Danilo, 

    Thanks for your feedback. An external start-up or other bias rail can be used instead of the internal start-up regulator by connecting the VCC and the VIN pins together and feeding the external bias voltage (7.5 V to 14 V) to the two pins, but anyway your VCC regulator will regulate at 7V typ. (see page 5, table 6.5 Electrical characteristics), therefore I would say you will still need the external driver for your SiC FET. 

    Kind regards, 

    EM